Delayed appearance of blood lactate with reduced frequency breathing during exercise

  • Y. Yamamoto
  • Y. Takei
  • Y. Mutoh
  • M. Miyashita
Article

Summary

The purpose of the present study was to investigate the blood lactate (LA) responses to hypoventilation induced by reduced frequency breathing (RFB) during recovery from exercise. Five male subject performed 16 4 min cycling bouts alternating with 16 min rest periods. Exercise intensities were chosen at power outputs corresponding to 30% \(\dot V_{{\text{O}}_{{\text{2 max}}} } \) at 2mMLA, \(\dot V_{{\text{O}}_{\text{2}} } \) at 4 mMLA, and 90% \(\dot V_{{\text{O}}_{{\text{2 max}}} } \) in each subject. Breathing frequency was voluntarily controlled starting 10 s before each 3rd min of exercise and maintained throughout the rest of the exercise period. Four different breathing patterns at each exercise intensity were used: normal breathing (NB), breathing every 4 s, breathing every 8 s, and maximal RFB. Except for the NB trials, subjects held their breath at functional residual capacity during each breathing interval. The concentration difference of LA between the 3rd min sample and the 4th min sample was defined as the lactate change during exercise (Δ LAex), and that between the 4th min sample and the sample at the 3rd min after the end of the exercise as the lactate change during recovery (Δ LArec). An ANOVA showed significant (p<0.05) differences in breathing procedures only in ΔLArec. ΔLArec seemed to increase as compared to NB only at \(\dot V_{{\text{O}}_{\text{2}} } \) at 4 mMLA and 90% \(\dot V_{{\text{O}}_{{\text{2 max}}} } \), while ΔLAex remained unchanged as compared to NB in spite of reduced ∵VA. These results might indicate that RFB inhibited lactate removal from working muscles during exercise.

Key words

Reduced frequency breathing Hypoventilation Lactate removal Human 

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Y. Yamamoto
    • 1
  • Y. Takei
    • 1
  • Y. Mutoh
    • 1
  • M. Miyashita
    • 1
  1. 1.Laboratory for Exercise Physiology and Biomechanics, Faculty of EducationUniversity of TokyoBunkyo-kuJapan

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