Results: As workload increased, BF and TA displayed earlier activations and delayed deactivations in each cycle thatresulted in a significantly (p < 0.05) longer duration of activity at higher workloads. RF showed a significantly longerduration of activity between 0 and 50 W as well as 0 and 100 W (p < 0.05); however, the activity duration of GTwas not appeared to be affected significantly by workload. EMG peak-magnitude of RF, BF, and TA changedsignificantly (p < 0.05) as workload increased, but no changes were observed in the EMG peak-timing acrossworkloads. Durations of co-activation in the RF-BF pair as well as the RF-TA pair increased significantly withworkload, while the RF-TA and TA-GT pairs were only significantly different (p < 0.05) between the 0 and 100 Wworkload levels. Increased workload did not lead to any significant changes in the joint kinematics.