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THE EFFECTS OF AEROBIC FATIGUE ON JOINT KINEMATICS AND TORQUE PRODUCTION IN CYCLISTS

Abstract

M. Dixon, R. Wong, K. Csicsery, A. Popich, D. Klassen, V. Mehndiratta, & B. Higginson

Gonzaga University, Spokane, WA

PURPOSE: The purpose of the current study is to examine the effects of fatigue on joint kinematics, torque production, and mechanical efficiency of trained cyclists. Previous studies have shown that optimal efficiency decreases as cyclists fatigue during an exercise bout. A cyclist’s ability to maintain optimal efficiency and sport mechanics is critical in training, performance, and injury prevention. METHODS: Six male, trained cyclists were recruited from the Gonzaga University Cycling Club (age: 21.0 ± 0.9 years, height: 185.7 ± 5.6 cm, weight: 80.0 ± 6.2 kg). A maximum aerobic power cycling ramp test was performed on the first visit to determine peak aerobic power (PAP). On the second visit, subjects performed a 30-minute cycling bout at 70% of their peak aerobic power to induce fatigue. Kinematic markers were placed on the knee, ankle, and pedal to obtain corresponding angles. Left and right average torque angles and spin scan numbers were measured throughout the experiment. RESULTS: Pedal angles were found to be different between minutes 15 and 30, and 27 and 30 (p

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