Temperature dependence of soleus H-reflex and M wave in young and older women

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Temperature dependence of soleus H-reflex and M wave in young and older women. / Dewhurst, Susan; Riches, Philip E; Nimmo, Myra A; De Vito, Giuseppe.

In: European Journal of Applied Physiology, Vol. 94, No. 5-6, 08.2005, p. 491-9.

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Dewhurst, Susan ; Riches, Philip E ; Nimmo, Myra A ; De Vito, Giuseppe. / Temperature dependence of soleus H-reflex and M wave in young and older women. In: European Journal of Applied Physiology. 2005 ; Vol. 94, No. 5-6. pp. 491-9.

Bibtex

@article{cc55354d90004cd6a17d5dc8b24608f7,
title = "Temperature dependence of soleus H-reflex and M wave in young and older women",
abstract = "The purpose of this study was to investigate the effect of altered local temperature on soleus H-reflex and compound muscle action potential (M wave) in young and older women. H-reflex and M wave responses were elicited in 10 young (22.3 +/- 3.3 years) and 10 older (72.5 +/- 3.2 years) women at three muscle temperatures: control (34.2 +/- 0.3 degrees C), cold (31.3+/-0.5 degrees C) and warm (37.1 +/- 0.2 degrees C). H-reflex output, expressed as the ratio between maximal H-reflex and maximal M wave (H(max)/M(max)), was lower in the older, compared with the younger, group, regardless of temperature. In control temperature conditions, for example, the H(max)/M(max) ratio was 36.8 +/- 24% in the young and 25.4 +/- 20% in the older (P<0.05). Warming had no effect on the H-reflex output in either group, whilst cooling increased H-reflex output only in the younger group (+28%). In both groups, cooling increased (+5.3%), and warming decreased (-5.5%) the H-reflex latency. This study confirms that older individuals experience a reduced ability to modulate the reflex output in response to a perturbation. In a cold environment, for example, the lack of facilitation in the reflex output, along with a delayed reflex response could be critical to an older individual in responding to postural perturbations thus potentially compromising both static and dynamic balance.",
keywords = "Action Potentials, Adaptation, Physiological, Adult, Age Factors, Aged, Aging, Ankle Joint, Body Temperature, Electric Stimulation, Electromyography, Female, H-Reflex, Humans, Muscle Contraction, Muscle, Skeletal, Temperature",
author = "Susan Dewhurst and Riches, {Philip E} and Nimmo, {Myra A} and {De Vito}, Giuseppe",
year = "2005",
month = aug,
doi = "10.1007/s00421-005-1384-6",
language = "English",
volume = "94",
pages = "491--9",
journal = "European Journal of Applied Physiology",
issn = "1439-6319",
publisher = "Springer Verlag",
number = "5-6",

}

RIS

TY - JOUR

T1 - Temperature dependence of soleus H-reflex and M wave in young and older women

AU - Dewhurst, Susan

AU - Riches, Philip E

AU - Nimmo, Myra A

AU - De Vito, Giuseppe

PY - 2005/8

Y1 - 2005/8

N2 - The purpose of this study was to investigate the effect of altered local temperature on soleus H-reflex and compound muscle action potential (M wave) in young and older women. H-reflex and M wave responses were elicited in 10 young (22.3 +/- 3.3 years) and 10 older (72.5 +/- 3.2 years) women at three muscle temperatures: control (34.2 +/- 0.3 degrees C), cold (31.3+/-0.5 degrees C) and warm (37.1 +/- 0.2 degrees C). H-reflex output, expressed as the ratio between maximal H-reflex and maximal M wave (H(max)/M(max)), was lower in the older, compared with the younger, group, regardless of temperature. In control temperature conditions, for example, the H(max)/M(max) ratio was 36.8 +/- 24% in the young and 25.4 +/- 20% in the older (P<0.05). Warming had no effect on the H-reflex output in either group, whilst cooling increased H-reflex output only in the younger group (+28%). In both groups, cooling increased (+5.3%), and warming decreased (-5.5%) the H-reflex latency. This study confirms that older individuals experience a reduced ability to modulate the reflex output in response to a perturbation. In a cold environment, for example, the lack of facilitation in the reflex output, along with a delayed reflex response could be critical to an older individual in responding to postural perturbations thus potentially compromising both static and dynamic balance.

AB - The purpose of this study was to investigate the effect of altered local temperature on soleus H-reflex and compound muscle action potential (M wave) in young and older women. H-reflex and M wave responses were elicited in 10 young (22.3 +/- 3.3 years) and 10 older (72.5 +/- 3.2 years) women at three muscle temperatures: control (34.2 +/- 0.3 degrees C), cold (31.3+/-0.5 degrees C) and warm (37.1 +/- 0.2 degrees C). H-reflex output, expressed as the ratio between maximal H-reflex and maximal M wave (H(max)/M(max)), was lower in the older, compared with the younger, group, regardless of temperature. In control temperature conditions, for example, the H(max)/M(max) ratio was 36.8 +/- 24% in the young and 25.4 +/- 20% in the older (P<0.05). Warming had no effect on the H-reflex output in either group, whilst cooling increased H-reflex output only in the younger group (+28%). In both groups, cooling increased (+5.3%), and warming decreased (-5.5%) the H-reflex latency. This study confirms that older individuals experience a reduced ability to modulate the reflex output in response to a perturbation. In a cold environment, for example, the lack of facilitation in the reflex output, along with a delayed reflex response could be critical to an older individual in responding to postural perturbations thus potentially compromising both static and dynamic balance.

KW - Action Potentials

KW - Adaptation, Physiological

KW - Adult

KW - Age Factors

KW - Aged

KW - Aging

KW - Ankle Joint

KW - Body Temperature

KW - Electric Stimulation

KW - Electromyography

KW - Female

KW - H-Reflex

KW - Humans

KW - Muscle Contraction

KW - Muscle, Skeletal

KW - Temperature

U2 - 10.1007/s00421-005-1384-6

DO - 10.1007/s00421-005-1384-6

M3 - Article

C2 - 15952024

VL - 94

SP - 491

EP - 499

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 1439-6319

IS - 5-6

ER -