Age and activity status affect muscle reoxygenation time after maximal cycling exercise.

Published

Journal Article

PURPOSE: The purpose of this study was to determine the interaction of age and habitual physical activity on recovery time of muscle oxygenation following maximal cycling exercise (CycEXmax). METHODS: Twelve sedentary middle-aged (50+/-6), 13 sedentary elderly (66+/-3), 13 active middle-aged (53+/-5), and 20 active elderly (67+/-5) women participated in this study. We evaluated the peak pulmonary oxygen uptake (VO2peak) during CycEXmax and the half-recovery time of muscle oxygenation (T1/2reoxy time) using near-infrared spectroscopy at the vastus lateralis (VL) during the recovery phase after CycEXmax. RESULTS: T1/2reoxy time was significantly greater in the elderly subjects than in the middle-aged subjects in both sedentary (P<0.05) and active groups (P<0.01). T1/2reoxy time of the active group was lower (P<0.01) than that of the sedentary group regardless of age. Age was significantly correlated to T1/2reoxy time in both sedentary and active groups (in both sedentary and active groups: P<0.01). The slope of T1/2reoxy time against age in the sedentary group was significantly greater (VL: P<0.05) than that of the active group. VO2peak showed significant inverse correlation with T1/2reoxy time at the VL in both sedentary and active groups. The slope of VO2peak against T1/2reoxy time showed no significant differences between middle-aged and elderly subjects. CONCLUSION: The results of this study suggest that T1/2reoxy time was prolonged with aging, regardless of habitual physical activity levels. However, habitual physical activity may prevent the age-related prolongation in T1/2reoxy time after CycEXmax. VO2peak appears to be one of the major factors determining T1/2reoxy time, not age.

Full Text

Duke Authors

Cited Authors

  • Ichimura, S; Murase, N; Osada, T; Kime, R; Homma, T; Ueda, C; Nagasawa, T; Motobe, M; Hamaoka, T; Katsumura, T

Published Date

  • July 2006

Published In

Volume / Issue

  • 38 / 7

Start / End Page

  • 1277 - 1281

PubMed ID

  • 16826024

Pubmed Central ID

  • 16826024

Electronic International Standard Serial Number (EISSN)

  • 1530-0315

International Standard Serial Number (ISSN)

  • 0195-9131

Digital Object Identifier (DOI)

  • 10.1249/01.mss.0000227312.08599.f1

Language

  • eng