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Τετάρτη 26 Ιουλίου 2017

Respiratory muscle endurance training reduces the O2 cost of cycling and perceived exertion in obese adolescents.

In obesity the increased O2 cost of breathing negatively affects the O2 cost of exercise and exercise tolerance. The purpose of the study was to determine whether, in obese adolescents, the addition of respiratory muscle endurance training (RMET) (isocapnic hyperpnea) to a standard body mass reduction program decreases the O2 cost of exercise and perceived exertion and increases exercise tolerance. 9 male obese adolescents (16.0±1.4 years [x±SD], body mass 114.4±22.3 kg) underwent 3 weeks of RMET (5 days/week); 8 age-and sex- matched obese adolescents underwent the standard body mass reduction program (CTRL). Before and after interventions patients performed on a cycle ergometer: incremental exercise; 12-min constant work-rate exercises (CWR) at 65% and 120% of gas exchange threshold (GET) determined before the intervention. Breath-by-breath pulmonary ventilation (V'E) and O2 uptake (V'O2), heart rate (HR) and ratings of perceived exertion for dyspnea/respiratory discomfort (RPER) and leg effort (RPEL) were determined. Body mass decreased (by ~3.0 kg) after both RMET and CTRL (P=0.001; GLM for repeated measures). Peak O2 and peak work rate were not affected by both interventions. During CWR<GET no changes were observed after both interventions. During CWR>GET the O2 cost of cycling (P=0.014), the slope of V'O2 vs. time (P=0.012), RPER (P=0.012), RPEL (P=0.016) and HR (P=0.001) decreased following RMET but not following CTRL, whereas V'E did not change. In obese adolescents RMET, superimposed on a standard body mass reduction program, lowered the O2 cost of cycling and perceived exertion during constant heavy-intensity exercise.



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