Purpose: We investigated the effect of vibration at various frequencies on serratus anterior (SA) muscle activity.

Subjects: Ten male subjects were recruited.

Methods: The subjects performed the push-up plus exercise supported by straps above the surface and vertical ropes in the Redcord sling. During the push-up plus, vibrations of 0, 30, 50, or 90 Hz were applied to the Redcord sling using a mechanical vibration apparatus attached to the rope. SA muscle activity was recorded using electromyography.

Results: SA muscle activity at the 50 Hz vibration frequency was significantly higher than that of no vibration.

Conclusion: Performing the push-up plus using a Redcord sling with mechanical vibration of 50 Hz effectively increased SA muscle activity

Key words: Mechanical vibration; Push-up plus; Serratus anterior