A maximal isokinetic pedalling exercise for EMG normalization in cycling |
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| Authors: | Eneko Fernández-Peña Francesco Lucertini Massimiliano Ditroilo |
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| Institution: | 1. Department of Physical Medicine and Rehabilitation, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung 404, Taiwan;2. School of Medicine, Tzu Chi University, Hualien 970, Taiwan;3. Center of General Education, National Taichung University of Science and Technology, Taichung 404, Taiwan;4. Department of Physical Medicine and Rehabilitation, TaichungVeterans General Hospital, Taichung 407, Taiwan;5. Department of Food and Nutrition, Providence University, Taichung 433, Taiwan;6. Cycling & Health Tech Industry R&D Center, Taichung 407, Taiwan;7. Department of Medical Research, Taichung Veterans General Hospital, Taichung 407, Taiwan;8. Division of Endocrinology and Metabolism, Department of Internal Medicine, TaichungVeterans General Hospital, Taichung 407, Taiwan;9. School of Medicine, National Yang-Ming University, Taipei 112, Taiwan;10. School of Medicine, Chung Shan Medical University, Taichung 402, Taiwan |
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| Abstract: | An isometric maximal voluntary contraction (iMVC) is mostly used for the purpose of EMG normalization, a procedure described in the scientific literature in order to compare muscle activity among different muscles and subjects. However, the use of iMVC has certain limitations. The aims of the present study were therefore to propose a new method for the purpose of EMG amplitude normalization in cycling and assess its reliability. Twenty-three cyclists performed 10 trials of a maximal isokinetic protocol (MIP) on a cycle ergometer, then another four sub-maximal trials, whilst the EMG activity of four lower limbs muscles was registered. During the 10 trials power output (CV = 2.19) and EMG activity (CV between 4.46 and 8.70) were quite steady. Furthermore, their maximal values were reached within the 4th trial. In sub-maximal protocol EMG activity exhibited an increase as a function of exercise intensity.MIP entails a maximal dynamic contraction of the muscles involved in the pedalling action and the normalization session is performed under the same biomechanical conditions as the following test session. Thus, it is highly cycling-specific.MIP has good logical validity and within-subject reproducibility. Three trials are enough for the purpose of EMG normalization in cycling. |
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