Estimation of Human Power Output from Maximal Vertical Jump and Body Mass.

摘要

The Lewis formula and nomogram, published in widely distributed textbooks, are used to calculate power output from vertical jump-and-reach distance and body weight. Despite the fact that the method has never been supported by refereed journal publication and the texts never revealed whether peak or average power was being estimated, the test has become increasingly used by physical educators, coaches and researchers. Theoretical analysis has raised questions about the the formula's validity. In order to evaluate the test, Lewis formula derived power output was compared to peak power and average power generated by 17 male subjects jumping vertically from a computer-interfaced force plate. Use of the Lewis formula should be discontinued because it does not provide accurate estimates of either peak or average power produced by the muscles. While the force-platform technique remains the method of choice for precise jumping-power determinations in the laboratory, the above equations can be used in conjunction with other tests to screen applicants for athletic teams and physically demanding jobs, and to monitor progress among participants in physical training and programs. Keywords: Lewis formula; Force platform; Tests. (kt)