Knowledge Base > Studies & Papers > The Effects of Respiratory Muscle Training on Maximal and Submaximal Cardiovascular and Pulmonary Measurements

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This study evaluated the effect of inspiratory and expiratory muscle training on pulmonary function, maximal, and sub-maximal exercise performance. Specifically, how does training using a PowerLung resistive device effect exercise performance and pulmonary function in competitive marathoners and triathletes. The participants in this study (N=12) had a mean weekly aerobic training time of 7.5 hours per week of swimming, cycling, or running. Eight subjects were assigned to a PowerLung treatment group and four control subjects were given a sham device that allowed no greater than 15% resistance on inspiration or expiration. The subjects performed 30 maximal inhalation/exhalation maneuvers on their respective devices two times per day for four weeks. The subjects were tested for forced vital capacity (FVC), forced expiratory volume in one second (FEV1), FEV1/FVC ratio, forced inspiratory vital capacity (FIVC), peak inspiratory flow rate (PIFR), and peak expiratory flow rate (PEFR). Each subject was also tested for peak exhalation force test (Pex) as well as a maximal oxygen consumption (VO2max), carbon dioxide production (VCO2), tidal volume (VT), ventilation (VE), lactate threshold (LT), and respiration rate (RR). The subjects also completed weekly sub-maximal exercise test at 85% of their VO2max with exercise time, VO2, VCO2, VE, VT, and RR being measured. The data revealed that training using the Powerlung device produced significant changes in maximal VE, maximal VT, and sub-maximal VE. There were no significant effects on VO2max, sub-maximal exercise time, FVC, FEV1, FIVC, PEFR, or LT. The study revealed a 1.99 breath/minute decrease in RR coupled with a 4.93 L/min increase in VE and a .81L/breath increase in VT for the treatment group. Subjects in the treatment group also had a 28.25mm/Hg increase in Pex as compared to only a 2mm/Hg increase for the control group.
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