ISSN: 1899-1955
Human Movement
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3/2017
vol. 18
 
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abstract:
Original paper

Take-off efficiency: transformation of mechanical work into kinetic energy during the Bosco test

Sona Jandova
1
,
Michal Musilek
2
,
Andrew J. Martin
3
,
Darryl Cochrane
3
,
Jiri Rozkovec
1

1.
Technical University of Liberec, Liberec, the Czech Republic
2.
University of Hradec Králové, Hradec Králové, the Czech Republic
3.
Massey University, Palmerston North, New Zealand
Online publish date: 2018/02/26
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Purpose
The aim of the study is to present a new method for determining the efficiency of take-off during a 60-s Bosco repeated vertical jump test.

Methods
The study involved 15 physical education students (age: 21.5 ± 2.4 years; height: 1.81 ± 0.08 m; mass: 76 ± 9 kg). The data were collected with the use of a pedobarographical system (Pedar-x; Novel, Munich, Germany). The statistical analysis utilized a simple linear regression model.

Results
Owing to possible fatigue, flight time and flight height decreased. The average flight height was 0.260 ± 0.063 m, and the average contact time equalled 0.54 ± 0.16 s. The average anaerobic power values calculated for the 60-s work period had the mean value of 21.9 ± 6.7 W • kgBW–1; there was a statistically significant (p < 0.05) decrease in anaerobic power during the 60-s Bosco test.

Conclusions
The efficiency of mechanical work was highest at the beginning of the test, reaching values of up to 50%. The efficiency of mechanical work conversion into mechanical energy seems to be an appropriate determinant of rising fatigue during the 60-s Bosco jumping test.

keywords:

velocity, contact time, vertical force, counter-movement jump, flight time

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