Muscle lactate metabolism in recovery from intense exhaustive exercise: impact of light exercise.
This study examined the effect of low-intensity exercise on lactate metabolism during the first 10 min of recovery from high-intensity exercise. Subjects exercised (61.0 +/- 5.4 W) one leg to exhaustion (approximately 3.5 min), and after 1 h of rest they performed the same exhaustive exercise with the other leg. For one leg the intense exercise was followed by rest [passive (P) leg], and for the other leg the exercise was followed by a 10-min period with low-intensity exercise at a work rate of 10 W [active (A) leg]. The muscle lactate concentration after the intense exercise was the same in the P and A legs, but after 10 min of recovery, the lactate concentration and the arterial blood lactate level were higher for the P leg than for the A leg (both P < 0.05). During the recovery, the mean blood flow was lower for the P leg than for the A leg (P < 0.05), whereas the mean lactate efflux was not significantly different. During the 10 min of recovery, lactate release accounted for approximately 60% of the change in muscle lactate for either leg. The leg excess postexercise O2 consumption during 10 min of recovery was 440 and 750 ml for the P and A legs, respectively. The present data suggest that a lowered blood lactate level during active recovery is due to an elevated muscle lactate metabolism and is not caused by a transient higher release of lactate from the exercising muscles coupled with greater uptake in other tissues.(ABSTRACT TRUNCATED AT 250 WORDS)
Copenhagen Muscle Research Center, August Krogh Institute, University of Copenhagen, Denmark.
J
J
Bangsbo
T
T
Graham
L
L
Johansen
B
B
Saltin
D000255:Adenosine Triphosphate / Q000378:metabolism; D000328:Adult; D001783:Blood Flow Velocity; D001784:Blood Gas Analysis; D002851:Chromatography, High Pressure Liquid; D015444:Exercise / Q000502:physiology*; D005947:Glucose / Q000378:metabolism; D006003:Glycogen / Q000378:metabolism; D006801:Humans; D007291:Inosine Monophosphate / Q000378:metabolism; D007773:Lactates / Q000097:blood / Q000378:metabolism*; D019344:Lactic Acid; D007866:Leg / Q000098:blood supply* / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism*; D010101:Oxygen Consumption; D010725:Phosphocreatine / Q000378:metabolism; D013053:Spectrophotometry
D007773:Lactates; D010725:Phosphocreatine; D007291:Inosine Monophosphate; D019344:Lactic Acid; D000255:Adenosine Triphosphate; D006003:Glycogen; D005947:Glucose