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- W2619958082 abstract "Riding bicycles with rigid frames on rough roads leads to fatigue and discomfort. In response to this problem, manufacturers have begun designing road bicycles with suspension systems. However, suspension systems intrinsically dissipate mechanical energy, which may impose a metabolic penalty. Suspension losses may be greatest for riding uphill in a standing position. PURPOSE: To quantify the effects of a novel front suspension system on the mechanical and metabolic power requirements during steep uphill bicycling. METHODS: 11 males (74.9kg) rode six 5-min trials at 3.35 m/s uphill (4.0°) on a large motorized treadmill in both sitting and standing positions using their preferred gear ratio/cadence. They wore a helmet and metabolic mouthpiece (1.05kg combined) and rode the same road bicycle (9.02kg) with the suspension in rigid and compliant configurations. The suspension system comprises a spring-loaded steering tube that allows for vertical travel of the handlebars. We equipped the bicycle with a crank-based power meter and video recorded the axial displacement (ΔL) of the steering tube relative to the frame headtube. From the video measurements of ΔL (m) and knowing the stiffness k (N/m), we calculated the mechanical power put into the suspension system: mechanical power (watts) = k ΔL2 2f, where, f = cadence in rev/s. We averaged V[Combining Dot Above]O2, and V[Combining Dot Above]CO2 for the last 2 min of each trial and calculated metabolic power. RESULTS: For the rigid and compliant conditions, mechanical power was the same (2.85 ±0.05 W/kg) while sitting (p = 0.71) and not different for standing: 2.86 ±0.03 W/kg vs. 2.87 ±0.05 W/kg respectively (p = 0.51). Metabolic power for sitting was 13.11 ±0.56W/kg rigid vs. 13.21 ±0.57W/kg compliant (p=0.23). For standing, metabolic power was 14.23 ±0.76W/kg and 14.15 ±0.84W/kg respectively (p=0.45). Power losses in the suspension while sitting 0.01±0.004W/kg, and standing 0.03±0.01W/kg, were < 1.05% of total mechanical power. CONCLUSION: The steering tube suspension system did not require significantly more mechanical or metabolic power compared to riding with the suspension rigidly locked out. Supported by a gift from Specialized Bicycle Components Inc." @default.
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- W2619958082 date "2017-05-01" @default.
- W2619958082 modified "2023-09-27" @default.
- W2619958082 title "Front Suspension Does Not Increase Mechanical or Metabolic Power Requirements during Uphill Bicycling" @default.
- W2619958082 doi "https://doi.org/10.1249/01.mss.0000517909.59811.25" @default.
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