“…The extent of notable changes in the muscle oxygenation levels measured with NIRS indicators in response to various physiological stressors (hypoxia, exercise intensity, exercise profile, training) was investigated in the following cases: repeated sprint training [14,15,34,107,157,165,168,172,188,191,192], high-intensity interval training [15,25,43,137,157,164,184], voluntary hypoventilation at low lung volume versus normal breathing [17,34,88,89,151], inspiratory muscle training/pre-activation [45,97,100,112,113,140,152,181,187], blood flow restriction [12,14,147,149,191,192], intermittent bilateral cuff inflation of lower limbs with three 5/10-min ischemia-reperfusion cycles [53], hypoxia (normo-and hypo-baric) [14, 35, 59, 72, 76, 77, 90, 108, 123, 129, 130, 137, 142, 148-150, 168, 188, 191, 192, 200], ischemic preconditioning [38,46,…”