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MEDICINA DELLO SPORT
A Journal on Sports Medicine
Official Journal of the Italian Sports Medicine Federation
Indexed/Abstracted in: BIOSIS Previews, EMBASE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 0,163
Medicina dello Sport 2002 December;55(4):279-86
Twitch contractile properties of plantarflexor muscles in female power-trained athletes
Paasuke M., Ereline J., Gapeyeva H., Torop T.
Institute of Exercise Biology and Physiotherapy, University of Tartu, Tartu, Estonia
The purpose of the present study was to provide detailed comparison of isometric twitch contractile properties of skeletal muscles associated with post-activation potentiation (PAP) after isometric maximal voluntary contraction (MVC) of short duration in female power-trained athletes and untrained control subjects.
Twitch contractile properties with association of PAP of the plantarflexor (PF) muscles in 11 female power-trained athletes (20.6±0.7 years) and 14 untrained university students as controls (20.7±0.2 years) were compared. Subjects were seated in a specially designed dynamometric chair. To determine the contractile properties of PF muscles during isometric twitch, the posterior tibial nerve in popliteal fossa was stimulated by supramaximal square wave pulses of 1 ms duration. Isometric twitches of the plantarflexor muscles were recorded before (resting twitch) and after brief (5-s) MVC (post activation twitch).
The results indicated that female power-trained athletes had higher (p<0.05) values of isometric MVC force, MVC force relative to body mass, and post-activation twitch maximal force and maximal rate of force development as compared to untrained women. PAP in respect of increase of maximal twitch force after MVC was also higher (p<0.05) in power-trained athletes than in untrained subjects. Power-trained athletes had shorter resting and post-activation twitch contraction time compared to untrained women. No significant differences in resting and post-activation twitch half-relaxation time, and rate of relaxation were found between the groups.
We concluded that female power-trained athletes had a greater evoked twitch force-generation and force-potentiation capacity, and speed of contraction in plantarflexor muscles compared to untrained women, indicating an adaptation of the peripheral part of the neuromuscular system to explosive type of strength training. Power training did not induce significant changes in time course and speed of muscle relaxation in women.