Kinesiology 2236A/B Lecture Notes - Lecture 4: Biceps, Bruise, Elastin

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2236A/B
• Professor: Dave Humphreys

Document Summary

Used to be called acute or chronic. This is confusing because all injuries are technically acute because something initiates them. At some point if injuries don"t heal they are considered chronic. Acute injuries are not being classified as traumatic injuries. Extrinsic/ external factors: originating outside the anatomical limits of a part. Intrinsic/ internal factors: belong toe or lying within a given part. Contractile tissue with a primary function to generate power. Isometric contraction: muscle contraction in which the length of the muscle stays constant creates moderate force. Concentric contraction: muscle shortens while contracting against resistance reduces force but increases speed. Eccentric contraction: muscle lengthens while contracting against resistance: maximal force increased force with increased speed, greatest risk of injury (cid:1) (cid:1) (cid:1) (cid:1) 1. distension (strains/ pulled muscle: direct trauma (contusion/ laceration) More common in 2 joint muscles (muscles that cross two joints such as the biceps brachii)