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Lactate uptake by inactive forearm during progressive leg exercise

J R Poortmans, J Delescaille-Vanden Bossche, R Leclercq

Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology

|December 1, 1978

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During exercise, nonexercising muscles take up lactate, but this role is small. Lactate removal by these muscles ceases shortly after exercise ends, as shown in male subjects during graded leg exercise.

Area of Science:

Exercise Physiology
Metabolic Biochemistry

Background:

Lactate accumulation during exercise is a key metabolic event.
Understanding lactate kinetics is crucial for exercise performance and recovery.

Purpose of the Study:

To investigate the role of nonexercising muscles in lactate removal during and after exercise.
To quantify the uptake of lactate by resting muscles.

Main Methods:

Studied eleven male subjects during graded leg exercise (60-270 W).
Measured arterial and venous lactate concentrations from the forearm during exercise and recovery.
Analyzed arteriovenous lactate difference to determine net muscle lactate exchange.

Main Results:

Arterial lactate concentration increased progressively during exercise.

Related Experiment Videos

A positive arteriovenous lactate difference indicated net lactate uptake by nonexercising muscles.

Lactate uptake by resting muscle correlated directly with arterial lactate levels.

Significant arteriovenous lactate difference disappeared by 5 minutes into recovery.

Conclusions:

Nonexercising muscles contribute minimally to lactate removal during exercise.
Lactate removal by nonexercising muscles effectively stops soon after exercise cessation.