Effects of fatiguing isometric exercise upon achilles tendon reflex and plantar flexion reaction time components in man.

European Journal of Applied Physiology and Occupational Physiology
K C Hayes

Abstract

Effects of three different fatiguing local muscular exercises upon plantar flexion reaction time and achilles tendon reflex time have been studied in 24 normal males. The Exercise Conditions, each involving a series of 30 maximal voluntary isometric contractions (MVC) of the plantar flexors, differed by allowing either 5, 10 or 20 sec rest interval between each MVC. Decrements in strength ranged from 15% to 34% MVC. Trend analysis of the fatigue patterns revealed that a cubic orthogonal polynomial equation was sufficient to describe the profile of MVC decrement for all conditions. Following the fatiguing exercise, simple visual reaction time (plantar flexion), and its two components, premotor and motor time, failed to demonstrate any change from Pre Exercise Conditions. Achilles Tendon Reflex Times, however, demonstrated a marked augmentation, as manifest in reduced total reflex times, contraction times and half relaxation times. These results may suggest the differential fatigue of motor units employed in the three motor tasks, viz. MVC, voluntary reaction and achilles tendon reflex. A plausible explanation for the augmentation of the reflex contraction resides in the known potentiating effect of elevated intramuscular temper...Continue Reading

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Citations

Jun 15, 1977·European Journal of Applied Physiology and Occupational Physiology·A F Morris
Aug 1, 1979·European Journal of Applied Physiology and Occupational Physiology·G A Wood
Jan 1, 1990·European Journal of Applied Physiology and Occupational Physiology·T RyushiH Nakajima
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Feb 15, 2012·The Journal of Spinal Cord Medicine·Mandeep S DhindsaLisa Griffin
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Nov 1, 1977·Toxicology and Applied Pharmacology·M M Verberk, H J Sallé
Sep 10, 2014·Medicine and Science in Sports and Exercise·Anita D Christie, Nick R Miller
Aug 23, 2006·Experimental Brain Research·A BiroE Cafarelli
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Jun 19, 2001·Medicine and Science in Sports and Exercise·P F VintG M Harron
Dec 1, 1981·Perceptual and Motor Skills·M FleuryL Carrière

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