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Area of Science:

  • Sports Science
  • Biomechanics
  • Geophysics

Background:

  • Athletic power calculations commonly use a standard gravity value (g = 9.81 m·s⁻²).
  • This standard value is inaccurate as gravity varies with altitude and latitude.
  • Accurate power measurement is crucial for performance analysis in sports.

Purpose of the Study:

  • To enhance the precision of jump power calculations.
  • To investigate the impact of local gravity variations on power estimations.
  • To compare power calculations using standard versus local gravity values.

Main Methods:

  • A photoelectric cell system with infrared LEDs was used to measure jump flight and ground times.
  • Ten volleyball players performed repeated jump tests (15, 30, 60 s).
  • Power was calculated using both the standard gravity value and local gravity values from the Geodetic Reference System (GRS80) for 34 locations.

Main Results:

  • Significant differences in calculated power were observed between standard and local gravity values.
  • Higher altitude locations showed underestimation of power when using the standard value.
  • Lower altitude locations showed overestimation of power when using the standard value.

Conclusions:

  • The geographic location of experiments significantly affects jump power calculations.
  • Using local gravity values, such as those from GRS80, is recommended for improved accuracy.
  • Accurate gravity compensation is essential for reliable sports performance metrics.