SUMMARY
Objective. This paper aims to answer the following question: “Do the endurance and rest times defined in the studies prevent the physiological fatigue and its central and peripheral aspects?”.
Methods. 16 muscles activity are recorded from 14 healthy men (23-29 years) during maximum lumbar isometric extension in different postures (30 trials). The electromyography linear analysis (root-mean-square (RMS) and median-frequency (MDF)) is performed to investigate the physiological fatigue. Non-linear analysis is also used to examine the central (fractal-dimension (FD)) and peripheral (recurrence-quantification-analysis (RQA)) aspects. The relationship between FD and RQA is evaluated through t-tests in each muscle, separately.
Results. The FD in all trials is above 1.9, and RQA average is equal to 0.198 ± 0.057.
There is a possibility of fatigue for one muscle in two subjects and its type is peripheral; t-test show a significant difference between FD and RQA in all muscles (p = 0.000).
Conclusions. The fatigue possibility increases during consecutive tasks. Thus, we suggest that in the case of consecutive trials, it is better to choose a longer rest time than what suggested in endurance time studies to prevent from physiological fatigue.
Besides, the RQA and FD schemes are suitable for investigation of the peripheral and central fatigue, respectively.
Electromyography Linear and Non-Linear Analyzing to Evaluation of the Rest Times Adequacy between 30 Lumbar Extension Tests for Fatigue Prevention
Sharareh Kian-Bostanabad, Mahmoodreza Azghani, Mohammad Parnianpour
Original Article, 586-592
Keywords: electromyography, endurance time, physiological fatigue, relaxation allowance, rest time,
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