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Immediate effects of active exercise with compression therapy on lower-limb lymphedema

Identifieur interne : 000E71 ( Pmc/Corpus ); précédent : 000E70; suivant : 000E72

Immediate effects of active exercise with compression therapy on lower-limb lymphedema

Auteurs : Takuya Fukushima ; Tetsuya Tsuji ; Yufuko Sano ; Chieko Miyata ; Michiyo Kamisako ; Hiroka Hohri ; Chikako Yoshimura ; Megumi Asakura ; Taro Okitsu ; Kaori Muraoka ; Meigen Liu

Source :

RBID : PMC:5486768

Abstract

Purpose

Active exercise with compression therapy (AECT) is a standard treatment for gynecological cancer-related lower-limb lymphedema (LLL) in clinical situations. However, there is insufficient evidence regarding the immediate effects of the use of AECT on LLL. The purpose of this study was to evaluate the immediate effects of AECT on LLL.

Methods

Participants in this randomized controlled crossover trial comprised 23 women with LLL who completed high-load AECT, low-load AECT, and compression-only therapy (CT). AECT was performed on a bicycle ergometer with short stretch bandages. Each intervention was performed for 15 min, with successive interventions separated by a 1-week washout period. Lower-limb volume was assessed using a Perometer™ sensor (Pero-system, Wuppertal, Germany). General symptoms (pain and heaviness) and skin symptoms (pitting and stiffness) were assessed using a visual analog scale and palpation, respectively. Measurements were taken before and after each intervention. Analysis of variance using linear mixed-effect modeling was used for statistical analyses.

Results

Volume decrement differed significantly between all three interventions (P < 0.05). Lower-limb volume was significantly reduced after high-load AECT compared to that after CT. General symptoms and skin symptoms were similar across the three interventions, but severity of pre-intervention skin symptoms correlated significantly with volume decrement after high- and low-load AECT. High-load AECT using the bicycle ergometer was more effective than CT for decreasing lower-limb volume.

Conclusions

These results suggest that high-load AECT has marked effects on severe LLL.


