Lecture 3 - Controlling Force Production Lecture Notes PDF

Controlling Force Production Physiologically, what is movement? What makes all of these activities the same? Neural Drive Muscle Contraction Energy Utilization  Substrate Supply & Clearance Delivery Clearance – O2 – CO2 –...

Controlling Force Production Physiologically, what is movement? What makes all of these activities the same? Neural Drive Muscle Contraction Energy Utilization  Substrate Supply & Clearance Delivery Clearance – O2 – CO2 – CHO – H2O – Lipid – HCO3- – Hormones What makes all of these activates different? Intensity When are fibres active? Energy System Contribution 100 90 80 % of Energy System Capacity 70 60 50 Phosphagan Glycolitic 40 Oxidative 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 % of Maximal Force Capacity Metabolic Contribution  Time Based on Intensity, how long can you sustain the muscular action? Controlling Motion – Motor Unit Properties Size Principle Muscular Variables Associated with Force Muscle Cross Sectional Area Muscle morphology (fiber type distribution) Muscle architecture (pennation angle/fascicle length) Tendon structure (Stiffness)  Neural Variables Associated with Force Motor Unit Recruitment Rate Coding Motor Unit Synchronization Central Activation Drive/Ratio Intramuscular coordination Intermuscular coordination Increased excitation with decreased inhibition Resistance Training – What are we trying to accomplish? How? Metabolic Training – What are we trying to accomplish? How? Weight Loss – What are we trying to accomplish? How? Exercise in Elderly – What are we trying to accomplish? How?  Does getting old mean becoming deteriorated? Aging process or result of sedentary lifestyles?