Abstract
Background: Recent innovations in surface electromyographic (sEMG) technology have enabled the measurement of muscle activity using smart textiles. Objective: In this study, the StriveTM Sense3 performance monitoring system is evaluated against a research-grade system, NoraxonTM, in measuring activity during the back squat exercise. Method: Seventeen participants performed three total trials of the squat exercise with a progressive load for individual trials equal to 30%, 60%, and 80% of their estimated maximum 1RM (one-repetition maximum). sEMG measurements from the rectus femoris were captured for the left and right leg by both systems. Pearson product-moment correlation coefficient (r) and intraclass correlation coefficient (ICC) values were computed for each trial to assess concurrent validity and interrater reliability of the StriveTM Sense3 device. Additionally, five coaches at the collegiate- and professional-level of Men’s Basketball speak from an autoethnographic frame to the findings from this study. Results: Results ranged from “Poor” to “Excellent” validity and “Poor to Moderate” to “Excellent” reliability, with a majority of trials achieving “Good” or better results across all loads [93% trials: r >= 0.7; 87% trials: lower ICC 95% CI bound >= 0.75 (absolute sEMG); 98% trials: lower ICC 95% CI bound >= 0.75 (normalized sEMG)]. Higher validity and reliability for medium and heavy loads were observed in comparison to the light load, and several outliers indicate the need for coaches to lubricate sensors and ensure proper fit to collect accurate data. Conclusion: Examining results alongside practitioner feedback indicate the StriveTM Sense3 system is capable of tracking sEMG activity in comparison to a research-grade system.
Highlights
The generalized aims of electromyography (EMG) are to analyze the function and coordination of muscles during different movements and activities, in different populations, under laboratory conditions as well as during activities of daily living (Clarys, 2000)
Though this study is the first of its kind in comparing two forms of Surface EMG (sEMG) concurrently over a progressive load during the squat exercise, previous research indicates that overall sEMG output increases with higher loads, consequentially supporting the notion that there is a greater amount of muscle activity to detect at higher loads (Alkner et al, 2000)
While further validation is always recommended and will be conducted by this research team, the results of this study presently demonstrate that the StriveTM Sense3 can be a valid and reliable device for measuring sEMG responses without the challenges of expecting student- or professional-athletes to conduct training movements within the confines of a laboratory and at the expense of keeping sEMG electrodes attached
Summary
The generalized aims of electromyography (EMG) are to analyze the function and coordination of muscles during different movements and activities, in different populations, under laboratory conditions as well as during activities of daily living (Clarys, 2000). Multiple systems exist for both surface and intramuscular EMG to assess muscle activation (Massó et al, 2010), each with their own advantages and disadvantages. Intramuscular EMG is generally used in clinical settings and is considered more precise, but since a needle electrode is required, it is invasive and sometimes painful to the wearer (Massó et al, 2010). Surface EMG (sEMG) requires more skin preparation and accurate positioning to avoid muscle cross-talk but has the advantage of being. Objective: In this study, Accepted: October 06, 2020 Published: October 31, 2020 Volume: 8 Issue: 4 the StriveTM Sense performance monitoring system is evaluated against a research-grade system, NoraxonTM, in measuring activity during the back squat exercise. Method: Seventeen participants performed three total trials of the squat exercise with a progressive load for individual trials equal to 30%, 60%, and 80% of their estimated maximum 1RM
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