Url:
DOI: 10.1007/s00520-017-3671-2
PubMed: 28386788
PubMed Central: 5486768

Links to Exploration step

PMC:5486768

Le document en format XML

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<title>Purpose</title>
<p id="Par1">Active exercise with compression therapy (AECT) is a standard treatment for gynecological cancer-related lower-limb lymphedema (LLL) in clinical situations. However, there is insufficient evidence regarding the immediate effects of the use of AECT on LLL. The purpose of this study was to evaluate the immediate effects of AECT on LLL.</p>
</sec>
<sec>
<title>Methods</title>
<p id="Par2">Participants in this randomized controlled crossover trial comprised 23 women with LLL who completed high-load AECT, low-load AECT, and compression-only therapy (CT). AECT was performed on a bicycle ergometer with short stretch bandages. Each intervention was performed for 15 min, with successive interventions separated by a 1-week washout period. Lower-limb volume was assessed using a Perometer™ sensor (Pero-system, Wuppertal, Germany). General symptoms (pain and heaviness) and skin symptoms (pitting and stiffness) were assessed using a visual analog scale and palpation, respectively. Measurements were taken before and after each intervention. Analysis of variance using linear mixed-effect modeling was used for statistical analyses.</p>
</sec>
<sec>
<title>Results</title>
<p id="Par3">Volume decrement differed significantly between all three interventions (
<italic>P</italic>
 < 0.05). Lower-limb volume was significantly reduced after high-load AECT compared to that after CT. General symptoms and skin symptoms were similar across the three interventions, but severity of pre-intervention skin symptoms correlated significantly with volume decrement after high- and low-load AECT. High-load AECT using the bicycle ergometer was more effective than CT for decreasing lower-limb volume.</p>
</sec>
<sec>
<title>Conclusions</title>
<p id="Par4">These results suggest that high-load AECT has marked effects on severe LLL.</p>
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</TEI>
<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Support Care Cancer</journal-id>
<journal-id journal-id-type="iso-abbrev">Support Care Cancer</journal-id>
<journal-title-group>
<journal-title>Supportive Care in Cancer</journal-title>
</journal-title-group>
<issn pub-type="ppub">0941-4355</issn>
<issn pub-type="epub">1433-7339</issn>
<publisher>
<publisher-name>Springer Berlin Heidelberg</publisher-name>
<publisher-loc>Berlin/Heidelberg</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">28386788</article-id>
<article-id pub-id-type="pmc">5486768</article-id>
<article-id pub-id-type="publisher-id">3671</article-id>
<article-id pub-id-type="doi">10.1007/s00520-017-3671-2</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Original Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Immediate effects of active exercise with compression therapy on lower-limb lymphedema</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Fukushima</surname>
<given-names>Takuya</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author" corresp="yes">
<contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-4728-9409</contrib-id>
<name>
<surname>Tsuji</surname>
<given-names>Tetsuya</given-names>
</name>
<address>
<phone>81-3-5363-3833</phone>
<email>cxa01423@nifty.com</email>
</address>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Sano</surname>
<given-names>Yufuko</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Miyata</surname>
<given-names>Chieko</given-names>
</name>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Kamisako</surname>
<given-names>Michiyo</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Hohri</surname>
<given-names>Hiroka</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Yoshimura</surname>
<given-names>Chikako</given-names>
</name>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Asakura</surname>
<given-names>Megumi</given-names>
</name>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Okitsu</surname>
<given-names>Taro</given-names>
</name>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Muraoka</surname>
<given-names>Kaori</given-names>
</name>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Liu</surname>
<given-names>Meigen</given-names>
</name>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<aff id="Aff1">
<label>1</label>
<institution-wrap>
<institution-id institution-id-type="ISNI">0000 0004 0616 1585</institution-id>
<institution-id institution-id-type="GRID">grid.411873.8</institution-id>
<institution>Department of Rehabilitation Medicine,</institution>
<institution>Nagasaki University Hospital,</institution>
</institution-wrap>
Nagasaki, Japan</aff>
<aff id="Aff2">
<label>2</label>
<institution-wrap>
<institution-id institution-id-type="ISNI">0000 0000 8902 2273</institution-id>
<institution-id institution-id-type="GRID">grid.174567.6</institution-id>
<institution>Department of Locomotive Rehabilitation Science, Unit of Rehabilitation Sciences,</institution>
<institution>Nagasaki University Graduate School of Biomedical Sciences,</institution>
</institution-wrap>
Nagasaki, Japan</aff>
<aff id="Aff3">
<label>3</label>
<institution-wrap>
<institution-id institution-id-type="ISNI">0000 0004 1936 9959</institution-id>
<institution-id institution-id-type="GRID">grid.26091.3c</institution-id>
<institution>Department of Rehabilitation Medicine,</institution>
<institution>Keio University School of Medicine,</institution>
</institution-wrap>
Tokyo, Japan</aff>
<aff id="Aff4">
<label>4</label>
<institution-wrap>
<institution-id institution-id-type="ISNI">0000 0001 0633 2119</institution-id>
<institution-id institution-id-type="GRID">grid.412096.8</institution-id>
<institution>Department of Rehabilitation Medicine,</institution>
