The effect of tennis racket grip size on forearm muscle firing patterns.
BACKGROUND
Inappropriately sized tennis racket grip is often cited in the popular media as a risk factor for overuse injuries about the forearm and elbow. Currently, a hand measurement technique developed by Nirschl is commonly used by tennis racket manufacturing companies as the method for determining a player's "recommended" grip size.


OBJECTIVE
Quarter-inch changes from that recommended by Nirschl in tennis racket grip size will have no significant effect on forearm muscle firing patterns.


METHODS
Controlled laboratory study.


METHODS
Sixteen asymptomatic Division I and II collegiate tennis players performed single-handed backhand ground strokes with rackets of 3 different grip sizes (recommended measurement, undersized (1/4) in, and oversized (1/4) in). Fine-wire electromyography was used to measure muscle activity in extensor carpi radialis longus and brevis, extensor digitorum communis, flexor carpi radialis, and pronator teres. Repeated-measure analysis of variance was used for within-group comparisons, comparing different grips in specified phases for backhand ground strokes (P <or= .05).


RESULTS
There were no significant differences in muscle activity between small, recommended, or big grips in any muscle tested.


CONCLUSIONS
Based on these findings, tennis racket grip size (1/4) in above or below Nirschl's recommended measurement does not significantly affect forearm muscle firing patterns.


CONCLUSIONS
Alterations in tennis racket grip size within (1/4) in of Nirschl's recommended sizing do not have a significant effect on forearm muscle activity and therefore may not represent a significant risk factor for upper extremity cumulative trauma, such as lateral epicondylitis.
Hatch
George F
GF
Department of Orthopaedic Surgery, University of Southern California, Keck School of Medicine, Los Angeles, California 90033, USA. lhatch_2000@yahoo.com
Pink
Marilyn M
MM
Mohr
Karen J
KJ
Sethi
Paul M
PM
Jobe
Frank W
FW
D000328:Adult; D004576:Electromyography; D004867:Equipment Design; D005260:Female; D005542:Forearm / Q000502:physiology*; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D013715:Tennis / Q000502:physiology*; D013716:Tennis Elbow / Q000503:physiopathology