Graduate Thesis Or Dissertation
 

The physiological effect of posture on cycling

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r207ts93r

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  • The objective of this research was to investigate the physiological effects of body posture on cycling. The familiar positions of bicycle riding have been the touring posture (hands stretched on top handlebar) and the racing posture (hands bent at the elbow, with the back horizontal). However, a relatively new stance has been gaining in popularity since the mid-1970s. This is the semi-recumbent posture, in which the rider is seated on an office-like chair, adopting body angles similar to that of an automobile driver, with the pedals located in front of the cyclist. This study tested the above-mentioned positions, with the addition of a fully supine recumbent posture, at a moderate commuting workload (90 watts), pedaled at 60 revolutions per minute frequency. Among male volunteers, 8 healthy subjects performed a sequence of 4 posture trials on a mechanical ergometer, each lasting for 8 minutes with intermittent rest period averaging 27 minutes. Several physiological responses were measured during rest and steady-state conditions, the most prominent of which were the oxygen (caloric) consumption and heart rate. The results of the analysis of variance, using Latin Square design, showed that the heart rate during steady-state in the racing posture was significantly (α = .05) higher than that in the semi-recumbent posture. The oxygen uptake for the racing posture also expressed a higher average, but the difference was not statistically significant. The behavior of oxygen expenditure and heart rate in the other two postures resembled that of the semi-recumbent posture. Air ventilation exhibited the least volume per minute in the semi-recumbent posture and shared with the touring position in statistically different results (α = .05) from the racing posture.
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