Kinesiology 2241A/B Study Guide - Midterm Guide: Muscle Contraction, Gravity Falls

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2241A/B
• Professor: Daniel Bechard

Document Summary

Ex: in a dumbbell curl, the elbow flexors serve as the motive force on the upwards rotation. Humans are predominantly composed of third class levers, making them have a mechanical disadvantage - ex: in a dumbbell curl, bicep is motive force, elbow is fulcrum, weight is resistive force. When the line of gravity falls right through the axis of rotation, there is no forcarm. Thus, a forcar and resistive force are both present. Resistive forcar: the distance from the axis of rotation to the action line of gravity. Motive forcar: the distance from the axis of rotation to the action line of the muscle pulling on the bone. When looking at a movement (ex: bicep curl) the resistive forcar changes. As the angle of pull increases, the resistive forcar gets larger then smaller. From low medium curl, the centre of gravity moves further away from the elbow, resistive forcar increases.