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  • Title: Cardiovascular and metabolic responses during functional electric stimulation cycling at different cadences.
    Author: Fornusek C, Davis GM.
    Journal: Arch Phys Med Rehabil; 2008 Apr; 89(4):719-25. PubMed ID: 18374003.
    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.
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