A comparison between land and sand-based tests for beach volleyball assessment

Area of Science:

• Sports Science
• Biomechanics
• Athletic Performance

Background:

• Vertical jumping is crucial for beach volleyball success.
• Current testing often uses firm surfaces, unlike the sport's playing environment.
• The specificity of vertical jump testing to playing surface is not well understood.

Purpose of the Study:

• To investigate if vertical jumping ability is specific to the test surface (wood vs. sand).
• To determine the relationship between jump performance on different surfaces in beach volleyball players.

Main Methods:

• Eighteen beach volleyball players completed four vertical jump tests.
• Jumps were performed on both wood and sand surfaces in a counterbalanced order.
• Correlation coefficients analyzed the association between jumps and surface conditions.

Main Results:

• Jump heights were significantly lower on sand compared to wood (p<0.05).
• Strong correlations were found between land and sand jump results for all jumps (mean r=0.93, p<0.05).
• All jump variations correlated well (mean r=0.91, p<0.05), though static jumps and spike jumps showed slightly lower correlations.

Conclusions:

• Lower jump height on sand is likely due to reduced ground reaction force.
• Despite surface differences, vertical jumping ability appears to be a general trait.
• Land-based jump tests are suitable for assessing sand jumping ability in experienced beach volleyball players.