Blog

Video Measures of Running Ground Contact Times and Vertical Ground Reaction Forces, by NASEinc

Abstract: Ground contact time (GCT) and vertical ground reaction force (VGRF) are key variables with Video Measures of Running Ground Contact Times and Vertical Ground Reaction Forcesregards to running performance, metabolic rate, and musculoskeletal stresses. However, there are few f
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Age‐Related Differences in Kinematics and Kinetics of Sprinting in Young Females, NASEinc

Abstract: This study aimed to investigate the age‐related differences in sprinting performance, kinematic and kinetic variables in girls aged between 7.0 and 15.3 years. Step‐to‐step spatiotemporal variables and ground reaction impulses during sprinting were collected in 94 Japanese g
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Bilateral Deficit During Jumping Tasks: Relationship With Speed and Change of Direction Speed Performance, NASEinc

Abstract Research to date has investigated the phenomenon of the bilateral deficit (BLD); however, limited research exists on its association with measures of athletic performance. The purpose of this study was to investigate the magnitude of the BLD and examine its relationship with
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Lower-Limb Stiffness and Sprinting Speed, Blog Entry by NASEinc

The purpose of the study was to examine the relationship between vertical stiffness, leg stiffness, and maximal sprint speed in a large cohort of 11–16-year-old boys. Three-hundred thirty-six boys undertook a 30-m sprint test using a floor-level optical measurement system, positioned
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Best Plyometric Exercises to Improve the Starting Phase of a Short Sprint, Blog Entry by NASEinc

Abstract This study determined the horizontal to vertical force ratio (H:V) of two types of sprint starts and a variety of plyometric exercise, for the purpose of determining the exercises which are most biomechanically specific to sprinting. Subjects included 15 men. All subjects’ pe
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Ground Reaction Force (GFR) and Acceleration, Blog Entry by NASEinc

Abstract: This study aimed to elucidate whether the peak (maximum) ground reaction force (GRF) can be used as an indicator of better sprint acceleration performance. Eighteen male sprinters performed 60-m maximal effort sprints, during which GRF for a 50-m distance was collected using
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Support for Vertically-directed Ground Reaction Force as a Limiting Factor, Blog Entry by NASEinc

Nagahara, et. al. (2017) conducted a well designed study to clarify the mechanical determinants of sprinting performance during the acceleration and maximal speed phases of a single sprint, using ground reaction forces (GRFs). While 18 male athletes performed a 60-m sprint, GRF was me
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The Measurement of Sprint Mechanics Using Instrumented Treadmills, Blog Entry by NASEinc

Abstract: Since sprinting involves very fast movement velocities (up to 12 m/s in the best athletes), experimental studies in this field have always been a technical challenge. While sprint kinematics and distance-time or velocity-time variables were first described by the end of the
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Hamstring Flexibility and Peak Hamstring Muscle Strain in Sprinting, Blog by NASEinc

Abstract and Background: The effect of hamstring flexibility on the peak hamstring muscle strains in sprinting, until now, remained unknown, which limited our understanding of risk factors of hamstring muscle strain injury (hamstring injury). As a continuation of our previous study, t
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Unloaded and Sled-resisted Sprinting, Blog Entry by NASEinc

Abstract: In this study, we sought to compare force-velocity relationships developed from unloaded sprinting acceleration to that compiled from multiple sled-resisted sprints. Twenty-seven mixed-code athletes performed six to seven maximal sprints, unloaded and towing a sled (20-120%
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