ParkinsonCanadaV1, PascalFrancis, Corpus, bibRecord, 000B87

Fear of falling modifies anticipatory postural control

Identifieur interne : 000B87 ( PascalFrancis/Corpus ); précédent : 000B86; suivant : 000B88

Fear of falling modifies anticipatory postural control

Auteurs : Allan L. Adkin ; James S. Frank ; Mark G. Carpenter ; Gerhard W. Peysar

Source :

Experimental brain research [ 0014-4819 ] ; 2002.

RBID : Pascal:02-0281141

Descripteurs français

Pascal (Inist)
- Ajustement postural, Posture, Anticipation, Point équilibre, Perturbation, Centre gravité, Mouvement corporel, Membre inférieur, Muscle strié, Electromyographie, Peur, Contrôle moteur, Homme.

English descriptors

KwdEn :
- Anticipation, Body movement, Center of mass, Electromyography, Equilibrium point, Fear, Human, Lower limb, Motor control, Perturbation, Postural fitting, Posture, Striated muscle.

Abstract

This study investigated the influence of fear of falling or postural threat on the control of posture and movement during a voluntary rise to toes task for 12 healthy young adults. Postural threat was modified through alterations to the surface height at which individuals stood (low or high platform) and changes in step restriction (away from or at the edge of the platform) creating four levels of postural threat: LOW AWAY, LOW EDGE, HIGH AWAY and HIGH EDGE. To rise to the toes, an initial postural adjustment must destabilise the body so that it can be moved forward and elevated to a new position of support over the toes. Centre of pressure and centre of mass profiles, as well as tibialis anterior (TA), soleus (SO) and gastrocnemius (GA) muscle activity patterns were used to describe this behaviour. The results showed that the performance of the rise to toes task was significantly modified when positioned at the edge of the high platform. In this situation, the central nervous system reduced the magnitude and rate of the postural adjustments and subsequent voluntary movement. Although the duration of the movement was lengthened for this most threatening condition, the sequencing and relative timing of TA, SO and GA muscle activity was preserved. These changes in rise to toes behaviour were accompanied by evidence of increased physiological arousal and participant reports of decreased confidence, increased anxiety and decreased stability. Evidence of fear of falling effects on anticipatory postural control is clinically relevant as it may explain deficits in this control observed in individuals with balance disorders. For example, individuals with Parkinson's disease or cerebellar dysfunction demonstrate impaired performance on the rise to toes task as reflected in alterations of both the timing and magnitude of their anticipatory postural adjustments. Our findings suggest alterations in the magnitude of postural adjustments may be magnified by fear of falling while changes in the timing of postural adjustments may reflect underlying pathology.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A11	`03`	`1`		`@1 CARPENTER (Mark G.)`
A11	`04`	`1`		`@1 PEYSAR (Gerhard W.)`
A14	`01`			`@1 Gait and Posture Laboratory, Department of Kinesiology, 200 University Avenue West, University of Waterloo @2 Waterloo, Ontario, N2L 3G1 @3 CAN @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut.`
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C01	`01`		`ENG`	@0 This study investigated the influence of fear of falling or postural threat on the control of posture and movement during a voluntary rise to toes task for 12 healthy young adults. Postural threat was modified through alterations to the surface height at which individuals stood (low or high platform) and changes in step restriction (away from or at the edge of the platform) creating four levels of postural threat: LOW AWAY, LOW EDGE, HIGH AWAY and HIGH EDGE. To rise to the toes, an initial postural adjustment must destabilise the body so that it can be moved forward and elevated to a new position of support over the toes. Centre of pressure and centre of mass profiles, as well as tibialis anterior (TA), soleus (SO) and gastrocnemius (GA) muscle activity patterns were used to describe this behaviour. The results showed that the performance of the rise to toes task was significantly modified when positioned at the edge of the high platform. In this situation, the central nervous system reduced the magnitude and rate of the postural adjustments and subsequent voluntary movement. Although the duration of the movement was lengthened for this most threatening condition, the sequencing and relative timing of TA, SO and GA muscle activity was preserved. These changes in rise to toes behaviour were accompanied by evidence of increased physiological arousal and participant reports of decreased confidence, increased anxiety and decreased stability. Evidence of fear of falling effects on anticipatory postural control is clinically relevant as it may explain deficits in this control observed in individuals with balance disorders. For example, individuals with Parkinson's disease or cerebellar dysfunction demonstrate impaired performance on the rise to toes task as reflected in alterations of both the timing and magnitude of their anticipatory postural adjustments. Our findings suggest alterations in the magnitude of postural adjustments may be magnified by fear of falling while changes in the timing of postural adjustments may reflect underlying pathology.
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Format Inist (serveur)