<institution>Keio University Hospital,</institution>
</institution-wrap>
Tokyo, Japan</aff>
</contrib-group>
<pub-date pub-type="epub">
<day>6</day>
<month>4</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="pmc-release">
<day>6</day>
<month>4</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="ppub">
<year>2017</year>
</pub-date>
<volume>25</volume>
<issue>8</issue>
<fpage>2603</fpage>
<lpage>2610</lpage>
<history>
<date date-type="received">
<day>13</day>
<month>10</month>
<year>2016</year>
</date>
<date date-type="accepted">
<day>14</day>
<month>3</month>
<year>2017</year>
</date>
</history>
<permissions>
<copyright-statement>© The Author(s) 2017</copyright-statement>
<license license-type="OpenAccess">
<license-p>
<bold>Open Access</bold>
This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.</license-p>
</license>
</permissions>
<abstract id="Abs1">
<sec>
<title>Purpose</title>
<p id="Par1">Active exercise with compression therapy (AECT) is a standard treatment for gynecological cancer-related lower-limb lymphedema (LLL) in clinical situations. However, there is insufficient evidence regarding the immediate effects of the use of AECT on LLL. The purpose of this study was to evaluate the immediate effects of AECT on LLL.</p>
</sec>
<sec>
<title>Methods</title>
<p id="Par2">Participants in this randomized controlled crossover trial comprised 23 women with LLL who completed high-load AECT, low-load AECT, and compression-only therapy (CT). AECT was performed on a bicycle ergometer with short stretch bandages. Each intervention was performed for 15 min, with successive interventions separated by a 1-week washout period. Lower-limb volume was assessed using a Perometer™ sensor (Pero-system, Wuppertal, Germany). General symptoms (pain and heaviness) and skin symptoms (pitting and stiffness) were assessed using a visual analog scale and palpation, respectively. Measurements were taken before and after each intervention. Analysis of variance using linear mixed-effect modeling was used for statistical analyses.</p>
</sec>
<sec>
<title>Results</title>
<p id="Par3">Volume decrement differed significantly between all three interventions (
<italic>P</italic>
 < 0.05). Lower-limb volume was significantly reduced after high-load AECT compared to that after CT. General symptoms and skin symptoms were similar across the three interventions, but severity of pre-intervention skin symptoms correlated significantly with volume decrement after high- and low-load AECT. High-load AECT using the bicycle ergometer was more effective than CT for decreasing lower-limb volume.</p>
</sec>
<sec>
<title>Conclusions</title>
<p id="Par4">These results suggest that high-load AECT has marked effects on severe LLL.</p>
</sec>
</abstract>
<kwd-group xml:lang="en">
<title>Keywords</title>
<kwd>Gynecological cancer</kwd>
<kwd>Lymphatic system insufficiency</kwd>
<kwd>Rehabilitation</kwd>
<kwd>Ergometer exercise</kwd>
</kwd-group>
<funding-group>
<award-group>
<funding-source>
<institution>JSPS KAKENHI</institution>
</funding-source>
<award-id>26350586</award-id>
<principal-award-recipient>
<name>
<surname>Tsuji</surname>
<given-names>Tetsuya</given-names>
</name>
</principal-award-recipient>
</award-group>
<award-group>
<funding-source>
<institution>AMED Practical Research for Innovative Cancer Control Grant</institution>
</funding-source>
<award-id>16ck0106215</award-id>
<principal-award-recipient>
<name>
<surname>Tsuji</surname>
<given-names>Tetsuya</given-names>
</name>
</principal-award-recipient>
</award-group>
</funding-group>
<custom-meta-group>
<custom-meta>
<meta-name>issue-copyright-statement</meta-name>
<meta-value>© Springer-Verlag GmbH Germany 2017</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body>
<sec id="Sec1">
<title>Introduction</title>
<p id="Par5">Lymphedema is a progressive chronic condition characterized by accumulation of fluid in the tissue spaces resulting from lymphatic system insufficiency and deranged lymph transport [
<xref ref-type="bibr" rid="CR1">1</xref>
]. A prevalence of 20–27.2% has been reported for secondary lower-limb lymphedema (LLL) in patients who have undergone radical interventions, including pelvic lymph node dissection, radiation therapy, and/or chemotherapy, for gynecological cancer [
<xref ref-type="bibr" rid="CR2">2</xref>
–
<xref ref-type="bibr" rid="CR4">4</xref>
]. LLL has negative impacts on house work [
<xref ref-type="bibr" rid="CR5">5</xref>
], physical activity [
<xref ref-type="bibr" rid="CR5">5</xref>
,
<xref ref-type="bibr" rid="CR6">6</xref>
], mobility [
<xref ref-type="bibr" rid="CR6">6</xref>
,
<xref ref-type="bibr" rid="CR7">7</xref>
], social activities [
<xref ref-type="bibr" rid="CR5">5</xref>
,
<xref ref-type="bibr" rid="CR7">7</xref>
,
<xref ref-type="bibr" rid="CR8">8</xref>
], and psychological well-being [
<xref ref-type="bibr" rid="CR7">7</xref>
]. If patients with LLL are not properly managed, the LLL will become progressively worse, causing disability in activities of daily living (ADL) [
<xref ref-type="bibr" rid="CR5">5</xref>
,
<xref ref-type="bibr" rid="CR7">7</xref>
] and declines in quality of life [
<xref ref-type="bibr" rid="CR5">5</xref>
,
<xref ref-type="bibr" rid="CR7">7</xref>
–
<xref ref-type="bibr" rid="CR9">9</xref>
]. Prevention, early diagnosis, and early treatment are thus crucial in the management of lymphedema.</p>
<p id="Par6">Complex decongestive physiotherapy (CDP) is widely carried out in the clinical setting as a standard treatment and generally involves a two-stage treatment program that comprises intensive and supportive phases [
<xref ref-type="bibr" rid="CR1">1</xref>
]. The first, intensive phase consists of skin care, manual lymph drainage (MLD), multi-layered compression bandaging, and exercise with compression. The second, supportive phase consists of skin care, self-MLD, compression by an elastic garment, and continued exercise with compression to conserve the results obtained in the first phase.</p>
