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• W1507657394 abstract "Normal subjects were asked to make rapid flexions of the legs from a stationary initial standing posture in a self-paced mode. Because this movement implicates a rapid change in posture, questions were asked about the type of central command which must include the rupture of the erect posture and the accomplishment of the goal directed movement. Movements of the different segments of the body were recorded and analyzed using the optoelectronic ELITE system. Electromyographic (EMG) activities of 8 muscles of the lower limb on one side were recorded, rectified and integrated. The time relationships of the different EMG signals (activation or deactivation) were analyzed with respect to selected kinetic measures of the related segments of the body. In the majority of the subjects, before the movement onset, EMG events included a specific deactivation of the tonic EMG activity of the semimembranous (SM) and semitendinous (ST) muscles (time onset relative to the onset of the legs flexion: −196.9±96.4 ms and −180.5±89.7 ms, respectively). A second event was a phasic activation of the tibialis anterior (TA) muscle (time onset: −60.5±117.6 ms). Conjugate cross-correlation analysis of these EMG signals demonstrated the existence of a common coordinated strategy between the deactivation of the hamstring and the TA activation. Even though a small horizontal displacement of the head was recorded prior to leg movement, it occurred too late to induce deactivation of the hamstring muscles. These results demonstrate that for rapid legs flexion, where the gravity forces are the main source of joint angle acceleration, the deactivation of the SM and ST muscles acts in conjunction with the phasic activation of the TA. The preprogrammed deactivation of the SM and ST muscles represents the early phase of the central command to switch from the standing to the squatting posture." @default.
• W1507657394 created "2016-06-24" @default.
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• W1507657394 date "1997-02-01" @default.
• W1507657394 modified "2023-09-23" @default.
• W1507657394 title "Evidence of a preprogrammed deactivation of the hamstring muscles for triggering rapid changes of posture in humans" @default.
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• W1507657394 doi "https://doi.org/10.1016/s0924-980x(96)96544-3" @default.
• W1507657394 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9118840" @default.
• W1507657394 hasPublicationYear "1997" @default.
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