Work and power outputs determined from pedalling and flywheel friction forces during brief maximal exertion on a cycle ergometer

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Bibliographic Details
Title translated into German:Bestimmung der Werte der Arbeit und Leistung waehrend kurzer maximaler Fahrradergometerbelastung aus Pedalkraft und Schwungradwiderstand
Author:Hibi, Naohiro; Fujinaga, Hiroshi; Ishii, Kihachi
Published in:European journal of applied physiology
Published:74 (1996), 5 , S. 435-442, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Language:English
ISSN:1439-6319, 0301-5548
Keywords:
Online Access:
Identification number:PU199611201454
Source:BISp

Author's abstract

Work and power outputs during short-term, maximal exertion on a friction loaded cycle ergometer are usually calculated from the friction force applied to the flywheel. The inertia of the flywheel is sometimes taken into consideration, but the effects of internal resistances and other factors have been ignored. The purpose of this study was to estimate their effects by comparing work or power output determined from the force exerted on the pedals (pedalling force) with work or power output determined from the friction force and the moment of inertia of the rotational parts. A group of 22 male college students accelerated a cycle ergometer as rapidly as possible for 3 s. The total work output determined from the pedalling force (TWp) was significantly greater than that calculated from the friction force and the moment of inertia (TWf). Power output determined from the pedalling force during each pedal stroke (SPp) was also significantly greater than that calculated from the friction force and the moment of inertia. Percentage difference (%diff), defined by %diff = ((TWp - TWf)/TWf) x 100, ranged from 16.8% to 49.3% with a mean value of 30.8(SD 9.1)%. It was observed that %diff values were higher in subjects with greater TWp or greater maximal SPp. These results would indicate that internal resistances and other factors, such as the deformation of the chain and the vibrations of the entire system, may have significant effects on the measurements of work and power outputs. The effects appear to depend on the magnitudes of pedalling force and pedal velocity. Verf.-Referat