Augmented Feedback Reduces Ground Reaction Forces in the Landing Phase of the Volleyball Spike Jump

in Journal of Sport Rehabilitation
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Context:

Frequency and magnitude of ground reaction forces (GRF) have been implicated in causing injuries such as “jumpers knee.”

Objective:

To investigate whether a single session of augmented feedback concerning landing technique would decrease GRF.

Design:

Pretest posttest experimental design.

Setting:

University biomechanics laboratory.

Participants:

Fifteen female Division 1 intercollegiate volleyball players.

Intervention:

Participants were required to land on a force platform after spiking a volleyball from a four-step approach before and after an intervention involving visual and aural augmented feedback on correct jumping and landing technique.

Main Outcome Measures:

Mediolateral (ML), anterioposterior (AP), and vertical (V) GRF normalized to body weight (BW).

Results:

Augmented feedback was found to significantly (P = 0.01) decrease VGRF by 23.6% but not ML (25%, P = 0.16) and AP (4.9%, P = 0.40) peak GRF.

Conclusions:

A single session of augmented feedback may be effective in reducing VGRF in collegiate athletes.

John B. Cronin is with Auckland University of Technology, School of Sport and Recreation in Auckland, New Zealand. He also holds an adjunct position at the School of Exercise, Biomedical, and Health Sciences at Edith Cowan University in Perth Western Australia. Eadric Bressel and Loren Finn are with the Department of Physical Education at Utah State University in Logan.