Speed Bounding on Sloped Surfaces

 Abstract The purpose of this study was to determine whether there was a dose-response relationship between muscle activity during a propulsive phase of speed bounding on sloped surfaces in youth male sprinters. In a randomized, crossover counterbalanced design, 12 male sprinters (age: 15.75 [+ or -] 0.45 yrs, height: 1.72 [+ or -] 0.06 m), performed …

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Vertical Jump Metrics and Phases During a 60 m Sprint

Abstract – Purpose: This study aimed to investigate the relationships between vertical jump metrics and phases during a 60 m sprint. The variances in strength qualities between sprinters of different ability levels were also compared.Methods: Eighteen young male elite sprinters (age: 18.1 ± 1.3 years; stature: 1.72 ± 0.07 m; body mass: 66.3 ± 6.2 kg) were assessed for squat (SJ), countermovement (CMJ), drop (DJ), and standing …

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Ground Reaction Force, Ground Contact Time, GCT, Stride Rate, Flight Time and Braking Force During the Deceleration Phase of a Long Sprint

Abstract: This study aimed to elucidate changes in spatiotemporal and ground reaction force (GRF) variables during 90-m overground decelerated sprinting and determinants of the decrease in running speed. In 14 sub-elite male sprinters, a virtual 90-m sprint was reconstructed during which spatiotemporal and GRF variables were averaged for four steps in maximal speed (45.8-m mark) …

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Step Straightness and Sprint Performance

Abstract: A 100-m race is essentially running from point A to point B as quickly as possible, thus, deviations from a straight linear path may cause performance detriments. This study elucidates the importance of running straight during linear sprinting. A new descriptive characteristic of sprint running (step straightness) was defined and measured, representing the mediolateral …

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Kinetic and Kinematic Determinants of Female Sprint Performance

Abstract: This study elucidated spatiotemporal and ground reaction force determinants of running speed and acceleration for female sprinters during the entire sprinting. Fifteen female sprinters completed 60 m sprints. Kinematic and kinetic variables were measured using force platforms over a 50 m distance from the start. Results demonstrated that higher step frequency (11th–27th steps, r …

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Ground Reaction Force First Step Kinetics and Sprint Performance in Soccer Players

Abstract – Background: Sprint running is a key determinant of player performance in soccer that is typically assessed and monitored using temporal methods. Purpose: The aim of this study was to examine the relationship between ground reaction force kinetics at the first step and sprint running performance in soccer players in order to enhance the development of training …

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Biological Maturity and Ground Reaction Force Production

Abstract: Sprint ability develops nonlinearly across childhood and adolescence. However, the underpinning ground reaction force (GRF) production is not fully understood. This study aimed to uncover the kinetic factors that explain these maturation-related sprint performance differences in Japanese boys and girls. A total of 153 untrained schoolchildren (80 boys, 73 girls) performed two 50-m maximal …

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Ground Reaction Force During Sprint Acceleration

Abstract: Abrupt changes in kinematics during sprint acceleration called transitions have previously been observed. This study aimed to examine whether ground reaction force (GRF) variables during sprint acceleration also show specific features of the transitions. Twenty-one male sprinters performed 60-m sprints, during which GRF data were recorded. Step-to-step spatiotemporal and GRF variables were approximated using …

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Sensor Insole and Measurement of Ground Reaction Force

Ryu Nagahara, Jean-Benoit Morin. 2018. Sensor insole for measuring temporal variables and vertical force during sprinting. Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology. January 19 Research Article https://doi.org/10.1177/1754337117751730ABSTRACTTemporal variables and vertical ground reaction force have been used as measures characterizing sprinting. A recently developed wireless pressure sensor insole (sensor insole) …

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Built for Speed: Musculoskeletal Structure and Sprinting Ability

 Abstract: The musculoskeletal structure of the foot and ankle has the potential to influence human sprinting performance in complex ways. A large Achilles’ tendon moment arm improves the mechanical advantage of the triceps surae but also produces larger shortening velocity during rapid plantar-flexion, which detracts from the force-generating capacity of the plantar-flexors. The lever arm …

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