Slide 1Slide 2Types of Motor UnitsMotor Unit ContractionTypes of ContractionMotor Unit Recruitment Size principle = Orderly, small to largeTrainingEnergy MetabolismSlide 9Work-Rest CyclingSlide 11Other Fatigue EffectsSlide 13IE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #3IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #3IE 5533Types of Motor UnitsIE 5534Motor Unit ContractionIE 5535Types of Contraction•Isometric = constant length (static)•Isotonic = constant force (dynamic)–Concentric = muscle shortens–Eccentric = muscle lengthens–Isokinetic = constant velocity–Isoinertial = constant accelerationIE 5536Motor Unit RecruitmentSize principle = Orderly, small to largeIE 5537TrainingIE 5538Energy MetabolismATP = adenosine triphosphate, CP = creatine phophateAerobically (with O2) = glucose + 6O2 → 6H2O + 6CO2 +38ATPAnaerobically (no O2) = glucose → 2 lactate + 2ATPIE 5539Fatigue and Endurance TimesT(sec) = 1236.5 – 72.5 (%max–15)0.618IE 55310Work-Rest CyclingIE 55311Work-Rest CyclingIE 55312Other Fatigue EffectsIE
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