<p id="Par7">Several studies have examined the effects of active exercise with compression therapy (AECT) on upper-limb lymphedema (ULL). Gautam et al. showed the effects of an 8-week home exercise program comprising resistance training and stretching on decrements in limb volume [
<xref ref-type="bibr" rid="CR10">10</xref>
]. Kim et al. also reported volume decrements with an 8-week intervention that added resistance training to CDP [
<xref ref-type="bibr" rid="CR11">11</xref>
]. Furthermore, Jeffs et al. revealed the effects of 26-week home-based resistance training on volume decrements [
<xref ref-type="bibr" rid="CR12">12</xref>
]. Concerning immediate results, the effects of AECT comprising four 12-min sessions of exercise on lymphedema related to breast cancer [
<xref ref-type="bibr" rid="CR13">13</xref>
] and of gentle arm exercise on ULL [
<xref ref-type="bibr" rid="CR14">14</xref>
] have been reported. Consequently, long- and short-term AECTs are beneficial to ULL in terms of volume decrement.</p>
<p id="Par8">On the other hand, while Katz et al. showed the feasibility of resistance training, no reports have described the long- and short-term effects of AECT on LLL [
<xref ref-type="bibr" rid="CR15">15</xref>
]. We therefore focused on the immediate effects of AECT and tried to clarify appropriate modalities such as exercise intensity, timing, and type.</p>
<p id="Par9">The purpose of this study was to evaluate the immediate effects of AECT performed using a bicycle ergometer on LLL.</p>
</sec>
<sec id="Sec2">
<title>Methods</title>
<sec id="Sec3">
<title>Study design</title>
<p id="Par10">This was a randomized controlled crossover trial to evaluate the immediate effects of AECT performed on a bicycle ergometer with short stretch bandages on LLL. Participants completed high-load AECT, low-load AECT, and compression-only therapy (CT) in a randomized order, with the timing of the first intervention defined as period 1, the second one as period 2, and third one as period 3. Six patterns of intervention order were applied, with randomization in blocks of six using computer-based random number tables to eliminate any effects of order. Each intervention was performed for 15 min, and the three interventions were each separated by a 1-week washout period to eliminate any carryover effects [
<xref ref-type="bibr" rid="CR14">14</xref>
]. Measurements were taken before and after each intervention (Fig.
<xref rid="Fig1" ref-type="fig">1</xref>
).
<fig id="Fig1">
<label>Fig. 1</label>
<caption>
<p>Study design: the randomized controlled crossover trial. Each intervention was performed for 15 min, and the three interventions were separated by a 1-week washout period to eliminate any carryover effects. Measurements were taken before and after each intervention. Six patterns of intervention order were applied, with randomization in blocks of six using computer-based random number tables to eliminate order effects</p>
</caption>
<graphic xlink:href="520_2017_3671_Fig1_HTML" id="MO1"></graphic>
</fig>
</p>
<p id="Par11">The study protocol was approved by the ethics committee at Keio University Hospital.</p>
</sec>
<sec id="Sec4">
<title>Participants</title>
<p id="Par12">Patients who had been diagnosed with secondary lymphedema were screened for eligibility and recruited by rehabilitation physicians from cancer rehabilitation or lymphedema outpatient clinics at Keio University Hospital. Informed consent was obtained from all individual participants included in the study prior to enrolment. Inclusion criteria included (1) diagnosis with gynecological cancer (stages I–IV), (2) history of treatment for gynecologic cancer, (3) age 20–80 years, and (4) ability to perform exercise on a bicycle ergometer. Exclusion criteria were (1) difficulty with communicating, (2) cellulitis, (3) leakage of lymphatic fluid, (4) deep venous thrombosis, (5) severe aneurysm, (6) severe heart disease, or (7) pulmonary embolism.</p>
<p id="Par13">Sample size was calculated using sample size calculation software (G*Power version 3.1.9.2 for Windows;
<ext-link ext-link-type="uri" xlink:href="http://www.gpower.hhu.de">http://www.gpower.hhu.de</ext-link>
). The sample size was based on the change in lymphedema as indicated by volume [
<xref ref-type="bibr" rid="CR13">13</xref>
]. With effect size calculated from mean and standard deviation, the statistical power and statistical level of significance for the study were set at 0.8, and 0.05, respectively, and the sample size for each group was calculated as 13. However, the effect size in this study seemed smaller than in the previous study, because the intervention time was shorter. In consideration of this and a potential 10% loss to follow-up, we sought to recruit 20 patients with lymphedema to provide adequate power.</p>
</sec>
<sec id="Sec5">
<title>Outcome assessments</title>
<p id="Par14">Age, body mass index (BMI), cancer type, treatment, and lymphedema staging according to the International Society of Lymphology (ISL) were collected from medical records. ISL stages were defined as follows: stage I, accumulation of tissue fluid that subsides with limb elevation; stage II, limb elevation alone rarely reduces swelling and pitting is manifest; late stage II, may or may not be pitting, as tissue fibrosis is more evident; or stage III, tissue is hard and pitting is absent, with skin changes such as thickening, hyperpigmentation, increased skin folds, fat deposits, and warty overgrowths. Lower-limb volume, general symptoms, and skin symptoms were evaluated pre- and immediately post-intervention without bandaging in each intervention.</p>
<sec id="Sec6">
<title>Lower-limb volume</title>
