Functional Effects of Inertial Training of the Upper Extremity

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Todd A. McLoda
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Kate M. Murphy
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Steve Davison
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Context:

Inertial training of the shoulder.

Objective:

To determine the differences of functional and EMG measures between a control group and an exercise group of overhead throwers.

Design:

Repeated measures.

Setting:

Research laboratory.

Participants:

17 intercollegiate baseball players and 19 intercollegiate softball players divided into 2 equal-size groups, control and exercise.

Main Outcome Measures:

Preliminary data were recorded, including throwing velocity, throwing accuracy, and EMG activity of the biceps brachii, upper pectorals, and posterior deltoid. The exercise group completed a 4-week training regimen on the Impulse Inertial Trainer. All participants returned for follow-up measures.

Results:

No significant group-by-time interaction occurred relative to ball velocity, accuracy, or EMG activity.

Conclusion:

For experienced throwers, functional measures and muscle activity during throwing were not affected by inertial training of the upper extremity.

McLoda and Murphy are with the School of Kinesiology and Recreation, Illinois State University, Normal, IL 61790. Davison is with Engineering Marketing Associates (EMA), Newnan, GA 30263.

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