Effects of Temperature and Angular Velocity on Eccentric Force of an Intrinsic Thumb Muscle

Authors

  • Nordan Flaaten University of Calgary
  • Geoffery A Power University of Guelph
  • Walter Herzog University of Calgary

Keywords:

Electrical Stimulation, Eccentric to Isometric Force Ratio, Addictor Pollicis

Abstract

Temperature and velocity have significant effects on muscle contractile properties. For example, it is well known that changing angular velocity and altering muscle temperature can change the force-producing capacity of muscle. It is typically understood that with increasing shortening velocity and cooler temperature force decreases. However, the influence of temperature and angular velocity on force during lengthening contractions is less understood.  The purpose of this study was to determine whether temperature and/or velocity has an effect on the eccentric to isometric force ratio of the adductor pollicis muscle in young males. Ten young (~25y) male subjects performed lengthening (0-40°) electrically-evoked contractions of the left adductor pollicis muscles at ~50% of maximum voluntary force at angular velocities ranging from 0-320°/s. This procedure was performed initially at room temperature (21˚C), and then repeated two more times after a 20min bath, first in a cold (15°C) water and then in a warm (43°C) water bath in order to change the muscle temperature. The eccentric to isometric ratio was significantly greater in the cold compared to the normal condition (P<0.05), but was not different from normal for the warm condition (P>0.05). The eccentric to isometric ratio was significantly greater at 80, 160 and 320°/s (P<0.05) than at 20°/s, but was not different at velocities slower than 80°/s (P>0.05).  Instantaneous stiffness was measured 1 s after attaining maximum stretch. There was a significant (~38%) increase in active stiffness in the cold muscle compared to normal. No significant difference (~15%) in stiffness was observed for the warm compared with the normal condition, and no significant difference (~20%) was found between warm and cold muscles. The findings suggest that there is an increased force per cross-bridge as temperature approaches normal physiological temperature, but decreases when temperature deviates from normal.

Author Biographies

Nordan Flaaten, University of Calgary

Department of Kinesiology

Geoffery A Power, University of Guelph

Professor, Faculty of Kinesiology

Walter Herzog, University of Calgary

Professor, Faculties of Kinesiology, Engineering and Medicine; Co-Director, Human Performance Laboratory

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Published

2015-08-25

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