Slide 1Slide 2Slide 3Physiological Changes During WorkHR vs. WorkloadHR and FatigueHR vs. Age and GenderSlide 8Cardiovascular DiseasesCoronary Heart DiseaseIE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #23IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #23IE 5533Control ChartIE 5534Physiological Changes During Work1) (quick)↑ sympathetic & ↓ parasympathetic2) (later) local auto-regulation ( > #1)3) Massive redistribution of blood flow4) Generation of heat5) Secondary vasodilation6) Fluid accumulation in active muscleRest WorkBlood flow (l/m) 5 25% distribution Brain 15 4 Heart 5 5 Kidney 20 3 Organ 30 5 Muscles 30 83MAP (mm Hg) 93 130HR (b/min) 70 200SV (ml) 80 160TPR - ↓66%IE 5535HR vs. Workload•HR correlated with work stress:–Physical workload–Mental workload–Heat stress–Fatigue•Static work vs. dynamic work–Pressor response–Pooling of blood, faintingIE 5536HR and Fatigue•Heart rate creep•Brouha criterionIE 5537HR vs. Age and Gender•Predict max HR •HR ↓ with ageHRm= 220 – AgeHRm= 209 – 0.7 AgeHRm= 217 – 0.876 AgeHRm= 190 – 0.667(Age-25)•Female > malesIE 5538•Training: ↓ HR, ↑CO, ↑ VO2•Min program: 30 min, 3x a week HR vs. TrainingIE 5539Cardiovascular Diseases•Stenosis – narrowing of arteries•Atherosclerosis – thickening of artery walls •Arteriosclerosis – hardening of arteries•Thrombosis – blocking of blood vessels•Heart attack – death of muscle (infarction)•Stroke – occlusion of blood flow in brain•Fibrillation- random beating of cardiac muscleIE 55310Coronary Heart Disease1) Age2) Gender (male)3) Smoking4) Heredity (race)5) Diabetes6) Lack of exercise7) Obesity8) High blood pressure9)
View Full Document
Unlocking...