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

Authors: Dewhurst, S., Riches, P.E., Nimmo, M.A. and De Vito, G.

Journal: European Journal of Applied Physiology

Volume: 94

Issue: 5-6

Pages: 491-499

ISSN: 1439-6319

DOI: 10.1007/s00421-005-1384-6

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°C), cold (31.3±0.5°C) and warm (37.1±0.2°C). H-reflex output, expressed as the ratio between maximal H-reflex and maximal M wave (Hmax/Mmax), was lower in the older, compared with the younger, group, regardless of temperature. In control temperature conditions, for example, the Hmax/Mmax 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. © Springer-Verlag 2005.

Source: Scopus

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

Authors: Dewhurst, S., Riches, P.E., Nimmo, M.A. and De Vito, G.

Journal: Eur J Appl Physiol

Volume: 94

Issue: 5-6

Pages: 491-499

ISSN: 1439-6319

DOI: 10.1007/s00421-005-1384-6

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.

Source: PubMed

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

Authors: Dewhurst, S., Riches, P.E., Nimmo, M.A. and De Vito, G.

Journal: EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY

Volume: 94

Issue: 5-6

Pages: 491-499

eISSN: 1439-6327

ISSN: 1439-6319

DOI: 10.1007/s00421-005-1384-6

Source: Web of Science (Lite)

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

Authors: Dewhurst, S., Riches, P.E., Nimmo, M.A. and De Vito, G.

Journal: European journal of applied physiology

Volume: 94

Issue: 5-6

Pages: 491-499

Publisher: Springer Verlag

ISSN: 1439-6319

DOI: 10.1007/s00421-005-1384-6

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.

Source: Manual

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

Authors: Dewhurst, S., Riches, P.E., Nimmo, M.A. and De Vito, G.

Journal: European journal of applied physiology

Volume: 94

Issue: 5-6

Pages: 491-499

eISSN: 1439-6327

ISSN: 1439-6319

DOI: 10.1007/s00421-005-1384-6

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.

Source: Europe PubMed Central