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Paul Sindall, John P. Lenton, Keith Tolfrey, Rory A. Cooper, Michelle Oyster and Victoria L. Goosey-Tolfrey

Purpose:

To examine the heart-rate (HR) response and court-movement variables during wheelchair tennis match play for high- (HIGH) and low- (LOW) performance-ranked players. Analysis of physiological and movement-based responses during match play offers an insight into the demands of tennis, allowing practical recommendations to be made.

Methods:

Fourteen male open-class players were monitored during tournament match play. A data logger was used to record distance and speed. HR was recorded during match play.

Results:

Significant rank-by-result interactions revealed that HIGH winners covered more forward distance than HIGH losers (P < .05) and had higher average (P < .05) and minimum (P < .01) HRs than LOW winners. LOW losers had higher average (P < .01) and minimum (P < .001) HRs than LOW winners. Independent of result, a significant main effect for rank was identified for maximum (P < .001) and average (P < .001) speed and total (P < .001), reverse (P < .001), and forward-to-reverse (P < .001) distance, with higher values for HIGH. Independent of rank, losing players experienced higher minimum HRs (P < .05). Main effects for maximum HR and actual playing time were not significant. Average playing time was 52.0 (9.1) min.

Conclusions:

These data suggest that independent of rank, tennis players were active for sufficient time to confer health-enhancing effects. While the relative playing intensity is similar, HIGH players push faster and farther than LOW players. HIGH players are therefore more capable of responding to ball movement and the challenges of competitive match play. Adjustments to the sport may be required to encourage skill developmental in LOW players, who move at significantly lower speeds and cover less distance.

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Karen P. DePauw

This study was undertaken to investigate the total body and segmental centers of mass of individuals with Down’s syndrome. The 40 subjects were divided equally by gender into the following age groups: (a) ages 6 to 10, (b) ages 11 to 18, (c) adult females, and (d) adult males. Data on mass centroid locations were collected through a photogrammetric technique. Frontal and right sagittal-view slide photographs on each subject were digitized and the data logged into a computer program. The program calculated the segmental mass centroid locations and total body center of mass. Differences in total body and segmental center of mass locations were found between individuals with Down’s syndrome (DS) and nonhandicapped individuals. Analysis of the data on the DS children indicated that the mean center of mass location for the total body was within the range reported for nonhandicapped children. The adult DS male and female subjects were found to have a lower total body center of mass when compared to existing data on nonhandicapped adults. It was also found that the segmental mass centroid locations for the head and trunk segment of DS subjects were consistently lower than those found in nonhandicapped individuals. This finding points to an overall lowering of the center of mass found with DS subjects.

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Martin J. Barwood, Joe Kupusarevic and Stuart Goodall

humidity. Environmental conditions were measured by a wet-bulb, globe, temperature station (1000 series, Squirrel Data Logger; Grant Instruments Ltd). One minute prior to the start of exercise, all data logging systems were activated and synchronized. Prior to the commencement in exercise, participants

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Lee Taylor, Christopher J. Stevens, Heidi R. Thornton, Nick Poulos and Bryna C.R. Chrismas

.026344 17178778 10.1136/bjsm.2006.026344 18. Travers GJ , Nichols DS , Farooq A , Racinais S , Periard JD . Validation of an ingestible temperature data logging and telemetry system during exercise in the heat . Temperature . 2016 ; 3 ( 2 ): 208 – 219 . doi:10.1080/23328940.2016.1171281 10

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Mitchell J. Henderson, Bryna C.R. Chrismas, Christopher J. Stevens, Aaron J. Coutts and Lee Taylor

, Périard JD . Validation of an ingestible temperature data logging and telemetry system during exercise in the heat . Temperature . 2016 ; 3 ( 2 ): 208 – 219 . doi:10.1080/23328940.2016.1171281 10.1080/23328940.2016.1171281 15. Periard JD , Racinais S , Timpka T , et al . Strategies and

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Mário A.M. Simim, Marco Túlio de Mello, Bruno V.C. Silva, Dayane F. Rodrigues, João Paulo P. Rosa, Bruno Pena Couto and Andressa da Silva

), 527 – 533 . PubMed doi:10.1080/02640414.2014.949829 10.1080/02640414.2014.949829 Sindall , P. , Lenton , J. , Whytock , K. , Tolfrey , K. , Oyster , M.L. , Cooper , R.A. , & Goosey-Tolfrey , V. ( 2013 ). Criterion validity and accuracy of global positioning satellite and data logging