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Kosuke Tamura, Jeffrey S. Wilson, Robin C. Puett, David B. Klenosky, William A. Harper and Philip J. Troped

accelerometers and global positioning system (GPS) units can be used to quantify PA occurring on trails and thereby provide a better understanding of how community trails can support regular PA. 23 , 24 To date, researchers have concurrently used these devices to objectively assess how much PA occurs at home

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Tim Op De Beéck, Arne Jaspers, Michel S. Brink, Wouter G.P. Frencken, Filip Staes, Jesse J. Davis and Werner F. Helsen

system with an integrated 10-Hz global positioning system and accelerometer technology (OptimEye S5; Catapult Sports, Melbourne, Australia). This system is considered a reliable tool for measuring EL that obtains an acceptable level of accuracy for quantifying various locomotor activities. 17 The

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

-water immersion; G, game; GPS, global positioning systems; RPE, rating of perceived exertion; Tc, core temperature (ingestible telemetric pill); TC, thermal comfort; TS, thermal sensation; WU, warm-up. Statistical Analyses Statistical analyses were performed using the Statistical Package for the Social Sciences

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Mathieu Lacome, Ben Simpson, Nick Broad and Martin Buchheit

-based external load measures (ie, locomotor activity during small-sided games [SSG]) tracked with global positioning system (GPS) and an objective measure of internal load (ie, HR response to the same drills) in 10 elite soccer players. The second aim was to examine the ability of each individual model to

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Harry E. Routledge, Jill J. Leckey, Matt J. Lee, Andrew Garnham, Stuart Graham, Darren Burgess, Louise M. Burke, Robert M. Erskine, Graeme L. Close and James P. Morton

external loading during match play was assessed via global positioning system technology. Dietary Controls In the day prior to match play, each player consumed a prescribed CHO loading diet providing CHO, protein, and fat intakes corresponding to 8, 2, and 1 g/kg body mass, respectively, based on

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Liam Anderson, Graeme L. Close, Ryland Morgans, Catherine Hambly, John Roger Speakman, Barry Drust and James P. Morton

contractions etc) that are not often considered when using global positioning system (GPS) data to make inferences of daily EE. Methods Overview of the Player The player is a 27-year old male professional GK (body mass 85.6 kg, height 191 cm from a headless scan, percentage body fat 11.9%, fat mass 9.8 kg

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

ecologically valid setting. The experimental aims were therefore to use a phase-change cooling vest within elite WRSS players during an externally valid match-day warm-up. Specifically, the performance (countermovement jump [CMJ]), physical (global positioning system [GPS] metrics), and psychophysiological

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Martin Buchheit, Hani Al Haddad, Ben M. Simpson, Dino Palazzi, Pitre C. Bourdon, Valter Di Salvo and Alberto Mendez-Villanueva

The aims of the current study were to examine the magnitude of between-GPS-models differences in commonly reported running-based measures in football, examine between-units variability, and assess the effect of software updates on these measures. Fifty identical-brand GPS units (15 SPI-proX and 35 SPIproX2, 15 Hz, GPSports, Canberra, Australia) were attached to a custom-made plastic sled towed by a player performing simulated match running activities. GPS data collected during training sessions over 4 wk from 4 professional football players (N = 53 files) were also analyzed before and after 2 manufacturersupplied software updates. There were substantial differences between the different models (eg, standardized difference for the number of acceleration >4 m/s2 = 2.1; 90% confidence limits [1.4, 2.7], with 100% chance of a true difference). Between-units variations ranged from 1% (maximal speed) to 56% (number of deceleration >4 m/s2). Some GPS units measured 2–6 times more acceleration/deceleration occurrences than others. Software updates did not substantially affect the distance covered at different speeds or peak speed reached, but 1 of the updates led to large and small decreases in the occurrence of accelerations (–1.24; –1.32, –1.15) and decelerations (–0.45; –0.48, –0.41), respectively. Practitioners are advised to apply care when comparing data collected with different models or units or when updating their software. The metrics of accelerations and decelerations show the most variability in GPS monitoring and must be interpreted cautiously.

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Javier Yanci, Daniel Castillo, Aitor Iturricastillo, Tomás Urbán and Raúl Reina

capacity. 4 – 7 However, only 2 scientific studies have been focused on analyzing official matches. 8 , 9 Boyd et al, 9 using global positioning system (GPS) monitors, analyzed the total distance (TD) covered, as well as the distance covered at high and very high intensity, in 40 high-level footballers

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Arne Jaspers, Tim Op De Beéck, Michel S. Brink, Wouter G.P. Frencken, Filip Staes, Jesse J. Davis and Werner F. Helsen

internal load represents the psychophysiological stress experienced by the player. 2 The external load is generally defined as all locomotor and nonlocomotor activities performed by players. 2 , 3 Global positioning systems (GPSs) and inertial sensors are used for monitoring external load indicators