Kinesiology 2241A/B Lecture Notes - Lecture 6: Rectus Femoris Muscle, Vastus Medialis, Brachialis Muscle
25 Mar 2018
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The muscles overlay the skeleton and provide the means to move it: each muscle produces a motion when it creates tension and tries to shorten. Its attachments and orientation determine what moves and how: different muscles have different shapes/ wrappings, and a different alignment of fibers, origin proximal attachment of a muscle. If they only cross one it is called uniarticulate or one joint: example: soleus in the calf group of muscles, only crosses the ankle, muscles that cross 2 or more joints affect several joints simultaneously when they contract. Mus(cid:272)le has a(cid:374) (cid:858)ideal le(cid:374)gth(cid:859) at whi(cid:272)h (cid:373)a(cid:454)i(cid:373)u(cid:373) te(cid:374)sio(cid:374) is produced. Tension drops off if it is longer or shorten than this length: the speed of the muscle. This is the velocity-tension curve for a muscle. As the muscle shortens faster its tension drops quickly. When a muscle is lengthening (eccentric contraction) the tension goes up!
