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Effect of Aerobic Exercise Training on Ventilatory Efficiency and Respiratory Drive in Obese Subjects.

BACKGROUND: Obese patients show a decline in exercise capacity and diverse degrees of dyspnea in association with mechanical abnormalities, increased ventilatory requirements secondary to the increased metabolic load, and a greater work of breathing. Consequently, obese patients may be particularly...

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Published in:Respiratory Care Vol. 62; no. 7; pp. 936 - 947
Main Authors: Chlif, Mehdi, Chaouachi, Anis, Ahmaidi, Said
Format: research tables/charts Journal Article
Published: Mary Ann Liebert, Inc. Jul2017
Online Access:View this record in EBSCOhost
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      dt: Jul2017
      vid: 62
      iid: 7
      pid: 1365
      pub: Mary Ann Liebert, Inc.
      place: New Rochelle, New York
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        123919099
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        10.4187/respcare.04923
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        atl: Effect of Aerobic Exercise Training on Ventilatory Efficiency and Respiratory Drive in Obese Subjects.
      aug:
        au:
          Chlif, Mehdi
          Chaouachi, Anis
          Ahmaidi, Said
        affil: EA-3300: APERE, Exercise Physiology and Rehabilitation Laboratory, Picardie Jules Verne University, Sport Sciences Department, Avenue Paul Claudel, F-80025, Amiens Cedex, France
      sug:
        subj:
          Aerobic Exercises
          Obesity
          Respiration Evaluation
          Human
          Descriptive Statistics
          P-Value
          Male
          Anthropometry
          Spirometry
          Dyspnea
          Scales
          Pretest-Posttest Design
          Oxygen Consumption
          Pressure (Physiology)
          Respiratory Muscles Analysis
          Exercise Tolerance
          France
          Respiratory Function Tests
          Exercise Test, Cardiopulmonary
          Paired T-Tests
          Wilcoxon Signed Rank Test
          Friedman Test
          Post Hoc Analysis
          Analysis of Variance
          Pulmonary Gas Exchange
          Physical Endurance
          Male
      ab: BACKGROUND: Obese patients show a decline in exercise capacity and diverse degrees of dyspnea in association with mechanical abnormalities, increased ventilatory requirements secondary to the increased metabolic load, and a greater work of breathing. Consequently, obese patients may be particularly predisposed to the development of respiratory muscle fatigue during exercise. The aim of this study was to assess inspiratory muscle performance during incremental exercise in 19 obese male subjects (body mass index 41 ± 6 kg/m²) after aerobic exercise training using the noninvasive, inspiratory muscle tension-time index (TT0.1). METHODS: Measurements performed included anthropometric parameters, lung function assessed by spirometry, rate of perceived breathlessness with the modified Borg dyspnea scale (0-10), breathing pattern, maximal exercise capacity, and inspiratory muscle performance with a breath-by-breath automated exercise metabolic system during an incremental exercise test. TT0.1 was calculated using the equation, TT0.1 = P0.1/PImax x TI/Ttot (where P0.1 represents mouth occlusion pressure, PImax is maximal inspiratory pressure, and TI/Ttot is the duty cycle). RESULTS: At rest, there was no statistically significant difference for spirometric parameters and cardiorespiratory parameters between pre- and post-training. At maximal exercise, the minute ventilation, the rate of exchange ratio, the rate of perceived breathlessness, and the respiratory muscle performance parameters were not significantly different pre- and post-training; in contrast, tidal volume (P = .037, effect size = 1.51), breathing frequency (P = .049, effect size = 0.97), power output (P = .048, effect size = 0.79), peak oxygen uptake (P = .02, effect size = 0.92) were significantly higher after training. At comparable work load, training induces lower minute ventilation, mouth occlusion pressure, ratio of occlusion pressure to maximal inspiratory pressure, TT0.1, and rate of perceived breathlessness. CONCLUSIONS: Aerobic exercise at ventilatory threshold can induce significant improvement in respiratory muscle strength, maximal exercise capacity, and inspiratory muscle performance and decreased dyspnea perception in obese subjects.
      pubtype: Academic Journal
      doctype:
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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