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Related Experiment Videos

Measuring running speed using photocells.

M R Yeadon1, T Kato, D G Kerwin

  • 1Department of Sport Science, Physical Education and Recreation Management, Loughborough University, UK.

Journal of Sports Sciences
|June 11, 1999
PubMed
Summary
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Double beam photocell timing systems offer greater accuracy for measuring running speed compared to single beam systems. Optimizing photocell separation and trigger criteria can minimize speed measurement errors.

Area of Science:

  • Biomechanics
  • Sports Science
  • Athletic Performance Analysis

Background:

  • Photocell timing systems are widely used in sports and biomechanics to measure running speed.
  • Accurate speed measurement is crucial for performance analysis and training feedback.

Purpose of the Study:

  • To evaluate the accuracy of photocell timing systems for measuring running speed.
  • To compare the performance of single beam and double beam systems with varying photocell separations and trigger criteria.

Main Methods:

  • Running speeds were measured using single and double beam photocell systems.
  • Three-dimensional video analysis of the center of mass was used as the criterion measure.
  • The study tested five nominal speeds (5-9 m/s) and five photocell separations (1.6-2.4 m).

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  • Different trigger criteria were applied for both single and double beam systems.

    • Main Results:

    • Double beam systems generally exhibited smaller root mean square speed errors than single beam systems.
    • The 'longest break' trigger criterion resulted in lower errors compared to the 'first break' criterion.
    • Increased photocell separation generally led to reduced speed errors.
    • A single beam system achieved an error of 0.1 m/s with a 'longest break' criterion at hip height and separations around two stride lengths.

    Conclusions:

    • Double beam photocell systems provide a more accurate and robust method for measuring running speed.
    • The 'longest break' criterion and optimal photocell separation enhance accuracy in single beam systems.
    • Double beam systems offer consistent accuracy without requiring adjustments for different stride lengths.