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Fatigue effects on the coordinative pattern during cycling: kinetics and kinematics evaluation
Rodrigo Rico Bini1, Fernando Diefenthaeler, Carlos Bolli Mota
1Universidade Federal do Rio Grande do Sul, Escola de Educação Física, Laboratório Pesquisa do Exercício, sala 212, Porto Alegre, RS, Brazil. rbini@via-rs.net
Summary
Cycling fatigue alters lower limb mechanics. Joint moments and forces increase, while ankle contribution decreases, indicating a shift in muscle function and compensatory kinematic strategies during exhaustion.
Area of Science:
- Biomechanics
- Exercise Physiology
- Sports Science
Background:
- Cycling performance relies on efficient lower limb biomechanics.
- Understanding how fatigue affects joint kinetics and kinematics is crucial for optimizing training and preventing injury.
Purpose of the Study:
- To analyze net joint moment distribution, joint forces, and kinematics during a cycling-to-exhaustion test.
- To investigate the contribution of hip, knee, and ankle joints to overall lower limb mechanics under fatigue.
Main Methods:
- Ten cyclists performed a fatigue cycling test at 100% of maximal power output (PO(MAX)).
- Inverse dynamics were used to calculate net joint moments, resultant forces, and kinematics for the hip, knee, and ankle.
- Pedal forces and lower limb kinematics were measured.
Main Results:
- Pedaling cadence and ankle moment contribution decreased with fatigue.
- Total absolute joint moments, as well as hip and knee moments, increased.
- Resultant forces increased, and kinematics of the hip, knee, and ankle joints changed.
Conclusions:
- Reduced ankle contribution, increased ankle force, and altered kinematics suggest a modified mechanical role for the ankle joint during fatigue.
- Changes in hip and knee kinetics and kinematics are likely compensatory responses to decreased muscle contractile properties during exhaustion.
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