4.2. Inspiratory Muscle Performance and Resistance to Fatigue
respiratory muscle, inspiratory muscle blood flow, fatigue, Fatigue
Fatigue is the most common sensation everyone can physiologically experience during physical activity and the main exercise-limiting factor [In the present investigation, we assumed that increasing inspiratory muscle blood flow and oxygen delivery via short-term L-citrulline supplementation would positively affect respiratory muscle performance and resistance to fatigue. To investigate this hypothesis, we examined respiratory muscle performance at rest and after a fatiguing incremental resisting breathing protocol to task failure. As expected, resistive breathing to task failure was effective in causing a drop in the participants’ respiratory performance and severe fatigue. The MIP was significantly lower after the breathing test. Moreover, the perceived exertion score was significantly higher, and the number of breaths at exhaustion during the last stage was significantly lower. However, even though NO