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Magnitude and variation of lower limb joint moments and muscle excitations are symmetric during hopping
Feldman, William J. Jessup, Luke N. Daley, Monica A. Silverman, Anne K.
Feldman, William J.
Jessup, Luke N.
Daley, Monica A.
Silverman, Anne K.
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2025-04
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Abstract
Asymmetric muscle strength can influence dynamic movement in a variety of tasks and across the lifespan. While asymmetric muscle strength can occur from continuous and repeated use, most studies focus on single rep, maximal effort tasks, often with high-performing athletes. Comparing tasks of varying difficulty may help characterize muscular and movement asymmetry. Net joint moments are useful to determine mechanical requirements of dynamic tasks and are largely a result of muscle strength. Therefore, this study aimed to compare lower limb joint moments between legs for single-leg and double-leg hopping tasks in young, healthy individuals. Nine participants (4M/5F, 22.1yrs ± 3.2yrs, 1.73m ± 0.09m, 66.98kg ± 11.94kg) completed a baseline double-leg hopping task and bilateral single-leg hopping tasks. Kinetic (2000hz) and full-body kinematic (200hz) data were collected at self-selected frequency, averaging 11.11 and 8.11 cycles over 15 seconds for double-leg and single-leg tasks, respectively. Each cycle was defined from ground contact to subsequent ground contact. A 12-segment dynamic model was used to compute sagittal-plane joint moments at the hip, knee and ankle. A paired t-test revealed a significant difference between legs in bilateral peak hip joint moment during double-leg hopping (p=0.015), but there were no differences between legs at the knee or ankle, or during single-leg hopping. F-tests found no difference in peak moment variance between legs for any joint for either task. These findings indicate symmetric joint moment variation and magnitude for tasks of differing mechanical demands in young, healthy participants. Future work will evaluate a broader population.
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