<p id="Par15">Lower-limb volume was measured using the Perometer-type 1000M™ sensor (Pero-system, Wuppertal, Germany), following the protocol of Jeffs et al. [
<xref ref-type="bibr" rid="CR12">12</xref>
]. The Perometer uses infrared light to scan images of the limb. For measurement, the patient stands with one limb inside and the other outside the frame. Infrared light transmitters located on two sides of the frame project light towards photo sensors on the opposing two sites, and the limb effectively blocks transmission of the light from one side of the frame to the other, creating an electronic image. As the frame is moved along the limb, a series of images is recorded every 0.5 cm, creating limb size and volume [
<xref ref-type="bibr" rid="CR16">16</xref>
].</p>
<p id="Par16">Measurement was performed twice and mean volume was calculated. When a difference of more than 10% was seen between the measurements, another measurement was made. After the measurement, data were uploaded to a personal computer (Lets-note™; Panasonic, Windows Vista Business, Osaka, Japan) and lower-limb volume was calculated using the PeroPlus™ software (JUZO, Cuyahoga Falls, OH).</p>
</sec>
<sec id="Sec7">
<title>General symptoms: pain and heaviness</title>
<p id="Par17">Pain and heaviness were measured using a visual analog scale (VAS). On a 100-mm horizontal line, the scale was anchored by “no pain” (score 0) and “worst imaginable pain” (score 100) for pain and “no heaviness” (score 0) and “worst imaginable heaviness” (score 100) for heaviness [
<xref ref-type="bibr" rid="CR17">17</xref>
].</p>
</sec>
<sec id="Sec8">
<title>Skin symptoms: skin stiffness and pitting edema</title>
<p id="Par18">Skin stiffness was evaluated by palpation, or pinching the skin, at four levels, defined as follows: 0, soft; 1, slightly hard; 2, moderately hard; or 3, severely hard or fibrosis. Pitting edema was evaluated at three levels by palpation, pressing on the skin for 5 s, defined as follows: 0, pitting absent; 1, pitting present for ≤5 s; and 2, pitting present for >5 s. The same physical therapist who had already received lymphedema therapist training in Japan performed the palpation. Measurements were made at medial sites 10 cm proximal to the knee (AK10) and 10 cm distal to the knee (BK10) and on the dorsal aspect of the foot. Total scores for the three sites were adopted for measurements.</p>
</sec>
<sec id="Sec9">
<title>Maximum muscular strength of the lower limb</title>
<p id="Par19">Prior to the first intervention, maximum muscular strength of the lower limb was measured using the isokinetic mode of a Strength Ergo™240 bicycle ergometer (Mitsubishi Electric Engineering, Tokyo, Japan). Maximum muscular strength of the lower limb was defined as the maximal peak torque, pedaling at a rate of 50 rpm. Measurements were performed twice, taking the higher value for analysis.</p>
</sec>
</sec>
<sec id="Sec10">
<title>Interventions</title>
<p id="Par20">All participants took part in the three interventions, comprising high-load AECT, low-load AECT, and CT in a rehabilitation room at Keio University Hospital.</p>
<p id="Par21">In high- and low-load AECT, multi-layered compression bandaging was performed with the patient in a supine position. A foam padding bandage (Artiflex®; BSN Medical, Rue Guillaume, Luxembourg) on a cotton tube stockinette (Tricofix®; BSN Medical) was wrapped around the lower limb. Next, six short stretch bandages (Comprilan®; BSN Medical) were sequentially wrapped around the limb with the first bandage starting at the foot, the second two bandages starting at the calf, the third bandage starting just below the knee, the fourth bandage starting at the thigh, and the fifth and sixth bandages covering the whole limb.</p>
<p id="Par22">All bandaging was performed by the same physical therapist, who had already received lymphedema therapist training in Japan, so that sub-bandage pressure at the calf was maintained around 40 mmHg using the Kikuhime™ pressure sensor (TT Meditrade, Sorø, Denmark), which can measure the sub-bandage pressure of bandages.</p>
<p id="Par23">Active exercise was then performed using the training mode of the Strength Ergo™240 bicycle ergometer. Exercise intensity was set at 10% of the maximum extension muscular strength of the lower limb as evaluated at baseline for high-load AECT and 5% for low-load AECT. Anaerobic threshold (AT) is one of the indices of exercise intensity, and energy supply is provided by aerobic mechanisms at less than AT. A previous study using the Strength Ergo™240 bicycle ergometer showed that muscular extension strength of the lower limb required in AT was approximately 12% of the maximum extension muscular strength of the lower limb [
<xref ref-type="bibr" rid="CR18">18</xref>
]. Exercise intensities were thus set at 10 and 5% of the maximum extension muscular strength of the lower limb (i.e., less than AT) so that all participants would be able to perform the exercise. The position of the seat was adjusted according to height and sitting height, so that activity of the gluteal muscles did not exceed that of the lower limbs. Participants were instructed to pedal the ergometer at 50 revolutions/min for 15 min [
<xref ref-type="bibr" rid="CR17">17</xref>
]. Exercise duration varied from 15 to 60 min in previous studies [
<xref ref-type="bibr" rid="CR12">12</xref>
,
<xref ref-type="bibr" rid="CR19">19</xref>
,
<xref ref-type="bibr" rid="CR20">20</xref>
]. As patients with LLL may not be able to continue exercise for that long, the duration of exercise was set at 15 min in the present study.</p>
<p id="Par24">During CT, participants were instructed to maintain a sitting position for 15 min.</p>
</sec>
<sec id="Sec11">
<title>Statistical analyses</title>
