Case Studies

Written by: Hembre, A.1 and Eriksrud, O.2 1 Apex klinikken, Oslo, Norway 2 1080 Motion AB, Stockholm, Sweden Background In soccer, muscle injuries account for 25-31% of all injuries (Ueblacker, Muller-Wohlfahrt & Ekstrand, 2015; Ekstrand, Hagglund & Walden, 2011). Muscle injuries of the lower extremities dominate (92%), with injuries to the major muscle groups as […]

Jumping and sprinting are key performance indicators in basketball as indicated by their inclusion in the NBA Combine. Vertical jump is a classical power test, which is determined by the ability to generate force into the ground at increasing velocities. The interaction of force and velocity can be determined from single or multiple jumps and presented as a force-velocity (F-v) curve. In a single jump F-v curve information of how the athlete is able to generate force as the velocity increases is provided. From multiple jumps both F-v and load-velocity curves can be generated to determine how an athlete is able to generate force and speed across a continuum of loads.

Measuring sports performance using new robotic technology Eriksrud O.  Eriksrud1, O., 1Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway ol**********@ni*.no Objective measures of the physical factors (force, speed, power, work and energy) in different movement patterns is important in both testing and training as well as for rehabilitation and athletic development. Different technologies, […]

Relationship of rotational force, speed and power to golf performance Ola Eriksrud1 , Ali Ghelem1 , Jessica Parnevik-Muth1 1 1080 Motion, Stockholm, Sweden Introduction The physical factors that determine athletic performance are mobility, stability, force, speed, power and endurance. Current methods of testing of these physical factors have a tendency to focus on isolated joints […]

Athletic performance, such as throwing, kicking and hitting, can be quantified by the accuracy and velocity of the performance. For a batter in baseball this is to hit and give the ball high velocity in the right direction. High velocity of the ball after impact with the bat is dependent upon both the speed of the bat at impact and the type of collision between the bat and the ball. Speed of the bat is dependent upon the ability of the body to generate force and speed (power) throughout the body.

Performance in golf is measured by accuracy and distance, where the type of shot will determine their relative importance. The physical factors that determine golf performance are; mobility, stability, strength, power and endurance. Mobility and power have been reported to be more important than maximum strength in determining maximum club head speed (Hellstrom, 2009). Mobility, and in particular axial rotation, will provide the important distance needed to create speed. Power is important, since the downswing takes about 0.2–0.3 seconds for the average tour player, and the mass of the club is light as compared to 1 Repetition Maximum in axial rotation. Well trained top-class players with high club speed may therefore develop a slower club speed after a period of slow velocity strength training (Hellstrom, 2009). The purpose of this case study was to document the combined effect of flexibility and power training on club speed in a professional golfer.