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• W2467809399 abstract "Running can be described as a series of bilateral single-legged jumps and landings; however, single-legged locomotion (SLL) is anecdotally more difficult than bi-lateral locomotion (BLL). Muscle activity may play a role in this increased difficulty; it is not known how active different muscles are during SLL vs. BLL, or whether providing body weight support during SLL would elicit more similar activity levels compared with BLL. PURPOSE: To compare muscle activity during single-legged locomotion at different levels of effective body weight (BW). METHODS: Subjects (n=12; 25.00±7.74 years, 1.67±0.09 m, 63.28±11.42 kg) performed running at 100% BW in addition to single-legged hopping at 80%, 70%, 60%, 50%, and 40% BW. Muscle activity of the Rectus Femoris, Semitendinosus, Tibialis Anterior, and Medial Gastrocnemius was measured. Average muscle activity was calculated over 15 seconds (zero offset removed, full-wave rectified). Activity from each muscle was analyzed using a one-way repeated measures analysis of variance (α=0.05). RESULTS: Muscle activity of the Semitendinosus and Tibialis Anterior was not affected by varying levels of effective BW (p>0.05). Muscle activity of the Rectus Femoris and Medial Gastrocnemius was influenced by varying levels of effective BW (p<0.05). For the Rectus Femoris, hopping at 80% BW and 70% BW elicited higher average muscle activity than running (92.4%; 70.8% increase, respectively), hopping at 60% BW (24.2%; 10.2%), hopping at 50% BW (39.9%; 24.2%), and hopping at 40% BW (62.5%; 44.3%). For the Gastrocnemius, hopping at 80% BW and 70% BW elicited higher average muscle activity than running (70.3%; 50.8% increase, respectively) and hopping at 40% BW (57.2%; 39.2%). CONCLUSIONS: It appears that increased knee flexor muscle activity is the primary mechanism that is responsible for why SLL is more difficult than BLL. Muscle activity between BLL and SLL at 50% BW were shown to be similar, which suggests the occurrence of a bilateral deficit. However, it is still unclear whether these increases are the result of the existence of a bilateral deficit, or a result of a change in the movement pattern." @default.
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• W2467809399 date "2016-05-01" @default.
• W2467809399 modified "2023-10-17" @default.
• W2467809399 title "Muscle Activity of the Lower Limb During Single-Legged Hopping" @default.
• W2467809399 doi "https://doi.org/10.1249/01.mss.0000487200.27230.cb" @default.
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