NO :	PASCAL 02-0281141 INIST
ET :	Fear of falling modifies anticipatory postural control
AU :	ADKIN (Allan L.); FRANK (James S.); CARPENTER (Mark G.); PEYSAR (Gerhard W.)
AF :	Gait and Posture Laboratory, Department of Kinesiology, 200 University Avenue West, University of Waterloo/Waterloo, Ontario, N2L 3G1/Canada (1 aut., 2 aut., 3 aut., 4 aut.)
DT :	Publication en série; Niveau analytique
SO :	Experimental brain research; ISSN 0014-4819; Coden EXBRAP; Allemagne; Da. 2002; Vol. 143; No. 2; Pp. 160-170; Bibl. 41 ref.
LA :	Anglais
EA :	This study investigated the influence of fear of falling or postural threat on the control of posture and movement during a voluntary rise to toes task for 12 healthy young adults. Postural threat was modified through alterations to the surface height at which individuals stood (low or high platform) and changes in step restriction (away from or at the edge of the platform) creating four levels of postural threat: LOW AWAY, LOW EDGE, HIGH AWAY and HIGH EDGE. To rise to the toes, an initial postural adjustment must destabilise the body so that it can be moved forward and elevated to a new position of support over the toes. Centre of pressure and centre of mass profiles, as well as tibialis anterior (TA), soleus (SO) and gastrocnemius (GA) muscle activity patterns were used to describe this behaviour. The results showed that the performance of the rise to toes task was significantly modified when positioned at the edge of the high platform. In this situation, the central nervous system reduced the magnitude and rate of the postural adjustments and subsequent voluntary movement. Although the duration of the movement was lengthened for this most threatening condition, the sequencing and relative timing of TA, SO and GA muscle activity was preserved. These changes in rise to toes behaviour were accompanied by evidence of increased physiological arousal and participant reports of decreased confidence, increased anxiety and decreased stability. Evidence of fear of falling effects on anticipatory postural control is clinically relevant as it may explain deficits in this control observed in individuals with balance disorders. For example, individuals with Parkinson's disease or cerebellar dysfunction demonstrate impaired performance on the rise to toes task as reflected in alterations of both the timing and magnitude of their anticipatory postural adjustments. Our findings suggest alterations in the magnitude of postural adjustments may be magnified by fear of falling while changes in the timing of postural adjustments may reflect underlying pathology.
CC :	002A25E
FD :	Ajustement postural; Posture; Anticipation; Point équilibre; Perturbation; Centre gravité; Mouvement corporel; Membre inférieur; Muscle strié; Electromyographie; Peur; Contrôle moteur; Homme
ED :	Postural fitting; Posture; Anticipation; Equilibrium point; Perturbation; Center of mass; Body movement; Lower limb; Striated muscle; Electromyography; Fear; Motor control; Human
SD :	Ajuste postural; Postura; Anticipación; Punto equilibrio; Perturbación; Centro gravitacional; Movimiento corporal; Miembro inferior; Músculo estriado; Electromiografía; Miedo; Control motor; Hombre
LO :	INIST-12535.354000102775730030
ID :	02-0281141

