Long-Term Alterations in Pulmonary VËO2 and Muscle Deoxygenation On-Kinetics During Heavy-Intensity Exercise in Competitive Youth Cyclists: A Cohort Study.
Pediatr Exerc Sci
; : 1-7, 2024 May 07.
Article
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| MEDLINE
| ID: mdl-38714302
ABSTRACT
PURPOSE:
The aim of this investigation was to assess alterations of pulmonary oxygen uptake (VËO2) and muscle deoxygenation on-kinetics during heavy-intensity cycling in youth cyclists over a period of 15 months.METHODS:
Eleven cyclists (initial age, 14.3 [1.6] y; peak VËO2, 62.2 [4.5] mL·min-1·kg-1) visited the laboratory twice on 3 occasions within 15 months. Participants performed an incremental ramp exercise test and a constant workrate test within the heavy-intensity domain during the first visit and second visit, respectively. Subsequently, parameter estimates of the VËO2 and muscle deoxygenation on-kinetics were determined with mono-exponential models.RESULTS:
The VËO2 phase II time constant decreased from occasion 1 (34 [4] s) to occasion 2 (30 [4] s, P = .005) and 3 (28 [4] s, P = .010). However, no significant alteration was observed between occasions 2 and 3 (P = .565). The VËO2 slow component amplitude either expressed in absolute values (ie, L·min-1) or relative to end exercise VËO2 (ie, %) showed no significant changes throughout the study (P = .972 and .996). Furthermore, the muscle deoxygenation on-kinetic mean response time showed no significant changes throughout the study (18 [8], 18 [3], and 16 [5] s for occasions 1, 2, and 3, respectively; P = .279).CONCLUSION:
These results indicate proportional enhancements of local muscle oxygen distribution and utilization, which both contributed to the speeding of the VËO2 on-kinetics herein.
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MEDLINE
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En
Año:
2024
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Article