<p id="Par25">The Wilcoxon signed-rank test was used to analyze pre- and post-intervention changes in lower-limb volume, general symptoms, and skin symptoms. Analysis of variance using linear mixed-effect modeling was used to compare the effects of three interventions (high-load AECT, low-load AECT, and CT) and time (periods 1, 2, and 3). Least square mean (LSM) changes in lower-limb volume and percentage changes in VAS scores for general symptoms (pain and heaviness) and skin symptoms (skin stiffness and pitting edema) were used to gauge effects of the intervention. Spearman’s rank correlation was used to compare the severity of pre-intervention skin symptoms (skin stiffness and pitting edema) with decrements in lower-limb volume.</p>
<p id="Par26">Values of
<italic>P</italic>
 < 0.05 were considered statistically significant. Data were analyzed using the Statistics version 19 software (IBM SPSS, Chicago, IL).</p>
</sec>
</sec>
<sec id="Sec12">
<title>Results</title>
<p id="Par27">We enrolled 23 patients (25 limbs), of whom 22 patients (23 limbs) completed the intervention and evaluation. Two patients chose to drop out of the study before completion.</p>
<p id="Par28">Mean age was 60.9 ± 8.3 years and mean BMI was 22.8 ± 3.7 kg/m
<sup>2</sup>
. The underlying pathology was endometrial cancer in ten patients (45.4%), ovarian cancer in eight patients (36.4%), and cervical cancer in four patients (18.2%). All participants underwent surgery and half received chemotherapy. Lymphedema staging was performed according to the International Society of Lymphology (ISL) criteria, with stage II in 18 patients (78.3%) and late stage II in 5 patients (21.7%).</p>
<sec id="Sec13">
<title>Lower-limb volume</title>
<p id="Par29">Significant reductions in lower-limb volume were seen for all interventions from pre- to post-intervention (high-load AECT,
<italic>P =</italic>
 0.02; low-load AECT,
<italic>P = <</italic>
0.01; CT,
<italic>P = <</italic>
0.01).</p>
<p id="Par30">LSM changes in lower-limb volume differed significantly among the three interventions (
<italic>P =</italic>
 0.04), and LSM changes in lower-limb volume were significantly higher with high-load AECT than with CT (
<italic>P =</italic>
 0.02) (Table
<xref rid="Tab1" ref-type="table">1</xref>
). Although LSM changes in lower-limb volume were significantly higher for period 1 than for period 2 (
<italic>P =</italic>
 0.04) and period 3 (
<italic>P <</italic>
 0.01), no significant interactions were seen between intervention and period (
<italic>P =</italic>
 0.79).
<table-wrap id="Tab1">
<label>Table 1</label>
<caption>
<p>Mean changes in least square mean (LSM) from pre-intervention to post-intervention for lower-limb volume and general and skin symptoms</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th rowspan="2">Outcomes</th>
<th colspan="3">Mean change (95%CI)</th>
<th colspan="4">
<italic>P</italic>
</th>
</tr>
<tr>
<th>High-load AECT</th>
<th>Low-load AECT</th>
<th>CT</th>
<th>P1</th>
<th>P2</th>
<th>P3</th>
<th>Overall
<italic>P</italic>
</th>
</tr>
</thead>
<tbody>
<tr>
<td>Lower-limb volume</td>
<td>62.5 ± 15.3 (31.7–93.3)</td>
<td>50.0 ± 15.2 (19.5–80.6)</td>
<td>18.5 ± 15.0 (−11.6–48.6)</td>
<td>0.02</td>
<td>0.08</td>
<td>0.48</td>
<td>0.042</td>
</tr>
<tr>
<td>Pain</td>
<td>32.8 ± 8.9 (15.0–50.6)</td>
<td>24.1 ± 8.9 (6.4–41.7)</td>
<td>12.0 ± 8.6 (−5.4–29.2)</td>
<td>0.09</td>
<td>0.31</td>
<td>0.47</td>
<td>0.22</td>
</tr>
<tr>
<td>Heaviness</td>
<td>47.2 ± 7.8 (34.2–65.6)</td>
<td>43.4 ± 7.7 (27.9–60.0)</td>
<td>33.5 ± 7.6 (18.2–48.9)</td>
<td>0.06</td>
<td>0.24</td>
<td>0.44</td>
<td>0.15</td>
</tr>
<tr>
<td>Skin stiffness</td>
<td>2.1 ± 1.4 (−0.7–4.9)</td>
<td>0.0 ± 1.4 (−2.8–2.8)</td>
<td>0.0 ± 1.4 (−2.7–2.7)</td>
<td>0.29</td>
<td>1.00</td>
<td>0.29</td>
<td>0.47</td>
</tr>
<tr>
<td>Pitting</td>
<td>4.4 ± 2.3 (−0.2–9.1)</td>
<td>3.7 ± 2.3 (−0.9–8.3)</td>
<td>5.5 ± 2.3 (1.0–10.0)</td>
<td>0.72</td>
<td>0.56</td>
<td>0.82</td>
<td>0.84</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>Mean changes in LSM were estimated on the basis of analyses of variance using linear mixed-effect modeling. LSM changes of lower-limb volume and percentage changes in general symptoms including pain and heaviness and skin symptoms including skin stiffness and pitting edema were calculated as effects of intervention</p>
<p>
<italic>P1</italic>
high-load AECT versus CT,
<italic>P2</italic>
low-load AECT versus CT,
<italic>P3</italic>
high-load AECT versus low-load AECT,
<italic>High-load AECT</italic>
bicycle ergometer with compression therapy, with intensity set at 10% of maximum extension muscular strength of the lower limb,
<italic>Low-load AECT</italic>
bicycle ergometer with compression therapy, with intensity set at 5% of maximum extension muscular strength of the lower limb,
<italic>CT</italic>
compression-only therapy,
<italic>LSM</italic>
least square mean,
<italic>CI</italic>
confidence interval.
<italic>AECT</italic>
active exercise with compression therapy,
<italic>CT</italic>
compression-only therapy</p>
</table-wrap-foot>
</table-wrap>
</p>
</sec>
<sec id="Sec14">
<title>General symptoms: pain and heaviness</title>
<p id="Par31">Significant improvements were seen in pain (high-load AECT,
<italic>P <</italic>
 0.01; low-load AECT,
<italic>P</italic>
 = 0.01; CT,
<italic>P <</italic>
 0.05) and heaviness (high-load AECT,
<italic>P <</italic>
 0.01; low-load AECT,
<italic>P <</italic>
 0.01; CT,
<italic>P <</italic>
 0.01) with all interventions from pre- to post-intervention.</p>
<p id="Par32">No significant differences existed in LSM percentage changes in pain and heaviness between the three interventions (
<italic>P =</italic>
 0.22 and
<italic>P =</italic>
 0.15) (Table
<xref rid="Tab1" ref-type="table">1</xref>
) and periods (
<italic>P =</italic>
 0.82 and
<italic>P =</italic>
 0.23).</p>
</sec>
<sec id="Sec15">
<title>Skin symptoms: skin stiffness and pitting edema</title>
<p id="Par33">Although no significant improvement of skin stiffness (high-load AECT,
