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Physiologic considerations of therapeutic slideboard rehabilitation with an external loading device.

CONTEXT
Slideboard exercise is consistent with the American College of Sports Medicine guidelines for exercise intensity of 55% to 90% of maximal heart rate or 40% to 85% of maximal oxygen uptake.


OBJECTIVE
To determine if slideboard exercise while in a leg harness increases the metabolic and cardiorespiratory demands.


DESIGN
Repeated-measures design.


SETTING
Athletic Training Research Laboratory.


PATIENTS OR OTHER PARTICIPANTS
Sixteen volunteers from the university community.


INTERVENTION(S)
Subjects performed 2 graded slideboard exercise tests with and without the leg harness, each 2-minute stage ranging from 46 to 90 slides per minute.


MAIN OUTCOME MEASURE(S)
We measured maximal oxygen uptake, heart rate, blood lactate, respiratory exchange ratio, ratings of perceived exertion, and total time to exhaustion during each session.


RESULTS
Significant decreases in maximal oxygen uptake and blood lactate were observed when the leg harness was used.


CONCLUSIONS
Performance was hindered when subjects wore the leg harness during the slideboard exercise.