Bilateral deficit is well documented; however, bilateral deficit is not present in all tasks and is more likely in dynamic activities than isometric activities. No definitive mechanism(s) for bilateral deficit is known but an oft cited mechanism is lower activation of fast twitch motor units. The aim of this study was to produce comparable and consistent one and two legged drop jumps to examine bilateral deficit in elite power athletes and elite endurance athletes. Seven power athletes and seven endurance athletes performed single and double leg drop jumps from a range of heights that equalized loading per leg in terms of: height dropped, energy absorbed, and momentum absorbed. Force and motion data were collected at 800 Hz. Bilateral deficit for jump height, peak concentric force, and peak concentric power were calculated. Power athletes had a significantly greater (P < .05) bilateral deficit for jump height and peak power, possibly due to power athletes having more fast twitch motor units, however, endurance athletes generally had a bilateral surfeit which could confound this inference. Results indicate that equalizing loading by impulse per leg is the most appropriate and that a consistent drop height can be obtained with a short 10 minute coaching session.
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Considerations for Single and Double Leg Drop Jumps: Bilateral Deficit, Standardizing Drop Height, and Equalizing Training Load
Matthew T.G. Pain
A Single Bout of On-Ice Training Leads to Increased Interlimb Asymmetry in Competitive Youth Hockey Athletes
Bryce D. Twible, Luca Ruggiero, Chris J. McNeil, and Brian H. Dalton
block of the season. To estimate the level of intensity (ie, training load) of the on-ice training session, each participant wore a chest-strap heart rate monitor (Polar Team Pro). Data Analysis To analyze the CMJs, unprocessed force data were exported into MATLAB (MathWorks), and individual limb data
Measures of Lower Body Strength Associated With Injuries in Australian Special Forces Selection Candidates
Tim L.A. Doyle, AuraLea C. Fain, Jodie A. Wills, Daniel Cooper, Kevin Toonen, and Benjamin Kamphius
acute ankle injuries (eg, sprained ankle). 10 – 13 Generally, stronger athletes capable of generating more power, as quantified by sprint performance, are more protected from injury and variations in training load. 14 These individuals have modifiable characteristics that may mitigate risk of
Regulating Movement Frequency and Speed: Implications for Lumbar Spine Load Management Strategies Demonstrated Using an In Vitro Porcine Model
Jackie D. Zehr, Jessa M. Buchman-Pearle, Tyson A.C. Beach, Chad E. Gooyers, and Jack P. Callaghan
higher loading rate (8.3 kN/s) and longer action duration (1 s) was relatively acute (61 cycles) (Figure 5B ). Indeed, cumulative loading magnitude remains an important element of exercise prescription and training load management practice. 2 In addition to external training dose, the repetitive
Mechanisms of Achilles Tendon Rupture in National Basketball Association Players
Adam J. Petway, Matthew J. Jordan, Scott Epsley, and Philip Anloague
10.1371/journal.pone.0132894 2. Petway AJ , Freitas TT , Calleja-Gonzalez J , Medina Leal D , Alcaraz PE . Training load and match-play demands in basketball based on competition level: a systematic review . PLoS One . 2020 ; 15 ( 3 ): e0229212 . doi:10.1371/journal.pone.0229212 10
Comparison of Frontal and Transverse Plane Kinematics Related to Knee Injury in Novice Versus Experienced Female Runners
Kathryn Harrison, Adam Sima, Ronald Zernicke, Benjamin J. Darter, Mary Shall, D.S. Blaise Williams III, and Sheryl Finucane
of training. In particular, novice runners are reported to be at higher risk of injuries to the knee compared with experienced runners. 8 , 9 Many factors likely contribute to this high rate of injury. Training errors (ie, rapid increases in training load) are thought to contribute to the risk of