<italic>P</italic>
 = 0.16; low-load AECT,
<italic>P</italic>
 = 1.00; and CT,
<italic>P</italic>
 = 1.00) was seen with any interventions from pre- to post-intervention, a significant difference in pitting edema (high-load AECT,
<italic>P</italic>
 = 0.03; low-load AECT,
<italic>P <</italic>
 0.05; CT,
<italic>P</italic>
 = 0.03) was observed with all interventions.</p>
<p id="Par34">No significant differences in LSM percentage change in skin stiffness or pitting between the three interventions (
<italic>P =</italic>
 0.47 and
<italic>P =</italic>
 0.84) (Table
<xref rid="Tab1" ref-type="table">1</xref>
) and periods (
<italic>P =</italic>
 0.47 and
<italic>P =</italic>
 0.42) were observed.</p>
<p id="Par35">Figure
<xref rid="Fig2" ref-type="fig">2</xref>
shows that the severity of pre-intervention skin stiffness correlated significantly with changes in lower-limb volume with high-load (
<italic>r</italic>
 = 0.66,
<italic>P <</italic>
 0.01) and low-load AECT (
<italic>r</italic>
 = 0.53,
<italic>P <</italic>
 0.01), but not with CT (
<italic>r</italic>
 = −0.04,
<italic>P =</italic>
 0.86), while severity of pre-intervention pitting correlated significantly with changes in lower-limb volume under high-load (
<italic>r</italic>
 = 0.47,
<italic>P =</italic>
 0.02) and low-load AECT (
<italic>r</italic>
 = 0.45,
<italic>P =</italic>
 0.03), but not under CT (
<italic>r</italic>
 = −0.31,
<italic>P =</italic>
 0.15).
<fig id="Fig2">
<label>Fig. 2</label>
<caption>
<p>Correlations between severity of pre-intervention skin symptoms and changes in lower-limb volume. Severity of pre-intervention skin stiffness correlated significantly with changes in lower-limb volume for high-load (
<bold>a</bold>
) (
<italic>r</italic>
 = 0.66,
<italic>P <</italic>
 0.01) and low-load AECT (
<bold>b</bold>
) (
<italic>r</italic>
 = 0.53,
<italic>P <</italic>
 0.01), but not for CT (
<bold>c</bold>
) (
<italic>r</italic>
 = −0.04,
<italic>P =</italic>
 0.86). Severity of pre-intervention pitting correlated significantly with changes in lower-limb volume for high-load (
<bold>a</bold>
) (
<italic>r</italic>
 = 0.47,
<italic>P =</italic>
 0.02) and low-load AECT (
<bold>b</bold>
) (
<italic>r</italic>
 = 0.45,
<italic>P =</italic>
 0.03), but not for CT (
<bold>c</bold>
) (
<italic>r</italic>
 = −0.31,
<italic>P =</italic>
 0.15)</p>
</caption>
<graphic xlink:href="520_2017_3671_Fig2_HTML" id="MO2"></graphic>
</fig>
</p>
</sec>
</sec>
<sec id="Sec16">
<title>Discussion</title>
<p id="Par36">No previous reports have provided data regarding the immediate effects of AECT on LLL. AECT for LLL thus lacks clear evidence regarding appropriate exercise intensity, timing, or type. Our study represents the first report of a randomized, controlled, crossover trial to evaluate the immediate effects of AECT on LLL. Changes in lower-limb volume were significantly greater with high-load AECT than with CT. Severity of skin stiffness and pitting edema symptoms pre-intervention correlated significantly with the volume decrement under both high- and low-load AECT.</p>
<sec id="Sec17">
<title>Interventions</title>
<p id="Par37">In our study, multi-layered compression bandaging using short stretch bandages was adopted as a compression therapy. Damstra et al. reported median sub-bandage pressure immediately after application as 64 mmHg [
<xref ref-type="bibr" rid="CR21">21</xref>
]. We applied a pressure of 40 mmHg, because a sub-bandage pressure exceeding 40 mmHg is recommended to counteract intravenous pressure in the antigravity position [
<xref ref-type="bibr" rid="CR22">22</xref>
], and sub-bandage pressure rises during exercise [
<xref ref-type="bibr" rid="CR18">18</xref>
]. To reduce the unevenness of the sub-bandage pressure in each participant, measurements were made at the facies posterior cruris using Kikuhime™ pressure sensors (TT Meditrade), which provide a digital output from pressure transducers comprising an air-filled pressure sensor and the device. The accuracy and precision of Kikuhime™ have already been reported [
<xref ref-type="bibr" rid="CR23">23</xref>
].</p>
<p id="Par38">Concerning the exercise modality, we considered that it was reasonable for patients with lymphedema to perform the exercises. In our study, active exercise therapy was performed on a bicycle ergometer, which offers some benefits. First, this modality is safe because of the low risk of falls. During pedaling, muscle activity of the whole lower limb is involved [
<xref ref-type="bibr" rid="CR24">24</xref>
]. In addition, pedaling reportedly places less stress on the knee joint than muscle strengthening exercises of the quadriceps with weight loading and squats [
<xref ref-type="bibr" rid="CR25">25</xref>
].</p>
<p id="Par39">This study involved a randomized crossover design in which participants completed three interventions separated by 1-week washout periods. Moseley et al. showed that the reduction in arm volume induced by exercise gradually returned, reaching the baseline volume by 60 min [
<xref ref-type="bibr" rid="CR14">14</xref>
]. The washout period in this study was thus judged as both necessary and sufficient.</p>
</sec>
<sec id="Sec18">
<title>Decrement in lower-limb volume</title>
<p id="Par40">Our results showed that the decrement in lower-limb volume was significantly higher with AECT than with CT. Godoy et al. showed immediate effects of AECT on ULL [
<xref ref-type="bibr" rid="CR13">13</xref>
], while Kim et al. [
<xref ref-type="bibr" rid="CR11">11</xref>
] reported that volume reduction of the upper limb was more effectively achieved with AECT than with CT. The present study obtained similar results for LLL as the preceding studies for ULL.</p>
<p id="Par41">CT with application of constant pressure to the skin has some beneficial effects, such as reduction of gravitational influence, restraint of excessive leakage out of blood vessels, improvement of lymph propulsion and lymphatic vessel recruitment, and increased lymphatic drainage [
