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  • Title: Joint Torques and Patellofemoral Force During Single-Leg Assisted and Unassisted Cycling.
    Author: Bini RR, Jacques TC, Vaz MA.
    Journal: J Sport Rehabil; 2016 Feb; 25(1):40-7. PubMed ID: 25474095.
    Abstract:
    CONTEXT: Unassisted single-leg cycling should be replaced by assisted single-leg cycling, given that this last approach has potential to mimic joint kinetics and kinematics from double-leg cycling. However, there is need to test if assisting devices during pedaling effectively replicate joint forces and torque from double-leg cycling. OBJECTIVES: To compare double-leg, single-leg assisted, and unassisted cycling in terms of lower-limb kinetics and kinematics. DESIGN: Cross-sectional crossover. SETTING: Laboratory. PARTICIPANTS: 14 healthy nonathletes. INTERVENTIONS: Two double-leg cycling trials (240 ± 23 W) and 2 single-leg trials (120 ± 11 W) at 90 rpm were performed for 2 min using a bicycle attached to a cycle trainer. Measurements of pedal force and joint kinematics of participants' right lower limb were performed during double- and single-leg trials. For the single-leg assisted trial, a custom-made adaptor was used to attach 10 kg of weight to the contralateral crank. MAIN OUTCOME MEASURES: Peak hip, knee, and ankle torques (flexors and extensors) along with knee-flexion angle and peak patellofemoral compressive force. RESULTS: Reduced peak hip-extensor torque (10%) and increased peak knee-flexor torque (157%) were observed at the single-leg assisted cycling compared with the double-leg cycling. No differences were found for peak patellofemoral compressive force or knee-flexion angle comparing double-leg with single-leg assisted cycling. However, single-leg unassisted cycling resulted in larger peak patellofemoral compressive force (28%) and lower knee-flexion angle (3%) than double-leg cycling. CONCLUSIONS: These results suggest that although single-leg assisted cycling differs for joint torques, it replicates knee loads from double-leg cycling.
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