The reliability of determining the onset of medial gastrocnemius muscle activity during a stretch-shorten-cycle action |
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| Affiliation: | 1. Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;2. Department of Physics, Fatima Mata National College, Kollam, Kerala, India;3. Department of Physics, TKM College of Arts and Science, Kollam, Kerala, India;4. King Abdullah Institute for Nanotechnology (KAIN), King Saud University, Riyadh 11451, Saudi Arabia;5. University of Antwerp, Chemistry Department, Universiteitsplein 1, B2610 Antwerp, Belgium;6. Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;1. School of Materials Science and Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India;2. Department of Chemistry, University of Pune, Ganeshkhind, Pune 411007, India;1. State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, No. 61, Daizong Street, Tai’an 271018, Shandong, PR China;2. Department of Garden Engineering, Heze University, Heze 274015, Shandong, PR China |
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| Abstract: | The instant at which a muscle increases its level of activity from baseline represents the onset of muscle activity. Accurate identification of muscle onset allows determination of temporal and amplitude characteristics of the surface electromyography (sEMG) signal. This investigation determined the intra- and inter-tester reliability for determining the onset of medial gastrocnemius (MG) activity using visual and automated methods. One hundred hop cycles, performed at 2.2 Hz, were selected from sEMG recordings (bandpass filtered 50–500 Hz and full wave rectified) of ten participants who performed three trials of single-leg hopping. The onset of MG muscle activity was identified by 3 separate investigators on two separate occasions and an automated method (10% of the peak activation amplitude). The duration of the anticipatory period, from muscle onset to initial ground contact, was then determined. Intra-tester (ICC from 0.72 to 0.95) and inter-tester reliability (ICC from 0.70 to 0.88) were high as was comparison to the automated method (ICC = 0.90). These findings indicate that visual onset detection was highly reproducible between testing sessions, independent investigators and comparable to an automated method. These methods may be used reliably to determine the onset of MG muscle activity during a stretch-shorten-cycle muscle action. |
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| Keywords: | Reproducibility Muscle activation Anticipatory response Electromyography |
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