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Lecture

Muscular Strength.docx

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School
Langara College
Department
Kinesiology
Course
KINS 2295
Professor
N.Walsh
Semester
Winter

Description
MUSCULAR STRENGTH What is muscular strength? Muscular strength- the greatest amount of force that muscles can produce in a single maximal effort What is power? Power-work per unit time- force X velocity Power involves strength and speed Types of muscular contraction 1.Dynamic Isotonic contraction- tension remains unchanged and the muscle lengths changes which causes a movement of a body part Concentric contraction- the muscle shortens with varying tension as it lifts a constant load. Eccentric contraction- the external resistance exceeds the muscle force and the muscle lengthens while developing force 2. Isometric contraction- static contraction. Tension is developed but there is no change in the angle of joint or the length of muscle 3. Isokinetic contraction- muscle is shortened at a constant velocity strength testing techniques 1. One repetition maximum- maximum amount of weight lifted once. Use free weights or machines that allow dynamic muscle contraction Nautilus machines- leverage characteristics change as the joint goes through a range of motion so that the muscle is stressed more at more optimal joint angles 2. Dynamometer techniques- consists of a spring of some type which is deformed a certain amount when a specific force is applied ex: hand grip dynamometer (measures isometric strength, inexpensive, reliable) 3. Computer assisted, isokinetic methods such as biodex -even isokinetic machines can test strength in isometric, concentric, eccentric modes -microcomputer which can program at any initial and final force, angle, velocity etc -can do manipulations -accurate and reliable but expensive strength testing considerations 1.) Standardized instructions should be given prior to testing 2.) If warmup is given, should be of uniform duration and intensity 3.) Ensure that the angle of measurement on the limb or test device is consistent among subjects 4.) Consider individual differences in body size and proportion 5.) Testing and training mode specificity are important 6.) Safety is important. Ensure that all equipment is in proper working order and that standard weight room procedures are followed
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