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Matthew I. Black, Joseph C. Handsaker, Sam J. Allen, Stephanie E. Forrester and Jonathan P. Folland

Distance-running performance is dependent on the speed that can be sustained for the duration of an event. This speed is determined by the interaction of several physiological factors 1 that include maximal rate of oxygen uptake ( V ˙ O 2 max ), anaerobic capacity, fractional utilization of V ˙ O

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Sergio L. Molina and David F. Stodden

practices of practitioners (e.g., physical educators, coaches, and other movement educators). Fitts’ law ( 1954 ) and its application, the speed-accuracy trade-off, are well-known principles that can be applied to many fundamental movements and performance ( Urbin, Stodden, Fischman, & Weimer, 2011

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Robert W. Meyers, Jonathan L. Oliver, Michael G. Hughes, John B. Cronin and Rhodri S. Lloyd

The purpose of this study was to examine the natural development of the mechanical features of sprint performance in relation to maturation within a large cohort of boys. Three hundred and thirty-six boys (11-15 years) were analyzed for sprint performance and maturation. Maximal speed, stride length (SL), stride frequency (SF), flight time (FT) and contact time (CT) were assessed during a 30m sprint. Five maturation groups (G1-5) were established based on age from peak height velocity (PHV) where G1=>2.5years pre-PHV, G2 = 2.49-1.5years pre-PHV, G3 = 1.49-0.5years pre-PHV, G4 = 0.49years pre- to 0.5years post-PHV and G5 = 0.51-1.5years post-PHV. There was no difference in maximal speed between G1, G2 and G3 but those in G4 and G5 were significantly faster (p < .05) than G1-3. Significant increases (p < .05) in SL were observed between groups with advancing maturation, except G4 and G5 (p > .05). SF decreased while CT increased (both p < .05) between G1, G2 and G3, but no further significant changes (p > .05) were observed for either variable between G3, G4 and G5. While G1-3 increased their SL, concomitant decreases in SF and increases in CT prevented them from improving maximal speed. Maximal sprint speed appears to develop around and post-PHV as SF and CT begin to stabilize, with increases in maximal sprint speed in maturing boys being underpinned by increasing SL.

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Johan Cassirame, Hervé Sanchez and Jean-Benoit Morin

is a jumping event, accelerated running mechanics and performance are of utmost importance and several studies have identified that run-up terminal speed (Spt) is a major determinant of overall pole-vault performance. 9 – 13 A preliminary study conducted recently 14 showed a possibly beneficial

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Gareth N. Sandford, Simon Pearson, Sian V. Allen, Rita M. Malcata, Andrew E. Kilding, Angus Ross and Paul B. Laursen

differentials (delta) were assessed using magnitude-based inferences. 6 The threshold values used for effect-size (ES) statistics were ≥0.2 (small), >0.6 (moderate), >1.2 (large), and >2.0 (very large). The smallest worthwhile change (SWC) for lap differential and 100-m sector speed over time was determined as

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Jake Schuster, Dan Howells, Julien Robineau, Anthony Couderc, Alex Natera, Nick Lumley, Tim J. Gabbett and Nick Winkelman

study of the 2013 men’s World Rugby Sevens Series, competitors cover nearly 1500 m per match, of which over 250 m are at high speed (>5 m/s), with a mean peak velocity of over 8 m/s. On average players take 3.5 ± 2.5 ball carries, 2.4 ± 2.3 tackles, and 2.3 ± 3.9 total rucks per match in pool play, with

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Paul G. Montgomery and Brendan D. Maloney

(direction) data were collected as per unit specifications for the accumulation of jumps in low (<20 cm), medium (20–40 cm), and high bands (>40 cm); high-speed change of direction for right and left (>3.5 m·s −1 ); accelerations and decelerations in low (<2.5 m·s −1 ), medium (2.5–3.5 m·s −1 ), and high

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Simon A. Feros, Warren B. Young and Brendan J. O’Brien

, Glenn McGrath, James Anderson), whereas others can bowl at express speeds (eg, Brett Lee, Shoaib Akhtar). Despite these differences, the objective of the bowling attack is to minimize runs scored by the batting side while dismissing opposition batters. Currently, the International Cricket Council (ICC

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Marcus J. Brown, Laura A. Hutchinson, Michael J. Rainbow, Kevin J. Deluzio and Alan R. De Asha

number of strides during which data are collected, and finishes with a termination. Even though this is clearly not a typical, everyday walking scenario, the discrete measurements obtained are considered to be representative of individuals’ typical walking. Walking speed has long been acknowledged as a

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James M. Rhodes, Barry S. Mason, Thomas A.W. Paulson and Victoria L. Goosey-Tolfrey

has revealed that WCR is an intermittent sport with players typically covering distances of 2500 and 4600 m during competition 3 , 4 and the majority of time spent performing low-speed activities interspersed with frequent bouts of high-speed activities. 3 Classification has also been shown to