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Pascal:02-0281141

Le document en format XML

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<front><div type="abstract" xml:lang="en">This study investigated the influence of fear of falling or postural threat on the control of posture and movement during a voluntary rise to toes task for 12 healthy young adults. Postural threat was modified through alterations to the surface height at which individuals stood (low or high platform) and changes in step restriction (away from or at the edge of the platform) creating four levels of postural threat: LOW AWAY, LOW EDGE, HIGH AWAY and HIGH EDGE. To rise to the toes, an initial postural adjustment must destabilise the body so that it can be moved forward and elevated to a new position of support over the toes. Centre of pressure and centre of mass profiles, as well as tibialis anterior (TA), soleus (SO) and gastrocnemius (GA) muscle activity patterns were used to describe this behaviour. The results showed that the performance of the rise to toes task was significantly modified when positioned at the edge of the high platform. In this situation, the central nervous system reduced the magnitude and rate of the postural adjustments and subsequent voluntary movement. Although the duration of the movement was lengthened for this most threatening condition, the sequencing and relative timing of TA, SO and GA muscle activity was preserved. These changes in rise to toes behaviour were accompanied by evidence of increased physiological arousal and participant reports of decreased confidence, increased anxiety and decreased stability. Evidence of fear of falling effects on anticipatory postural control is clinically relevant as it may explain deficits in this control observed in individuals with balance disorders. For example, individuals with Parkinson's disease or cerebellar dysfunction demonstrate impaired performance on the rise to toes task as reflected in alterations of both the timing and magnitude of their anticipatory postural adjustments. Our findings suggest alterations in the magnitude of postural adjustments may be magnified by fear of falling while changes in the timing of postural adjustments may reflect underlying pathology.</div>
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<fC01 i1="01" l="ENG"><s0>This study investigated the influence of fear of falling or postural threat on the control of posture and movement during a voluntary rise to toes task for 12 healthy young adults. Postural threat was modified through alterations to the surface height at which individuals stood (low or high platform) and changes in step restriction (away from or at the edge of the platform) creating four levels of postural threat: LOW AWAY, LOW EDGE, HIGH AWAY and HIGH EDGE. To rise to the toes, an initial postural adjustment must destabilise the body so that it can be moved forward and elevated to a new position of support over the toes. Centre of pressure and centre of mass profiles, as well as tibialis anterior (TA), soleus (SO) and gastrocnemius (GA) muscle activity patterns were used to describe this behaviour. The results showed that the performance of the rise to toes task was significantly modified when positioned at the edge of the high platform. In this situation, the central nervous system reduced the magnitude and rate of the postural adjustments and subsequent voluntary movement. Although the duration of the movement was lengthened for this most threatening condition, the sequencing and relative timing of TA, SO and GA muscle activity was preserved. These changes in rise to toes behaviour were accompanied by evidence of increased physiological arousal and participant reports of decreased confidence, increased anxiety and decreased stability. Evidence of fear of falling effects on anticipatory postural control is clinically relevant as it may explain deficits in this control observed in individuals with balance disorders. For example, individuals with Parkinson's disease or cerebellar dysfunction demonstrate impaired performance on the rise to toes task as reflected in alterations of both the timing and magnitude of their anticipatory postural adjustments. Our findings suggest alterations in the magnitude of postural adjustments may be magnified by fear of falling while changes in the timing of postural adjustments may reflect underlying pathology.</s0>
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<fC03 i1="05" i2="X" l="ENG"><s0>Perturbation</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Perturbación</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Centre gravité</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Center of mass</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Centro gravitacional</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Mouvement corporel</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Body movement</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Movimiento corporal</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Membre inférieur</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Lower limb</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Miembro inferior</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Muscle strié</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Striated muscle</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Músculo estriado</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Electromyographie</s0>
<s5>11</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Electromyography</s0>
<s5>11</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Electromiografía</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Peur</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Fear</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Miedo</s0>
<s5>13</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Contrôle moteur</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Motor control</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Control motor</s0>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Homme</s0>
<s5>54</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Human</s0>
<s5>54</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Hombre</s0>
<s5>54</s5>
</fC03>
<fN21><s1>161</s1>
</fN21>
</pA>
</standard>
<server><NO>PASCAL 02-0281141 INIST</NO>
<ET>Fear of falling modifies anticipatory postural control</ET>
<AU>ADKIN (Allan L.); FRANK (James S.); CARPENTER (Mark G.); PEYSAR (Gerhard W.)</AU>
<AF>Gait and Posture Laboratory, Department of Kinesiology, 200 University Avenue West, University of Waterloo/Waterloo, Ontario, N2L 3G1/Canada (1 aut., 2 aut., 3 aut., 4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Experimental brain research; ISSN 0014-4819; Coden EXBRAP; Allemagne; Da. 2002; Vol. 143; No. 2; Pp. 160-170; Bibl. 41 ref.</SO>
<LA>Anglais</LA>
<EA>This study investigated the influence of fear of falling or postural threat on the control of posture and movement during a voluntary rise to toes task for 12 healthy young adults. Postural threat was modified through alterations to the surface height at which individuals stood (low or high platform) and changes in step restriction (away from or at the edge of the platform) creating four levels of postural threat: LOW AWAY, LOW EDGE, HIGH AWAY and HIGH EDGE. To rise to the toes, an initial postural adjustment must destabilise the body so that it can be moved forward and elevated to a new position of support over the toes. Centre of pressure and centre of mass profiles, as well as tibialis anterior (TA), soleus (SO) and gastrocnemius (GA) muscle activity patterns were used to describe this behaviour. The results showed that the performance of the rise to toes task was significantly modified when positioned at the edge of the high platform. In this situation, the central nervous system reduced the magnitude and rate of the postural adjustments and subsequent voluntary movement. Although the duration of the movement was lengthened for this most threatening condition, the sequencing and relative timing of TA, SO and GA muscle activity was preserved. These changes in rise to toes behaviour were accompanied by evidence of increased physiological arousal and participant reports of decreased confidence, increased anxiety and decreased stability. Evidence of fear of falling effects on anticipatory postural control is clinically relevant as it may explain deficits in this control observed in individuals with balance disorders. For example, individuals with Parkinson's disease or cerebellar dysfunction demonstrate impaired performance on the rise to toes task as reflected in alterations of both the timing and magnitude of their anticipatory postural adjustments. Our findings suggest alterations in the magnitude of postural adjustments may be magnified by fear of falling while changes in the timing of postural adjustments may reflect underlying pathology.</EA>
<CC>002A25E</CC>
<FD>Ajustement postural; Posture; Anticipation; Point équilibre; Perturbation; Centre gravité; Mouvement corporel; Membre inférieur; Muscle strié; Electromyographie; Peur; Contrôle moteur; Homme</FD>
<ED>Postural fitting; Posture; Anticipation; Equilibrium point; Perturbation; Center of mass; Body movement; Lower limb; Striated muscle; Electromyography; Fear; Motor control; Human</ED>
<SD>Ajuste postural; Postura; Anticipación; Punto equilibrio; Perturbación; Centro gravitacional; Movimiento corporal; Miembro inferior; Músculo estriado; Electromiografía; Miedo; Control motor; Hombre</SD>
<LO>INIST-12535.354000102775730030</LO>
<ID>02-0281141</ID>
</server>
</inist>
</record>

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	La maladie de Parkinson au Canada (serveur d'exploration)
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La maladie de Parkinson au Canada (serveur d'exploration)

Fear of falling modifies anticipatory postural control

Fear of falling modifies anticipatory postural control

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