An ergonomic analysis of commercially available exercise equipment : implications for resistance training and clinical rehabilitation

摘要

This study examined the often contrived advertising claimsof the manufacturers of variable resistance isotonic machinery.Specifically, the study sought to ascertain whether certainequipment was compatible with musculo-skeletal and perceptual needs and limitations of the human user: that is, to determine whether presently installed eccentric cams, which provide the variable resistance, matched the users force curves.The format of this research was in the ergonomic traditionin which empirical research is not necessarily the primaryavenue. Consequently the inter-disciplinary nature ofergonomics required small-scale laboratory- simulationexperiments to be conducted in a diverse range of disciplines such as physiology, psychology and biomechanics.It was found that on all five pieces of variable resistance machinery analysed, a mismatch between the force curves and the eccentric cams exist. The cams were redesigned accordingly. The metabolic cost of performing fixed-rateisoinertial lifts was moderate. The psychophysical analysisrevealed that perceptual responses indicated that the work was classified as 'light' and only at 30% stress levels do local cues begin to dominate .Based on these findings it was concluded that manufacturers advertising claims in the instances analyzed were not well-founded and that variable resistance isotonic machinery should only be used to develop muscular strength and endurance, and do not effectively serve as weight-loss devices.iii