KINE 4010 Study Guide - Final Guide: Hyperaemia, Skeletal Muscle, Protein Isoform

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 4010
• Professor: David Hood

Document Summary

Process that produces contraction is initiated by electrical changes travelling across the membrane: depolarization of the sarcolemma itself is caused y electrochemical events at the neuromuscular junction. Electromyogram: measures electrical signal; summation of electrical activity of all active motor units: similar to electrocardiogram, which measures activity of the heart. Emg is influenced by anatomical and physiological properties of muscle, instrumentation used, resistance of skin and subcutaneous fat: comparisons between people can be made if values are expressed as percentage of their maximal voluntary contraction (mvc) Amount of electrical activity determines the force with which the muscle contracts activation/firing: related to number of motor units activated and frequency of. Without taking fatigue into account, greater electrical activity leads to higher force produced. Power output (kgm/min) = resistance (kg) x distance (m/rev) x pedalling frequency (rev/min) Exercise is characterized by a sharp increase in metabolic activity. Oxygen uptake increases in proportion to intensity of exercise and of muscle mass used.