How Muscles REALLY Work: Sliding Filament Theory
Channel: Stuart McErlain-Naylor
Date: 2021-11-16

How do muscles work? This video explains the sliding filament theory of muscle contraction, the force-length relationship, and the force-velocity relationship.

The cross-bridge cycle is explained in detail, in relation to calcium, actin, myosin, troponin, tropomysoin, and more. The underlying theory of muscle contraction mechanics is used to explain the causes of muscle's force-length and force-velocity relationships.

Full muscle mechanics lecture: https://youtu.be/meRLirTKkhQ 
More sports biomechanics teaching videos: https://youtube.com/playlist?list=PLI7VLEjUJidBdBP2IYFPcrX_lh1RGtNUf 

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00:00 How do muscles work?
00:15 How is muscle structured?
00:31 The sarcomere
00:53 Cross-bridge cycles and the sliding filament theory
02:03 Muscle cross-bridge cycles in 3D
02:37 The force-length relationship in muscle
04:06 The force-velocity relationship in muscle
05:07 Power in muscle (force x velocity)
05:27 Muscle mechanics in detail

Source of GIFs/Videos used:
Drew Barry's 3D cross-bridge cycle video: https://www.youtube.com/watch?v=eyYTHn2JLgI 
Calcium binding GIF: https://gfycat.com/basicreasonablehydatidtapeworm-muscle-contraction-process-molecular-mechanism-3d-animation 
ADP/ATP GIF: https://makeagif.com/gif/breakdown-of-atp-and-cross-bridge-movement-during-muscle-contraction-hd-animation-fzMnZ4?origin=tag&source=animation&order=new&page=588&position=7 

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