Methodological Considerations When Quantifying High-Intensity Efforts in Team Sport Using Global Positioning System Technology

Varley, Matthew C.; Jaspers, Arne; Helsen, Werner; Malone, James J.

doi:10.1123/ijspp.2016-0534

Cited by 87 publications

(99 citation statements)

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“…High accelerations were defined as efforts commencing above a threshold corresponding to either 70 % (T70 %) or 80 % (T80 %) of the average 5-m acceleration of all players obtained during a 40-m sprint test (2.62 ± 0.30 and 3.00 ± 0.26 m • s − 2 , respectively). An effort was required to remain above threshold for 0.3 s to be considered and was concluded when acceleration returned to or fell below 0 m • s − 2 [18]. RHAA bouts were defined as ≥ 3 efforts with ≤ 45 s recovery between each effort.…”

Section: Methodsmentioning

confidence: 99%

The Occurrence of Repeated High Acceleration Ability (RHAA) in Elite Youth Football

et al. 2018

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The aim of the present study was to investigate the occurrence of Repeated High-Acceleration Ability (RHAA) bouts in elite youth football games using 10-Hz GPS devices and two relative thresholds derived from players' actual maximal acceleration. Thirty-six outfield soccer players (age 14.9±0.6 years) participated in the study. Players wore 10-Hz GPS units during 41 official games. High accelerations were defined as efforts commencing above a threshold corresponding to 70% (T70%) or 80% (T80%) of the average 5-m acceleration obtained during a 40-m sprint test; RHAA bouts were defined as ≥3 efforts with ≤45 s recovery between efforts. Results were analysed via generalised linear mixed model and magnitude-based inferential statistics. On average, 8.0±4.6 and 5.1±3.5 bouts were detected in an entire game using T70% and T80%, respectively. When all positions were analysed together, there was a very-likely small difference in the number of RHAA bouts between first and second half for T70% and T80%, respectively. RHAA bouts occur frequently in elite youth football, with small differences between halves and between playing positions within the first or second half in most variables assessed.

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Section: Methodsmentioning

confidence: 99%

The Occurrence of Repeated High Acceleration Ability (RHAA) in Elite Youth Football

et al. 2018

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“…The following variables were included for data analysis: total distance (TD), high-speed distance (HSD, > 5.5 m/s − 1 ), and sprint distance (SPR, > 7.0 m/s − 1 ). The minimum effort duration for velocity-based variables was set at 0.4 secs in line with previous recommendations [46].…”

Section: Quantifying Workloadmentioning

confidence: 99%

Workload and Injury in Professional Soccer Players: Role of Injury Tissue Type and Injury Severity

et al. 2019

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The purpose of the present study was to examine the influence of workload prior to injury on injury (tissue type and severity) in professional soccer players. Twenty-eight days of retrospective training data prior to non-contact injuries (n=264) were collated from 192 professional soccer players. Each injury tissue type (muscle, tendon and ligament) and severity (days missed) were categorised by medical staff. Training data were recorded using global positioning system (GPS) devices for total distance (TD), high speed distance (HSD,>5.5 m/s−1), and sprint distance (SPR,>7.0 m/s−1). Accumulated 1, 2, 3, 4-weekly loads and acute:chronic workload ratios (ACWR) (coupled, uncoupled and exponentially weighted moving average (EWMA) approaches) were calculated. Workload variables and injury tissue type were compared using a one-way ANOVA. The association between workload variables and injury severity were examined using a bivariate correlation. There were no differences in accumulated weekly loads and ACWR calculations between muscle, ligament, and tendon injuries (P>0.05). Correlations between each workload variable and injury severity highlighted no significant associations (P>0.05). The present findings suggest that the ability of accumulated weekly workload or ACWR methods to differentiate between injury type and injury severity are limited using the present variables.

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“…However, it is important to note that, from a practical perspective, practitioners may be more inclined to report acceleration and deceleration efforts either as single efforts over a longer sampling period, such as 0.2 or 0.3s (Aughey, 2011) or as average values over longer phases of a game or training session (Delaney, Cummins, Thornton, & Duthie, 2017;Delaney et al, 2016). In both cases, the error associated with these variables may be greatly reduced (Varley, Jaspers, Helsen, & Malone, 2017), making them suitable to reflect human locomotion in sport.…”

Section: Comparison Of Linear Locomotor Activities Between Systemsmentioning

confidence: 99%

Validity of an ultra-wideband local positioning system to measure locomotion in indoor sports

Serpiello

Hopkins

Barnes

et al. 2017

Journal of Sports Sciences

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The validity of an Ultra-wideband (UWB) positioning system was investigated during linear and change-of-direction (COD) running drills. Six recreationally-active men performed ten repetitions of four activities (walking, jogging, maximal acceleration, and 45º COD) on an indoor court. Activities were repeated twice, in the centre of the court and on the side. Participants wore a receiver tag (Clearsky T6, Catapult Sports) and two reflective markers placed on the tag to allow for comparisons with the criterion system (Vicon). Distance, mean and peak velocity, acceleration, and deceleration were assessed. Validity was assessed via percentage least-square means difference (Clearsky-Vicon) with 90% confidence interval and magnitude-based inference; typical error was expressed as within-subject standard deviation. The mean differences for distance, mean/peak speed, and mean/peak accelerations in the linear drills were in the range of 0.2-12%, with typical errors between 1.2 and 9.3%. Mean and peak deceleration had larger differences and errors between systems. In the COD drill, moderate-to-large differences were detected for the activity performed in the centre of the court, increasing to large/very large on the side. When filtered and smoothed following a similar process, the UWB-based positioning system had acceptable validity, compared to Vicon, to assess movements representative of indoor sports.

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Methodological Considerations When Quantifying High-Intensity Efforts in Team Sport Using Global Positioning System Technology

Cited by 87 publications

References 0 publications

The Occurrence of Repeated High Acceleration Ability (RHAA) in Elite Youth Football

The Occurrence of Repeated High Acceleration Ability (RHAA) in Elite Youth Football

Workload and Injury in Professional Soccer Players: Role of Injury Tissue Type and Injury Severity

Validity of an ultra-wideband local positioning system to measure locomotion in indoor sports

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