SSEH1101 Study Guide - Final Guide: Disinhibition, Agonist, Clavicle
19 Jun 2018
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SSEH1101: Revision Notes 7
Maximum Force that can be produced:
-Due to changes in involvement of motor units!
-Decrease in co-contraction of muscles that are ANTAGONISTS!
-= muscles opposing the action of prime movement!
-Disinhibition of agonist !
-= body’s protective mechanism to prevent injury!
Development of Force @ Maximum Rate:
-Component includes muscle power!
-Depends on:!
-1. Number of sarcomeres in series!
-2. Rate at which cross bridges working!
Number of Sarcomeres in Series: Examples
-Large number of them = increases rate of shortening!
-Eg. Reptilian muscle has longer myosin filaments!
-= many cross bridges AND sarcomeres!
-= BUT fewer sarcomeres in a given length of muscle!
-Strong, but development of tension is slow!
Number of Sarcomeres in Series: Red
-slow twitch fibres!
-Long sarcomeres!
-Thus it is slow!
-Used for ENDURANCE"
Number of Sarcomeres in Series: White
-fast twitch fibres!
-Short sarcomeres!
-Thus it is fast!
-Used for EXPLOSIVE SPEED AND POWER!
Rate of Cross Bridges Working:
-depends on muscle fibre type!
-Slow twitch red fibres!
-= cross bridges work @ slower rate!
-= sustained contractions !
-Fast twitch white fibres!
-= cross bridges work @ faster rate!
-= fatigue quicker!
