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Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, FIN-40100 Jyväskylä, Finland
Experiments were
carried out to test the effect of prolonged and repeated passive
stretching (RPS) of the triceps surae muscle on reflex sensitivity. The
results demonstrated a clear deterioration of muscle function
immediately after RPS. Maximal voluntary contraction, average
electromyographic activity of the gastrocnemius and soleus muscles, and
zero crossing rate of the soleus muscle (recorded from 50% maximal
voluntary contraction) decreased on average by 23.2, 19.9, 16.5, and
12.2%, respectively. These changes were associated with a clear
immediate reduction in the reflex sensitivity; stretch reflex
peak-to-peak amplitude decreased by 84.8%, and the ratio of the
electrically induced maximal Hoffmann reflex to the maximal mass
compound action potential decreased by 43.8%. Interestingly, a
significant (P < 0.01) reduction in
the stretch-resisting force of the measured muscles was observed. Serum
creatine kinase activity stayed unaltered. This study presents evidence
that the mechanism that decreases the sensitivity of short-latency
reflexes can be activated because of RPS. The origin of this system
seems to be a reduction in the activity of the large-diameter
afferents, resulting from the reduced sensitivity of the muscle
spindles to repeated stretch.
neuromuscular fatigue; central fatigue; muscle stretching; stretch reflex; electromyography
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