Slide 1Slide 2Psychophysical StrengthSlide 4Comparison of Strength TestsPersonal Factors Affecting StrengthSlide 7Slide 8IE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #7IE 5532IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #7IE 5533Psychophysical Strength•Developed by Snook (1978), Liberty Mutual•Maximum acceptable weight (MAW) through psychophysical estimation•Tables of MAW as population %:–Gender (M, F)–Tasks•Lift/lower: Knuckle/shoulder/arm height, box size•Push/pull: initial/sustained, height•Carry: distance, height–Frequency (lift per 5,9,14 sec; 1,2,5,30 min; 8 hr)IE 5534MAW of lift for males (kg)Excel FilesIE 5535Comparison of Strength Testsμ(kg) CV% μ(kg) CV%Static 47.4 8.2 M 42.4 5.1Dynamic 41.9 9.2 F 30.0 10.2Psycho 19.4 5.7Static vs. Dynamic r = 0.47Static vs. Psycho r = 0.35Dynamic vs. Psycho r = 0.14IE 5536Personal Factors Affecting Strength•Gender: F = M⅔•Age: 20-30%↓•Anthropometry–Str vs. W: r = 0.3-0.5–Combo: r = 0.6•Intercorrelations–Compatible r = 0.6•Training–↑ 30-40% over 6 mon.–↑ glycogen, A&MIE 5537IE
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