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Lecture

KINS 2295 Lecture Notes - Isotonic Contraction, Microcomputer, Hypertrophy

by

Department
Kinesiology
Course Code
KINS 2295
Professor
N.Walsh

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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
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