References in periodicals archive ?
The jump mat can measure and calculate GCT, flight time, VJH, and efficiency during DJ.
The data of the force plate were collected as follows: the GCT during the first foot contact until the foot breaks contact again (in milliseconds: ms) was measured and the VJH (in millimeters: mm) was calculated.
The Pearson correlation coefficient (r) was calculated for the association between the values VJH and GCT of the force plate and the jump mat.
The VJH on the jump mat represent larger values for heights compared to the force plate, and this difference increases slightly with larger jump heights.
A very strong correlation was determined between the two devices (HE jump mat and force plate) for VJH and GCT.
The Bland-Altman plot shows that the HE jump mat records generally underestimated VJH and overestimated GCT.
Finally, it should be mentioned that the interpretation of the relevance of the differences in mean difference and confidence limits at the GCT and the VJH is dependent on the situation, and the aim of the measurement.
These results are in agreement with the findings of Vetter (28) who used 60 sec of PS to evaluate the deleterious effects on VJH. On the other hand, there are studies that used 45 sec (15,18,27), 60 sec (21) and 90 sec (4,16,23) of static stretching (i.e., a term also used for passive stretching, PS) and found no interference on the subjects' VJH.
More studies should be conducted of different intensities of stretching such as sub- threshold static stretching and stretching at a discomfort threshold with the use of different techniques of VJ (drop jump and the squat jump) in order to verify the influence in the VJH performance.
Acronyms browser ?
Full browser ?
- Vjekoslav Karas
- Vjekoslav Klaic
- Vjenceslav Novak
- Vjetnama Esperantista Junulara Organizo