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Respiratory Muscle Training Essay

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In highly trained individuals, increased work of breathing, respiratory muscle fatigue and dyspnea at high intensities limits the respiratory system performance. During strenuous exercises, moderately fit subject’s respiratory musculature demands ~10% of the total oxygen consumption (VO2) whereas highly fit subject demands up to 15% of VO2. The exhaustive high-intensity exercise leads to inspiratory, expiratory muscle fatigue as well as diaphragm fatigue (above 85% VO2max or 80% Wmax). Low ability to produce sufficient pressure for making adequate alveolar ventilation leads to inspiratory muscle fatigue.
Endurance exercise performance could be reduced due to the accumulation of lactic acid in the respiratory muscles that triggers an increase in the brain sympathetic outflow. Indeed causing vasoconstriction in the exercising limbs and that consequently increases limb muscle fatigue during exercise and results in earlier exercise termination. Respiratory muscle training is a …show more content…
The twenty physically fit SCUBA divers performed respiratory muscle training at 70-75% VO2max for 3-5 days per week for 4 weeks at 1.22 m depth. This is followed by RRMT 2 d/wk (RRMT-M) to analyze the maintenance effect. Pulmonary function was unchanged, while inspiratory (Pinsp) and expiratory pressure (Pexp), respiratory endurance training (RET) time, surface and underwater swim times were improved. VO2, VE and breathing frequency decreased during the underwater endurance swims. An identical study of RRMT on nine males with 70% max pre determined load at 55 feet of depth (270.5 kPa) suggested that respiratory muscles improved the strength and swimming time to exhaustion ( ̴ 60%, 31.3 ± 11.6 vs. 49.9 ±16.0 min, pre- vs. post-RRMT, p < 0.05). These results were quite equivocal with another study done on 30 male subjects with PRMT, ERMT and RRMT

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