Kinesiology 2236A/B Lecture Notes - Lecture 4: Bruise, Neovascularization, Intramuscular Injection
12 Feb 2019
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What factors cause injuries: extrinsic/external- originating outside the anatomical limits of a part, can both lead to injury. Intrinsic/internal- belonging to or lying within a given part. Muscle characteristics: contractile tissue with central function to generate power, well vascularized . so, good o2 & nutrients, good for healing, bruising occurs when the muscle is injured. Isometric- muscle contraction in which length of muscle stays the same: moderate force, concentric- muscle shortens while contracting against resistance e, reduced force with increased velocity, eccentric muscle lengthens while contracting against resistance, maximal force. Increased fore with increased velocity: greater risk of injury, on the exam. In 2 ways: distention type injury, strains/muscle pulled, direct trauma, contusion and laceration. Oxford scale for grading muscle strength: memorize this. Grade 1 strain: usually less than 10% - 20%of fibers torn or stretched, near full rom with some discomfort near the end, good strength 4-5/5, slight pain/discomfort. Significantly rom with some discomfort near the end.
