Alterations in Surface Electromyography of the Upper Leg Muscles at Specified Respiratory Exchange Ratio Thresholds Ranges During a Maximal Exercise Test. RSP [Internet]. 2021 May 27 [cited 2026 May 14];1(1). Available from: https://researchdirects.com/index.php/strengthandperformance/article/view/semgandphysiology