Breathing Patterns do not Influence Coordination between Breathing and Low or Moderate Intensity Exercise Rhythms

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  • 低強度および中強度下肢運動時の呼吸様式の違いは運動 - 呼吸同調に影響を与えない

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Abstract

Purpose: To alleviate dyspnea, physical therapists often instruct patients with chronic lung disease to do diaphragmatic breathing and coordination between their breathing and exercise rhythms. However, the relationship between breathing patterns and exercise coordination remains unknown. This study aimed to investigate the influence of two breathing patterns on coordination between breathing and exercise rhythms. <br>Methods: Incremental exercise testing was performed with a ergometer in 10 healthy male subjects and ventilatory threshold (VT) determined. Exercise intensity was defined as according with two workloads corresponding to 60%VT and 100%VT, respectively. Subjects used two breathing patterns, spontaneous and diaphragmatic. Subjects cycled four different exercise protocols for 6 minutes (two intensities and two breathing patterns). During cycling, leg movements, respiratory parameters and thoracoabdominal perimeters were continuously recorded. Coordination was considered to be present when the phase interval between the leg movement cycle and inspiration (or expiration) displayed a constant value ± 0.10 seconds for at least four consecutive breaths. <br>Results: The degree of coordination (%COORD) wasn't significantly different between the two breathing patterns. When breathing and cycling rhythms were coordinated, oxygen uptake was significantly higher than when not coordinated at workloads of 60%VT with spontaneous breathing (p < 0.05). However, between group differences for all other exercise parameters were not significant. Nor was there significant coordination between %COORD and oxygen uptake, and %COORD and oxygen equivalent. <br>Conclusion: These results suggested that breathing control does not affect %COORD, and that coordination between breathing and cycling rhythms does not necessarily cause a reduction in oxygen uptake at workloads corresponding to 60-100%VT.

Journal

  • Physical Therapy Japan

    Physical Therapy Japan 36 (7), 341-347, 2009-12-20

    Japanese Society of Physical Therapy

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