Prior Maximal Exercise Decreases Pulmonary Diffusing Capacity during Subsequent Exercise

J. C. Baldi; M. J. Dacey; M. J. Lee; J. R. Coast

doi:10.1055/s-0034-1372635

International Journal of Sports Medicine, Table of Contents

Int J Sports Med 2014; 35(12): 982-986
DOI: 10.1055/s-0034-1372635

Physiology & Biochemistry

Prior Maximal Exercise Decreases Pulmonary Diffusing Capacity during Subsequent Exercise

J. C. Baldi

¹Medicine, University of Otago, Dunedin, New Zealand

,

M. J. Dacey

²Biological Sciences, Northern Arizona University, Flagstaff, United States

,

M. J. Lee

²Biological Sciences, Northern Arizona University, Flagstaff, United States

,

J. R. Coast

²Biological Sciences, Northern Arizona University, Flagstaff, United States

› Author Affiliations

Abstract

Pulmonary diffusion (D_LCO) increases during exercise due to greater pulmonary capillary volume (Vc) and membrane diffusing capacity (D_M). However, after heavy exercise there is a reduction in resting D_LCO. It is unclear whether this post-exercise effect will attenuate the normal increase in D_LCO, V_c and D_M during subsequent exercise and whether this affects SpO₂ (pulse oximeter). D_LCO, V_c, D_M, cardiac output and SpO₂ were measured at rest, moderate (~70% VO_2peak) and heavy (~90 VO_2peak) exercise in 9 subjects during 2 sessions separated by ~90 min. D_LCO, V_c and D_M increased during exercise (P<0.05). D_LCO (P<0.05) and V_c (P<0.10), but not D_M or SpO₂ were lower in session 2 compared to the first. Reductions in D_LCO and Vc appeared to be smallest during rest (1–4%) and greatest at high-intensity exercise (8–20%), but the interaction was not significant. SpO₂ decreased by 4.9% and 5.1% from rest to high-intensity exercise during the first and second exercise bout, but these changes were not different. These data confirm that a bout of high-intensity exercise reduces D_LCO and V_c, and may indicate that these changes are exacerbated during subsequent high-intensity exercise. Despite these changes, SpO₂ was not affected by previous exercise.

Key words

fatigue - diffusing capacity - pulmonary - altitude - exercise - cardiac output

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References

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