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Updated: Jun 13, 2026

Procedures for Rat in situ Skeletal Muscle Contractile Properties
Published on: October 15, 2011
[The sEMG-force relationship during ramp contractions of biceps brachii in non-fatigue exercises]
Chao Song1, Jian Wang, Lan-ping Lou
1Institute of Psychology, Zhejiang Sci-Tech University, Hangzhou 310018, China. flex1028@zstu.edu.cn
Objective:
To evaluate the capability of C(N) and determinism% (DET%) together with the linear indices, we detected the surface electromyography (sEMG) signal changes during ramp contractions of biceps brachii.
Methods:
5 seconds sEMG signals of 11 male volunteers were recorded to analyze its changes of the linear indices AEMG, mean power frequency(MPF), MF and the non-linear indices C (N), DET%.
Results:
Average electromyography (AEMG) inclined linearly from 112.14 microV to 1277.18 microV while DET% displayed an decrease from 74.95 to 46.7 during the 5 voluntary contractions. The spectrum parameters MPF/MF and C(N) leveled off with the increasing of the force.
Conclusion:
The linear index AEMG inclined linearly while MPF and MF leveled off with the increasing of the force. The non-linear index DET% declined while C(N) leveled off during the 5 seconds ramp contractions.
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