KINE 1P90 Lecture Notes - Lecture 6: Myocyte, Glycolysis, Protein Isoform
2 Feb 2017
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Document Summary
The muscle fibres within a single motor unit are homogeneous (similar) when compares on the basis of contractile and metabolic function. But when muscle fibres from different motor units are compared, we find differences in contractile and metabolic function. Classifying muscle fibre type: contractile (twitch) properties, slow twitch, fast twitch, metabolic properties, oxidative, oxidative/glycolytic, glycolytic. All muscles produce energy aerobically (with the use of oxygen) and anaerobically (without the use of oxygen), but one metabolic pathway will predominate for each type of muscle. Flow twitch fibres produce energy by aerobic processes. Fast twitch fibres: fast oxidative glycolytic (fog) fibres produce energy by aerobic and anaerobic processes, fast glycolytic (fb) fibres produce energy by anaerobic processes, the motor input to the muscle fibre. Slow twitch fibres are innervated by small a2 neurons: slow conduction velocity, low activation threshold = activated at low work intensities.
