UNDERSTANDING RATIO OF FORCES DURING EARLY ACCELERATION

Authors

Neil BezodisFollow
Steffi Colyer
Ryu Nagahara
Helen Bayne, Department of Physiology, Faculty of Health Sciences, University of Pretoria
Ian Bezodis
Jean-Benoit Morin
Munenori Murata
Pierre Samozino

Category

Olympic

Document Type

Paper

Abstract

Ratio of forces (RF) were investigated during early acceleration by analysing block and standing starts in trained sprinters. RF variables over the initial block exit/push-off and the first four steps were determined from force plate data, and a simple macroscopic model was also applied to obtain RF variables from the velocity time-history over the entire acceleration phase. Large positive correlations existed between mean early acceleration RF and early acceleration performance from both standing (r = 0.82) and block (r = 0.89) starts, and both theoretical maximal RF and the rate of decline in RF combined to be important predictors (adj. R² = 92-97%) of performance. From the simple macroscopic model, maximum RF was nearly perfectly correlated with early acceleration performance (r = 0.96) and thus appears to be an excellent simple measure for early acceleration.

Recommended Citation

Bezodis, Neil; Colyer, Steffi; Nagahara, Ryu; Bayne, Helen; Bezodis, Ian; Morin, Jean-Benoit; Murata, Munenori; and Samozino, Pierre (2019) "UNDERSTANDING RATIO OF FORCES DURING EARLY ACCELERATION," ISBS Proceedings Archive: Vol. 37: Iss. 1, Article 123.
Available at: https://commons.nmu.edu/isbs/vol37/iss1/123