Decreased EMG median frequency during a second bout of eccentric contractions

Article Abstract:

Decreased electromyographic (EMG) median frequency in a second bout of eccentric contractions has been studied. It was found that with repetition of maximal voluntary eccentric contractions greater activation of slow motor units exists. At the same time there is lower activation of fast units.

Injuries, Muscles, Leg, Sports, Leg muscles

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Effects of eccentric exercise on trunk extensor torque and lumbar paraspinal EMG

Article Abstract:

This article examines the effects of a session of maximal eccentric contractions involving the trunk extensor muscles on electromyographic parameters and torque production in the lumbar paraspinal region. Findings indicate that eccentric contractions resulted in increased electromyographic activity and reduced neuromuscular efficiency in isometric torque production.

Measurement, Torque, Lumbar curve

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Neuromuscular response of young boys versus men during sustained maximal contraction

Article Abstract:

Results indicate that there are differences in muscle's metabolic and ionic state, between boys and men, which leads to a higher reflex-induced motor units firing rates decrease in men compared with boys. Data show that in men, more fatigable Type II motor units mediate enhanced lactic acid and ions accumulations during fatigue.

France, Comparative analysis

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