NDLI: Effect of prior heavy exercise on muscle deoxygenation kinetics at the onset of subsequent heavy exercise

Content Provider	SpringerLink
Author	Marles, A. Perrey, S. Legrand, R. Blondel, N. Delangles, A. Betbeder, D. Mucci, P. Prieur, F.
Copyright Year	2007
Abstract	This study examines the effect of prior heavy exercise on muscle deoxygenation kinetics at the onset of heavy-intensity cycling exercise. Ten young male adults (20 ± 2 years) performed two repetitions of step transitions (6 min) from 35 W to heavy-intensity exercise preceded by either no warm-up or by a heavy-intensity exercise. $${\dot{{V}}\hbox{O}_{2}}$$ was measured breath-by-breath, and muscle deoxygenation (HHb) and total hemoglobin (Hbtot) were monitored continuously by near-infrared spectroscopy. We used a two-exponential model to describe the $${\dot{{V}}\hbox{O}_{2}}$$ kinetics and a mono-exponential model for the HHb kinetic. The parameters of the phase II $${\dot{{V}}\hbox{O}_{2}}$$ kinetics $${(\hbox{TD}_{1} \dot{{V}}\hbox{O}_{2}, \tau_{1}\dot{{V}}\hbox{O}_{2}}$$ and $${\hbox{A}_{1} \dot{{V}}\hbox{O}_{2}}$$ ) were unaffected by prior heavy exercise, while some parameters of local muscle deoxygenation kinetics were significantly faster (TD HHb: 7 ± 2 vs. 5 ± 2 s; P < 0.001, MRT HHb: 20 ± 3 vs. 15± 4 s; P < 0.05). Blood lactate, heart rate and Hbtot values were significantly higher before the second bout of heavy exercise. These results collectively suggest that the prior heavy exercise probably increased muscle O2 availability and improved O2 utilization at the onset of a subsequent bout of heavy exercise.
Starting Page	677
Ending Page	684
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	99
Issue Number	6
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-23
Publisher Place	Berlin/Heidelberg
Access Restriction	Subscribed
Subject Keyword	Near infrared spectroscopy $${\dot{{V}}\hbox{O}_{2}}$$ kinetics Muscle oxygen utilization Prior exercise Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Sports Science Orthopedics and Sports Medicine Physiology (medical)

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