{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T14:48:43Z","timestamp":1785250123003,"version":"3.55.0"},"reference-count":94,"publisher":"Human Kinetics","issue":"8","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,11,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Study design<\/jats:bold>:<\/jats:italic> Cross-over study. <jats:italic><jats:bold>Context<\/jats:bold>:<\/jats:italic> The squat, single-leg squat, forward lunge, and reverse lunge are fundamental movements often performed in activities of daily living, sports competitions, and sport-specific training. <jats:italic><jats:bold>Objective<\/jats:bold>:<\/jats:italic> The purpose of this study was to investigate the effect of visual feedback with a laser sensor (VFLS) versus a control condition on the myoelectric activity (surface electromyography [sEMG]) of the vastus medialis oblique (VMO), vastus lateralis, gluteus medius (Gmed), and erector spinae muscles during the performance of several squat variations with bodyweight. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Nineteen female college students (20 [2.5]\u00a0y, 165.3 [10.2]\u00a0cm, 66.4 [4.1]\u00a0kg, 2 [1.2]\u00a0y of resistance training experience) with a background in strength or sports training volunteered to participate in this study. Over 4 separate visits, subjects performed 2 sets of 10 repetitions of a squat variation exercise in random order (ie,\u00a0squat, single-leg squat, forward lunge, and reverse lunge). The first set of a given squat variation condition was considered a control set, and then after 3-minute rest, a second set was performed with VFLS. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Significant decreases in VMO and Gmed myoelectric activity were observed during the VFLS set versus the control set for the forward lunge exercise (<jats:italic>P<\/jats:italic>\u2009=\u2009.03). No differences were observed between the control set and VFLS set in the sEMG normalized signal for all muscles analyzed for the squat and single-leg squat, respectively. However, the sample entropy of the sEMG signal for the erector spinae became more irregular during the VFLS set versus the control set for the squat exercise (<jats:italic>P<\/jats:italic>\u2009=\u2009.01), whereas the Gmed presented a more irregular sEMG signal during the VFLS set versus the control set for the single-leg squat (<jats:italic>P<\/jats:italic>\u2009=\u2009.08). <jats:italic><jats:bold>Conclusion<\/jats:bold>:<\/jats:italic> Laser sensor biofeedback may induce significant decreases in VMO and Gmed activation performing forward lunge exercise. Therefore, laser sensor biofeedback may induce a reduction in muscle activity of neutralizers muscles during a few squat bodyweight variations (bilateral, single-leg, forward, and reverse lunge).<\/jats:p>","DOI":"10.1123\/jsr.2019-0194","type":"journal-article","created":{"date-parts":[[2020,1,16]],"date-time":"2020-01-16T04:04:23Z","timestamp":1579147463000},"page":"1159-1165","source":"Crossref","is-referenced-by-count":8,"title":["Myoelectric Responses of Lower-Body Muscles Performing Squat and Lunge Exercise Variations Adopting Visual Feedback With a Laser Sensor"],"prefix":"10.1123","volume":"29","author":[{"given":"Gabriel Andrade","family":"Paz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lohanne","family":"Almeida","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Larissa","family":"Ruiz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabrina","family":"Casseres","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanna","family":"Xavier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo\u00e3o","family":"Lucas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haroldo Gualter","family":"Santana","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Humberto","family":"Miranda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Scott","family":"Bonnette","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey","family":"Willardson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"key":"ref831","first-page":"918","article-title":"Determining the magnitude of treatment effects in strength training research through the use of the effect size","volume":"18","author":"Rhea","year":"2004","journal-title":"J Strength Cond Res"},{"key":"ref621","doi-asserted-by":"crossref","first-page":"649","DOI":"10.1136\/bjsports-2014-094341","article-title":"Clinician-friendly lower extremity physical performance tests in athletes: a systematic review of measurement properties and correlation with injury. 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