Effect of Chain Wheel Shape on Crank Torque, Freely Chosen Pedal Rate, and Physiological Responses during Submaximal Cycling

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概要

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• The development of noncircular chain wheels for the enhancement of cycling performance has been in progress for a long time and continues apace. In this study we tested whether submaximal cycling using a non-circular (Biopace) versus a circular chain wheel resulted in lower peak crank torque at preset pedal rates as well as resulting in lower pedal rate and metabolic response at freely chosen pedal rate. Ten trained cyclists (mean±SD: 27±3 years of age, 182±4cm tall, 77.5±7.0kg of body mass, and peak oxygen uptake of 61.7±4.4mlkg^<-1> min^<-1>) cycled with a Biopace and a circular chain wheel at 180W at 65 and 90rpm for recording of crank torque profiles, and at their freely chosen pedal rate for recording of pedal rate and metabolic response, including oxygen uptake and blood lactate concentration. Crank torque profiles were similar between the two chain wheels during cycling at preset pedal rates. During cycling at the freely chosen pedal rate (being 93±6 and 93±4rpm for the Biopace and circular chain wheel, respectively), blood lactate concentration was significantly different between the two chain wheels, being on average 0.2mmol l^<-1> lower with the Biopace chain wheel. A musculoskeletal simulation model supported the idea that a contributing factor to the observed difference in blood lactate concentration may be slightly reduced muscle activity around the phase where peak crank torque occurs during cycling with the Biopace chain wheel. In that particular phase of the crank revolution, the observed slightly lower muscle activity may result from larger transfer of energy from the legs to the crank.

著者

• Rasmussen John

  Institute Of Mechanical Engineering Aalborg University

• Hansen Ernst

  Department of Physical Performance, The Norwegian School of Sport Sciences

• Jensen Kurt

  Team Danmarks Testcenter, University of Southern Denmark

• Hallen Jostein

  Department of Physical Performance, The Norwegian School of Sport Sciences

• Pedersen Preben

  Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark

• Pedersen Preben

  Institute Of Sports Science And Clinical Biomechanics University Of Southern Denmark

• Jensen Kurt

  Team Danmarks Testcenter University Of Southern Denmark

• Hansen Ernst

  Department Of Physical Performance The Norwegian School Of Sport Sciences

• Hallen Jostein

  Department Of Physical Performance The Norwegian School Of Sport Sciences

関連論文

• Effect of Chain Wheel Shape on Crank Torque, Freely Chosen Pedal Rate, and Physiological Responses during Submaximal Cycling
• Anatomy and Biomechanics of the Back Muscles in the Lumbar Spine With Reference to Biomechanical Modeling

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