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TEMPERATURE EFFECT ON THE RATES OF ISOMETRIC FORCE DEVELOPMENT AND RELAXATION IN THE FRESH AND FATIGUED HUMAN ADDUCTOR POLLICIS MUSCLE

Published online by Cambridge University Press:  04 January 2001

C. J. DE RUITER ,
D. A. JONES ,
A. J. SARGEANT  and
A. DE HAAN
C. J. DE RUITER
Affiliation:
Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije University, Amsterdam, The Netherlands
D. A. JONES
Affiliation:
School of Sport and Exercise Sciences, The University of Birmingham, UK
A. J. SARGEANT
Affiliation:
Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije University, Amsterdam, The Netherlands and Neuromuscular Biology Group, Manchester Metropolitan University, UK
A. DE HAAN
Affiliation:
Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije University, Amsterdam, The Netherlands
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Abstract

The purpose of the present study was to investigate the effect of temperature on the rates of isometric force development and relaxation in electrically activated fresh and fatigued human adductor pollicis muscle. Following immersion of the lower arm for 20 min in water baths of four different temperatures, muscle temperatures were approximately 37, 31, 25 and 22°C. Maximal isometric force was reduced by 16·8 ± 1·5 % at 22°C. The stimulation frequency-force and -rate of force development relationships were shifted to the left at lower temperatures. Q10 values for the maximal rates of force development and relaxation, and the times for 100 to 50 % and 50 to 25 % force relaxation, were about 2·0 between 37 and 25°C and about 3·8 between 25 and 22°C. However, the time for 50 to 25 % force relaxation had a relatively high Q10 value between 25 and 22°C (6·9) and this parameter also appeared to be more sensitive to fatigue compared to the other indices of relaxation. Nevertheless, the effect of fatigue on all parameters decreased with cooling over the entire (37-22°C) temperature range.

Type
Research Article
Information
Experimental Physiology , Volume 84 , Issue 6 , November 1999 , pp. 1137 - 1150
Copyright
© The Physiological Society 1999

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