<xref ref-type="bibr" rid="CR26">26</xref>
]. Moreover, skeletal muscle contraction or muscle pumping in AECT can create counterpressure in the form of expansion pressure against the bandages and stimulates lymphatic flow [
<xref ref-type="bibr" rid="CR10">10</xref>
–
<xref ref-type="bibr" rid="CR14">14</xref>
,
<xref ref-type="bibr" rid="CR27">27</xref>
]. As a result, AECT achieves a greater volume decrement for the lower limb than CT.</p>
<p id="Par42">Our study also detected that the decrement in lower-limb volume was greater with high-load AECT than with low-load AECT. The higher muscle contraction may be presumed to have created and stimulated greater lymphatic flow under high-load AECT than under low-load AECT.</p>
<p id="Par43">Concerning the period, the decrement of lower-limb volume was significantly higher in period 1 than in period 2 or 3. Because no interaction was seen between intervention and period, and the three interventions were assigned to each period equally, period effect was canceled out and did not affect the results.</p>
</sec>
<sec id="Sec19">
<title>General symptoms: pain and heaviness</title>
<p id="Par44">Gautam et al. showed that AECT for ULL significantly improved general symptoms [
<xref ref-type="bibr" rid="CR10">10</xref>
]. This study showed similar results for LLL as the preceding studies on ULL.</p>
<p id="Par45">In patients with lymphedema, pain is caused not only by inflammation, ischemia, complex regional pain syndrome, and cancer recurrence or progression, but also by tissue distension resulting from the accumulation of lymph fluid [
<xref ref-type="bibr" rid="CR27">27</xref>
]. Reductions in lower-limb volume with AECT result in decreased lower-limb weight and tissue expansion. Although significant improvements in pain and heaviness were seen with all interventions from pre- to post-intervention, no significant differences existed between the three interventions. Because little difference in lower-limb volume decrement was evident between interventions, participants might have perceived broadly comparable levels of relief. In addition, the VAS rating scale might have been insufficient to detect differences between AECT and CT.</p>
</sec>
<sec id="Sec20">
<title>Correlation between severity of pre-intervention skin symptoms and lower-limb volume decrement</title>
<p id="Par46">Because lymph contains a high concentration of plasma proteins such as albumin, the skin and subcutaneous tissue fibrosis are ongoing and harden as lymphedema becomes progressively severe [
<xref ref-type="bibr" rid="CR27">27</xref>
]. Although marked pitting is often evident in ISL stage II, pitting may or may not be present as skin tissue fibrosis becomes more evident in late stage II. Furthermore, pitting is absent in ISL stage III.</p>
<p id="Par47">Because all participants in our study were classified at stage II and late stage II and displayed some skin symptoms, significant improvement of pitting was seen with all interventions from pre- to post-intervention through the decrement in lower-limb volume.</p>
<p id="Par48">Although no significant difference between the three interventions was seen in pitting and skin stiffness, pre-intervention severity correlated significantly with the lower-limb volume decrement in AECT. This means that AECT would be more beneficial for severe LLL. Such findings are very important in clinical practice. AECT is more effective than CT for LLL that involves more marked pitting edema and/or harder skin. On the other hand, the immediate volume decrement from AECT is comparable to that from CT in LLL with less skin symptoms. Making treatment decisions on the basis of the severity of skin symptoms may therefore be warranted.</p>
</sec>
<sec id="Sec21">
<title>Limitations and future issues</title>
<p id="Par49">Use of a crossover design could reduce the influence of confounding covariates and could be statistically efficient. On the other hand, although each intervention was separated by a 1-week washout period to minimize carryover effects, the possibility of such effects cannot be completely ruled out. We used an original scale of skin symptoms based on palpation in clinical practice. Verification of psychometric properties such as reliability, validity, and reactivity is thus necessary. We also need to develop methods for quantitative evaluation.</p>
<p id="Par50">Concerning the indication criteria, because no participants in this study were at ISL stage III, the immediate effects of AECT on that population remain unknown.</p>
<p id="Par51">We examined the immediate effects of AECT, but long-term effects also need to be evaluated. In addition, exercise modalities for LLL need to be standardized by examining exercise type, intensity, duration, and frequency.</p>
</sec>
</sec>
</body>
<back>
<ack>
<title>Acknowledgements</title>
<p>This work was supported in part by JSPS KAKENHI Grant Number 26350586 and AMED Practical Research for Innovative Cancer Control Grant Number 16ck0106215. The authors thank the members of Department of Rehabilitation Medicine, Keio University School of Medicine and Keio University Hospital for their support; this research would not have been possible without their leadership and cooperation.</p>
</ack>
<notes notes-type="COI-statement">
<title>Compliance with ethical standards</title>
<p>The study protocol was approved by the ethics committee at Keio University Hospital. Informed consent was obtained from all individual participants included in the study prior to enrolment.</p>
<sec id="FPar1">
<title>Conflict of interest</title>
<p id="Par52">The authors declare that they have no conflicts of interest.</p>
</sec>
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