DOES THE ALIGNMENT OF THE FORCE VECTOR AND THE CENTRE OF MASS TRAJECTORY AFFECT TUMBLE TURN PERFORMANCE?

Authors

Paul Koster, InnoSportLab de Tongelreep, Eindhoven, NetherlandsFollow
Sander Schreven, InnoSportLab de Tongelreep, Eindhoven, NetherlandsFollow
Peter J. Beek, Vrije Universiteit AmsterdamFollow
Sina David, Vrije Universiteit Amsterdam, Department of Human Movement SciencesFollow

Category

Water Sports

Document Type

Paper

Abstract

We examined the hypothesis that the exit velocity (V_out) during the freestyle tumble turn depends on the alignment of the force vector with the body centre of mass trajectory. Seven swimmers performed a total of 21 turns while video and force data were gathered. We calculated the angle from the centre of pressure to the body centre of mass (COM) and determined its difference with the angle of the push-off force vector during wall contact. This difference was then correlated with V_out, yielding a non-significant result (-4.89 ± 2.48° with r = -0.11 (p = 0.63), thus refuting the hypothesis. However, there was a strong correlation between V_out and the impulse of the projection of the force vector on the COM vector (258 ± 75 N*s with r = 0.76 (p < 0.001)), which requires further scrutiny.

Recommended Citation

Koster, Paul; Schreven, Sander; Beek, Peter J.; and David, Sina (2024) "DOES THE ALIGNMENT OF THE FORCE VECTOR AND THE CENTRE OF MASS TRAJECTORY AFFECT TUMBLE TURN PERFORMANCE?," ISBS Proceedings Archive: Vol. 42: Iss. 1, Article 229.
Available at: https://commons.nmu.edu/isbs/vol42/iss1/229