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Arch Phys Med Rehabil. 2008 Apr;89(4):719-25. doi: 10.1016/j.apmr.2007.09.035.

Cardiovascular and metabolic responses during functional electric stimulation cycling at different cadences.

Author information

1
Rehabilitation Research Centre, Discipline of Exercise and Sports Science, Faculty of Health Sciences, University of Sydney, Sydney, NSW, Australia. cfornuse@mail.usyd.edu.au

Abstract

OBJECTIVE:

To determine the influence of pedaling cadence on cardiorespiratory responses and muscle oxygenation during functional electric stimulation (FES) leg cycling.

DESIGN:

Repeated measures.

SETTING:

Laboratory.

PARTICIPANTS:

Nine subjects with T4 through T10 spinal cord injury (SCI) (American Spinal Injury Association grade A).

INTERVENTIONS:

FES cycling was performed at pedaling cadences of 15, 30, and 50 revolutions per minute (rpm).

MAIN OUTCOME MEASURES:

At each cadence, heart rate, oxygen uptake, and cardiac output were recorded during 35 minutes of cycling. Near infrared spectroscopy was used to quantify quadriceps muscle oxygenation.

RESULTS:

All pedaling cadences induced similar elevations in cardiorespiratory metabolism, compared with resting values. Higher average power output was produced at 30rpm (8.2+/-0.7W, P<.05) and 50rpm (7.9+/-0.5W, P<.05) compared with 15rpm (6.3+/-0.6W). Gross mechanical efficiency was significantly higher (P<.05) at 30 and 50rpm than at 15rpm. Quadriceps muscle oxygenation did not differ with pedaling cadences.

CONCLUSIONS:

Cardiorespiratory responses and muscle metabolism adjustments during FES leg cycling were independent of pedal cadence. FES cycling at a cadence of 50rpm may not confer any advantages over 30 or 15rpm for cardiovascular fitness promotion in persons with SCI.

PMID:
18374003
DOI:
10.1016/j.apmr.2007.09.035
[Indexed for MEDLINE]

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