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RESTING MECHANOMYOGRAPHIC AMPLITUDE FROM THE VASTUS LATERALIS MUSCLE IN DIFFERENT POSTURAL RESTING POSITIONS FOLLOWING AEROBIC EXERCISE

Nathan P. Wages, Travis W. Beck, Xin Ye, Joshua C. Carr, Cody A. Miller

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Purpose: To evaluate the post-exercise time course for muscle relaxation and recovery following aerobic exercise in different postural resting positions between the dominant and non-dominant vastus lateralis muscles. Methods: Subjects exercised on an upright cycle ergometer, using only their dominate leg, for 2[Formula: see text]min at 30% VO2 peak. Following this warm-up, subjects then cycled for 30[Formula: see text]min at 60% VO2 peak. After the aerobic phase, subjects cooled down for 2[Formula: see text]min at 30% VO2 peak. Resting mechanomyographic amplitude was measured prior to and following aerobic exercise. Results: There was an approximate [Formula: see text] and [Formula: see text] decrease (upright sitting position with the subject’s knee joint angle fixed at 180[Formula: see text]) and an approximate [Formula: see text] and [Formula: see text] decrease (upright sitting position with the subject’s knee joint angle fixed at 90[Formula: see text]) in normalized mechanomyographic amplitude after aerobic exercise for the dominant and non-dominate vastus lateralis muscles, respectfully. Conclusion: There appears to be a potential cross-over relaxation effect during the sitting postural positions, but not during the lying supine postural positions. Furthermore, it appears that the relaxation from the dominant vastus lateralis muscle potentially influenced the increased relaxation of the non-dominant vastus lateralis muscle.