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K+ balance in humans during exercise

¹Norwegian University of Sport and Physical Education, Oslo, Norway.

Acta Physiologica Scandinavica

|March 1, 1996

Summary

Exercise increases plasma potassium ([K+]) levels, especially at high intensities. While the adrenergic system influences whole-body potassium balance during exercise, its precise role within exercising muscles remains unclear.

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Area of Science:

Exercise Physiology
Human Physiology
Muscle Metabolism

Background:

Exercise transiently increases plasma potassium ([K+]) concentrations.
Muscle contraction leads to K+ efflux, impacting extracellular K+ levels.

Purpose of the Study:

To investigate the dynamics of plasma [K+] during exercise.
To explore the role of the adrenergic system in regulating exercise-induced hyperkalemia.

Main Methods:

Measurements of venous and arterial plasma [K+] at varying exercise intensities.
Assessment of K+ balance in exercising muscles.
Pharmacological blockade of adrenergic receptors (beta and alpha).

Main Results:

Plasma [K+] rises with exercise intensity, stabilizing at submaximal levels and continuing to increase towards exhaustion at higher intensities.
Exercising muscles lose K+ during the initial phase of exercise, with minimal loss during steady-state.
Beta-adrenergic blockade impairs K+ redistribution, accentuating hyperkalemia, while alpha-adrenergic blockade reduces it.

Conclusions:

The adrenergic system plays a significant role in regulating whole-body K+ balance during exercise.
The exact contribution of the adrenergic system to K+ regulation within exercising muscles is not fully elucidated, possibly due to compensatory intracellular changes.

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