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Changes in plasma zinc following high force eccentric exercise.

K Nosaka¹, P M Clarkson

¹Institute of Sports Medicine, Yokohama City University, Japan.

International Journal of Sport Nutrition

|June 1, 1992

Summary

Eccentric exercise causes muscle damage but does not increase plasma zinc levels. This study found no significant changes in total plasma zinc (Zn) after maximal eccentric or concentric exercise in female subjects.

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Area of Science:

Exercise Physiology
Nutritional Biochemistry

Background:

Muscle damage from exercise can affect various physiological markers.
Plasma zinc (Zn) is an essential mineral involved in numerous cellular processes.

Purpose of the Study:

To investigate if exercise-induced muscle damage elevates plasma zinc concentrations.
To compare the effects of eccentric versus concentric exercise on plasma zinc levels.

Main Methods:

Eight female subjects underwent maximal eccentric (ECC) and concentric (CON) forearm flexor actions.
Muscle damage indicators included maximal isometric force, joint range of motion, soreness, and plasma creatine kinase (CK).
Plasma zinc (Zn) and CK levels were measured post-exercise.

Main Results:

Eccentric exercise induced significant muscle damage, indicated by changes in force, range of motion, soreness, and elevated CK.
Concentric exercise resulted in minimal changes in these muscle damage markers.
Neither ECC nor CON exercise protocols led to significant alterations in plasma zinc (Zn) levels.

Conclusions:

Exercise-induced muscle damage does not appear to cause an increase in plasma zinc levels.
Plasma zinc homeostasis remains stable despite significant eccentric exercise-induced muscle damage.

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