Effect of manipulating work rate by changing gear ratio and cadence on mechanical effectiveness and pedal forces at each crank angle during cycling

(Einfluss der Manipulation der Belastungsrate durch Veränderung der Übersetzung und der Trittfrequenz auf die mechanische Wirksamkeit und die Pedalkräfte bei jedem Kurbelwinkel während des Fahrens)

[Aim] The index of pedal force effectiveness (IFE: ratio of the tangential to the total force) increases with a higher gear ratio at a given cadence because the extent of increase is greater in the effective force (EF: tangential force applied to pedals) than that in the ineffective force (IF: radial force along a crank). Meanwhile, changes in these forces are unclear when changing the cadence at a constant gear ratio. The purpose of this study was to investigate the IFE, EF, and IF at each crank angle during cycling when manipulating the work rate with changing pedaling cadence or gear ratio. [Method] Nine male collegiate cyclists performed an incremental cycling test under two conditions. In condition A, the work rate increased by increasing the gear ratio with a constant cadence, whereas in condition B, it increased by increasing the cadence with a constant gear ratio. The work rate increased by 50W every 4 minutes (100 to 300W). The pedal force was measured every 30 degrees during the full revolution. [Results] In condition A, IFE gradually increased with the increase in the work rate, whereas it did not change in condition B. EF increased in various crank angles with the increase in work rate for both conditions; significant increase in IF in the early half of the upstroke phase was observed only in condition B. [Conclusion] IFE does not changed when the work rate increases by changing the cadence at a constant gear ratio because IF increases during the early half of the upstroke phase.
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Schlagworte: Radsport Sportgerät Regulation Belastung Biomechanik Kraft Leistung Frequenz
Notationen: Ausdauersportarten Kraft-Schnellkraft-Sportarten Sportstätten und Sportgeräte
Tagging: Trittfrequenz Pedalkraft
Veröffentlicht in: The Journal of Physical Fitness and Sports Medicine
Veröffentlicht: 2017
Jahrgang: 6
Heft: 6
Seiten: 520
Dokumentenarten: Artikel
Sprache: Englisch
Level: hoch