A biomechanical analysis of the heavy sprint-style sled pull and comparison with the back squat

This study compared the biomechanical characteristics of the heavy sprint-style sled pull and squat. Six experienced male strongman athletes performed sled pulls and squats at 70% of their 1RM squat. Significant kinematic and kinetic differences were observed between the sled pull start and squat at the start of the concentric phase and at maximum knee extension. The first stride of the heavy sled pull demonstrated significantly (

A mathematical modelling study of an athlete's sprint time when towing a weighted sled

This is the author's accepted manuscript. The final publication is available at Springer via http://dx.doi.org/10.1007/s12283-013-0114-2.This study used a mathematical model to examine the effects of the sled, the running surface, and the athlete on sprint time when towing a weighted sled. Simulations showed that ratio scaling is an appropriate method of normalising the weight of the sled for athletes of different body size. The relationship between sprint time and the weight of the sled was almost linear, as long as the sled was not excessively heavy. The athlete’s sprint time and rate of increase in sprint time were greater on running surfaces with a greater coefficient of friction, and on any given running surface an athlete with a greater power-to-weight ratio had a lower rate of increase in sprint time. The angle of the tow cord did not have a substantial effect on an athlete’s sprint time. This greater understanding should help coaches set the training intensity experienced by an athlete when performing a sled-towing exercise

Sled acceleration control for low speed impact testing and transient response studies

Whiplash Associated Disorder is the most common soft-tissue injury arising from low-speed car crashes (Siskind et al. 2013). To better understand whiplash injury mechanisms in the head-neck system, a sled was acquired. The sled was previously controlled in open loop mode, without any feedback of the resulting motion. The aim of this project is to safely control the motion and acceleration of the sled in order to be able to generate reproducible acceleration profiles.FSR (Fondation Sécurité Routière

Using hair as an Indicator of Mercury Exposure in Sled Dogs

• The Alaskan sled dog is a mixed breed that has traditionally been bred for endurance, speed and strength. This study included eight Alaskan sled dogs. • Sled dogs are found only in close connection with human populated (especially Arctic) areas and are a good example of a species that is subject to many of the same environmental factors as humans and Arctic wildlife. • One environmental factor of significant importance is mercury present in foods. Mercury is both a naturally occurring element and byproduct of human industries

Effect of the coefficient of friction of a running surface on sprint time in a sled-towing exercise

This is an Author's Accepted Manuscript of an article published in Sports Biomechanics, 12(2), 175 - 185, 2013, copyright Taylor & Francis, available online at: http://www.tandfonline.com/10.1080/14763141.2012.726638,This study investigated the effect of the coefficient of friction of a running surface on an athlete's sprint time in a sled-towing exercise. The coefficients of friction of four common sports surfaces (a synthetic athletics track, a natural grass rugby pitch, a 3G football pitch, and an artificial grass hockey pitch) were determined from the force required to tow a weighted sled across the surface. Timing gates were then used to measure the 30-m sprint time for six rugby players when towing a sled of varied weight across the surfaces. There were substantial differences between the coefficients of friction for the four surfaces (μ = 0.21–0.58), and in the sled-towing exercise the athlete's 30-m sprint time increased linearly with increasing sled weight. The hockey pitch (which had the lowest coefficient of friction) produced a substantially lower rate of increase in 30-m sprint time, but there were no significant differences between the other surfaces. The results indicate that although an athlete's sprint time in a sled-towing exercise is affected by the coefficient of friction of the surface, the relationship relationship between the athlete's rate of increase in 30-m sprint time and the coefficient of friction is more complex than expected

Two applications of difference methods to chains of linear oscillators

M.S.M. B. Sled