Another recently introduced method is the measurement of muscle oxygen saturation using near-infrared spectroscopy (NIRS), a metric that may be related to fatigue [ 21 ], due to reports that muscle oxygen saturation (SmO 2 ) shows a decreasing trend after a muscle strength protocol [ 22 ].
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Acute Effect of Fixed vs. Self-Selected Rest Interval Between Sets on Physiological and Performance-Related Responses.
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