Criterion validity and accuracy of global positioning satellite and data logging devices for wheelchair tennis court movement

Sindall, PA, Lenton, JP, Whytock, K, Tolfrey, K, Oyster, ML, Cooper, RA and Goosey-Tolfrey, VL 2013, 'Criterion validity and accuracy of global positioning satellite and data logging devices for wheelchair tennis court movement' , Journal of Spinal Cord Medicine, 36 (4) , pp. 383-393.

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Abstract

Purpose: To compare the criterion validity and accuracy of a 1 Hz non-differential global positioning system (GPS) and data logger device (DL) for the measurement of wheelchair tennis court movement variables. Methods: Initial validation of the DL device was performed. GPS and DL were fitted to the wheelchair and used to record distance (m) and speed (m/second) during (a) tennis field (b) linear track, and (c) match-play test scenarios. Fifteen participants were monitored at the Wheelchair British Tennis Open. Results: Data logging validation showed underestimations for distance in right (DLR) and left (DLL) logging devices at speeds >2.5 m/second. In tennis-field tests, GPS underestimated distance in five drills. DLL was lower than both (a) criterion and (b) DLR in drills moving forward. Reversing drill direction showed that DLR was lower than (a) criterion and (b) DLL. GPS values for distance and average speed for match play were significantly lower than equivalent values obtained by DL (distance: 2816 (844) vs. 3952 (1109) m, P = 0.0001; average speed: 0.7 (0.2) vs. 1.0 (0.2) m/second, P = 0.0001). Higher peak speeds were observed in DL (3.4 (0.4) vs. 3.1 (0.5) m/second, P = 0.004) during tennis match play. Conclusions: Sampling frequencies of 1 Hz are too low to accurately measure distance and speed during wheelchair tennis. GPS units with a higher sampling rate should be advocated in further studies. Modifications to existing DL devices may be required to increase measurement precision. Further research into the validity of movement devices during match play will further inform the demands and movement patterns associated with wheelchair tennis.

Item Type:	Article
Themes:	Health and Wellbeing
Schools:	Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title:	Journal of Spinal Cord Medicine
Publisher:	Academy of Spinal Cord Injury Professionals (ASCIP)
Refereed:	Yes
ISSN:	1079-0268
Related URLs:	Publication
Funders:	University of Salford
Depositing User:	Dr P A Sindall
Date Deposited:	13 Jun 2014 17:03
Last Modified:	11 Oct 2018 00:49
URI:	http://usir.salford.ac.uk/id/eprint/31941

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