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Annual Meeting Abstracts: F-23 – Free Communication/Poster: Energy Expenditure Measurement

Effect of Varying Stride Length on Cardiorespiratory Response during Elliptical Trainer Exercise

Dolny, Dennis; Hughes, Nikki J.; Caylor, Ricky; Browder, Kathy

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Medicine & Science in Sports & Exercise: May 2004 - Volume 36 - Issue 5 - p S250
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Elliptical trainer exercise typically utilizes cadence and resistance to enhance energy expenditure. To date no research has examined the effect of altering stride length on energy expenditure. PURPOSE: To determine the effect of varying stride length (SL) in combination with resistance levels (RL) on oxygen consumption (V02, ml/kg/min), respiratory exchange ratio (RER), heart rate (HR, bpm) and ratings of perceived exertion (RPE) during elliptical trainer exercise. METHODS: Fourteen trained college males (age: 23 ± 4.7 yrs; Ht: 177 ± 7.0 cm; Wt: 80.2 ± 12.9 kg; Body fat: 14.3 ± 4.7 %) volunteered to participate in a completely randomized split-plot design. Each subject exercised on a SportsArt Model 8300 elliptical trainer on three different days representing 3 RL (RL1, RL2 & RL3) and 4 SL (SL45, SL53, SL59, & SL65 cm). Each subject maintained a cadence of 55–60 rpm and exercised for six min during each trial. Expired air and HR were measured during min 4–6. RPE was recorded at the end of each trial. Subjects were allowed 3 min rest between trials. RESULTS: HR, VO2, and RPE increased (p<0.001) from RL1 to RL2 and RL3 and RER increased (p<0.004) from RL1 to RL3 irrespective of SL. HR was greater (p<0.01) during SL65 vs SL45 (142 ± 13 vs 134 ± 13 bpm). VO2 (ml/kg/min) was greater (p<0.01) during SL65 vs SL53 and SL45 (26.2 ± 3.8 vs 24.2 ± 3.8 and 23.4 ± 3.8 ml/kg/min), and greater (p<0.01) during SL59 vs SL45 (25.2 ± 3.5 vs 23.4 ± 3.8 ml/kg/min). RPE and RER were not significantly affected by SL. CONCLUSION: These results suggest that increasing SL is an effective method to enhance the cardiorespiratory demand during elliptical trainer exercise. The greater excursion of the lower extremity likely contributed to the increased energy expenditure.

©2004The American College of Sports Medicine