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Vol. 84, Issue 1, 344-350, January 1998
Department of Biology of Physical Activity, University of Jyvskyl, 40100 Jyvskyl, Finland
Strojnik, V., and P. V. Komi. Neuromuscular fatigue
after maximal stretch-shortening cycle exercise. J. Appl. Physiol. 84(1): 344-350, 1998.
To examine
some possible sites of fatigue during short-lasting maximally intensive
stretch-shortening cycle exercise, drop jumps on an inclined sledge
apparatus were analyzed. Twelve healthy volunteers performed jumps
until they were unable to maintain jumping height >90% of their
maximum. After the workout, the increases in the blood lactate
concentration and serum creatine kinase activation were statistically
significant (P < 0.001 and P < 0.05, respectively) but rather
small in physiological terms. The major changes after the workout were
as follows: the single twitch was characterized by smaller peak torque
(P < 0.05) and shorter time to peak
(P < 0.05) and half-relaxation time
(P < 0.01). The double-twitch torque
remained at the same level (P > 0.05), but with a steeper maximal slope of torque rise
(P < 0.05); during 20- and 100-Hz
stimulation the torque declined (both P < 0.01) and the maximal voluntary
torque changed nonsignificantly but with a smaller maximal slope of
torque rise (P < 0.01) and a higher
activation level (P < 0.05),
accompanied by an increased electromyogram amplitude. These findings
indicate that the muscle response after the short-lasting consecutive
maximum jumps on the sledge apparatus may involve two distinct
mechanisms acting in opposite directions:
1) The contractile mechanism seems
to be potentiated through a shorter
Ca2+ transient and faster
cross-bridge cycling, as implied by twitch changes.
2) High-frequency action potential
propagation shows an impairment, which is suggested as the possible
dominant reason for fatigue in exercise of this type.
fatigue sites; maximal intensity; short duration; electrical stimulation
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