The effects of the powercam crank system on physiological and perceptual indicators of efficiency in humans during endurance cycling

Six adult male volunteers of similar body size (x̄ ± SD:ht = 184.6 ± 6.4 cm; wt = 80.86 ± 2.7 kg) and aerobic exercise capacity (VO₂ = 38 ± 3.1 ml·kg⁻¹. min⁻¹) were tested to determine what physiological and perceptual differences existed during endurance cycling using a Powercam (Houdaille, Inc.) crank system (CAM) as compared to a standard crank system (STD). Following preliminary tests to determine the subject's working capacity, each was assigned to ride either in the CAM or STD mode for 1 hour using a gear ratio that would require an effort equal to 70% of the VO₂ max. After a minimum of 72 hours between trials, subjects were retested in the converse mode. Measurements that included HR, BP, VO₂, surface EMG, and RPE were monitored at 15 minute intervals during both tests. Responses were very similar across modes and between subjects. Although subjects demonstrated responses that may indicate an improved efficiency for a particular mode, the group did not display patterns that would indicate efficiency for the Powercam crank system.

Name thesis:degree_name

M.S.

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Education in Health and Physical Education

Department dc:contributor.department

Education in Health and Physical Education

Grantor dc:publisher

Virginia Polytechnic Institute and State University

Year dc:date.issued

1986

Author dc:creator

• Harris, Kevin W.

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/10919/94461

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/94461