2024
DOI: 10.1242/jeb.246879
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Linking in vivo muscle dynamics to force–length and force–velocity properties reveals that guinea fowl lateral gastrocnemius operates at shorter than optimal lengths

M. Janneke Schwaner,
Dean L. Mayfield,
Emanuel Azizi
et al.

Abstract: The isometric force-length (F-L) and isotonic force-velocity (F-V) relationships characterize the contractile properties of skeletal muscle under controlled conditions, yet it remains unclear how these properties relate to in vivo muscle function. Here, we map the in situ F-L and F-V characteristics of guinea fowl (Numida meleagris) lateral gastrocnemius (LG) to the in vivo operating range during walking and running. We test the hypothesis that muscle fascicles operate on the F-L plateau, near the optimal leng… Show more

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