Frequent alternate muscle activity of plantar flexor synergists and muscle endurance during low-level static contractions as a function of ankle position

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Muscle Shear Moduli Changes and Frequency of Alternate Muscle Activity of Plantar Flexor Synergists Induced by Prolonged Low-Level Contraction

During prolonged low-level contractions, synergist muscles are activated in an alternating pattern of activity and silence called as alternate muscle activity. Resting muscle stiffness is considered to increase due to muscle fatigue. Thus, we investigated whether the difference in the extent of fatigue of each plantar flexor synergist corresponded to the difference in the frequency of alternate...

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Alternate muscle activity observed between knee extensor synergists during low-level sustained contractions.

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The role of ankle plantar flexor muscle work during walking.

Impaired ankle plantar flexor (APF) function is a frequent cause of gait limitations, but the role of the APF in the forward propulsion of the body remains controversial. To better understand both the direct and indirect effects of the APF during push-off and through advancement of the leg, mechanical work and inverse dynamic analyses were performed on 8 normal subjects during level walking. Du...

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Relationship between Ankle Plantar Flexor Power and Emg Muscle Activity during Gait

It is thought that the ankle power (A2) burst observed in human gait is solely generated by rapid concentric contraction of the ankle plantar flexors. Recent work, however, suggests that the return of elastic energy may play a role. This study investigated the temporal relationship between the maximum electromyographic activity (EMG) of the ankle plantar flexors and A2. The natural gait of eigh...

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Force fluctuations are modulated by alternate muscle activity of knee extensor synergists during low-level sustained contraction.

The study examined the hypothesis that altered synergistic activation of the knee extensors leads to cyclic modulation of the force fluctuations. To test this hypothesis, the force fluctuations were investigated during sustained knee extension at 2.5% of maximal voluntary contraction force for 60 min in 11 men. Surface electromyograms (EMG) were recorded from the rectus femoris (RF), vastus lat...

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ژورنال

عنوان ژورنال: The Journal of Physiological Sciences

سال: 2011

ISSN: 1880-6546,1880-6562

DOI: 10.1007/s12576-011-0157-8