Accuracy of single beam timing lights for determining velocities in a flying 20-m sprint: Does timing light height matter?

Altmann, Stefan; Spielmann, Max; Engel, Florian; Ringhof, Steffen; Oriwol, Doris; Härtel, Sascha; Neumann, Rainer

doi:10.14198/jhse.2018.133.10

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…The utilization of a flying start distance is frequently suggested from a measurement standpoint to prevent untimely activation of the timing system caused by elevated knees or swinging arms. This recommendation is supported by various studies [35,[37][38][39][40]. A flying start at the beginning of a short sprint can also be attributed to the act of body rocking during the initial standing start.…”

Section: Inaccuracies In Estimated Parameters Using Timing Gates Due ...mentioning

confidence: 75%

Effects of the Flying Start on Estimated Short Sprint Profiles Using Timing Gates

Jovanović,

Cabarkapa,

Andersson

et al. 2024

Sensors

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Short sprints are predominantly assessed using timing gates and analyzed through parameters of the mono-exponential equation, including estimated maximal sprinting speed (MSS) and relative acceleration (TAU), derived maximum acceleration (MAC), and relative propulsive maximal power (PMAX), further referred to as the No Correction model. However, the frequently recommended flying start technique introduces a bias during parameter estimation. To correct this, two additional models (Estimated TC and Estimated FD) were proposed. To estimate model precision and sensitivity to detect the change, 31 basketball players executed multiple 30 m sprints. Athlete performance was simultaneously measured by a laser gun and timing gates positioned at 5, 10, 20, and 30 m. Short sprint parameters were estimated using a laser gun, representing the criterion measure, and five different timing gate models, representing the practical measures. Only the MSS parameter demonstrated a high agreement between the laser gun and timing gate models, using the percent mean absolute difference (%MAD) estimator (%MAD < 10%). The MSS parameter also showed the highest sensitivity, using the minimum detectable change estimator (%MDC95), with an estimated %MDC95 < 17%. Interestingly, sensitivity was the highest for the No Correction model (%MDC95 < 7%). All other parameters and models demonstrated an unsatisfying level of sensitivity. Thus, sports practitioners should be cautious when using timing gates to estimate maximum acceleration indices and changes in their respective levels.

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Section: Inaccuracies In Estimated Parameters Using Timing Gates Due ...mentioning

confidence: 75%

Effects of the Flying Start on Estimated Short Sprint Profiles Using Timing Gates

Jovanović,

Cabarkapa,

Andersson

et al. 2024

Sensors

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Bias in estimated short sprint profiles using timing gates due to the flying start: simulation study and proposed solutions

Jovanović

2023

Computer Methods in Biomechanics and Biomedical Engineering

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Test-retest reliability and comparison of single- and dual-beam photocell timing system with video-based applications to measure linear and change of direction sprint times

Thapa,

Sarmah,

Singh

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part P:

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This study aimed to assess the test-retest reliability of untested single- and dual-beam timing gates and compare them with previously validated video-based applications to measure linear and change of direction sprint (CODS) times. Twenty-three participants were concurrently assessed for 30 m linear sprint and CODS time using single- and dual-beam timing gates and the MySprint and COD Timer applications. Interclass correlation coefficient (ICC), Pearson correlation, independent t-test and Bland-Altman plots were used for comparison between instruments. ICC, Cronbach’s alpha and coefficient of variation (CV) analyses were used to assess the test-retest reliability. Excellent ICC was noted for test-retest reliability (0.982–0.984 [sprint], 0.940–0.942 [CODS]), with a high Cronbach’s alpha (all 0.997 [sprints], 0.988–0.989 [CODS]) and acceptable CV (1.296–1.946%) for all the timing systems. Similarly, excellent ICC (0.989–0.994 [sprint], 0.998–0.999 [CODS]) and very high correlation ( r = 0.990–0.994 [sprints] and r = 0.998–1.000 [CODS]) were reported between the single- and dual-beam timing gates, and the MySprint and COD Timer applications, with non-significant differences between the measurements ( p = 0.754–0.960). However, the Bland-Altman plots represented that values measured with the three instruments were inconsistent with most values away from the mean of the difference between instruments. In conclusion, both photocell timing systems are reliable instruments for measuring linear sprint time and CODS time. However, the timing systems should not be used interchangeably to interpret findings. Furthermore, it is suggested that similar timing systems with an identical setup should be used for the measurement of timings for interpretations.

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Accuracy of single beam timing lights for determining velocities in a flying 20-m sprint: Does timing light height matter?

Cited by 3 publications

References 22 publications

Effects of the Flying Start on Estimated Short Sprint Profiles Using Timing Gates

Effects of the Flying Start on Estimated Short Sprint Profiles Using Timing Gates

Bias in estimated short sprint profiles using timing gates due to the flying start: simulation study and proposed solutions

Test-retest reliability and comparison of single- and dual-beam photocell timing system with video-based applications to measure linear and change of direction sprint times

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