NDLI: Effects of recovery time on phosphocreatine kinetics during repeated bouts of heavy-intensity exercise

Content Provider	Springer Nature Link
Author	Forbes, S. C. Raymer, G. H. Kowalchuk, J. M. Thompson, R. T. Marsh, G. D.
Copyright Year	2008
Abstract	The purpose of this study was to examine the kinetics of phosphocreatine (PCr) breakdown in repeated bouts of heavy-intensity exercise separated by three different durations of resting recovery. Healthy young adult male subjects (n = 7) performed three protocols involving two identical bouts of heavy-intensity dynamic plantar flexion exercise separated by 3, 6, and 15 min of rest. Muscle high-energy phosphates and intracellular acid-base status were measured using phosphorus-31 magnetic resonance spectroscopy. In addition, the change in concentration of total haemoglobin (Δ[Hbtot]) and deoxy-haemoglobin (Δ[HHb]) were monitored using near-infrared spectroscopy. Prior exercise resulted in an elevated (P < 0.05) intracellular hydrogen ion ([H+]i) after 3 min (182 ± 72 (SD) nM; pH 6.73) and 6 min (112 ± 19 nM; pH 6.95) but not after 15 min (93 ± 8 nM; pH 7.03) compared to pre-exercise in Con (90 ± 3 nM; pHi 7.05). The on-transient time constant (τ) of the PCr primary component was not different amongst the exercise bouts. However, in each of the subsequent bouts the amplitude of the PCr slow component, total PCr breakdown, and rise in [H+]i were reduced (P < 0.05). At exercise onset, Δ[Hbtot] was increased (P < 0.05) and the Δ[HHb] kinetic response was slowed (P < 0.05) in the exercise after 3 min, consistent with improved muscle perfusion. In summary, neither the level of acidosis or muscle perfusion at the onset of exercise appeared to be directly related to the time course of the on-transient PCr primary component or the magnitude of the PCr slow component during subsequent bouts of exercise.
Starting Page	665
Ending Page	675
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	103
Issue Number	6
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-05-15
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acidosis Skeletal muscle energetics Magnetic resonance spectroscopy Prior exercise Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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