activated during a jumping task. Repetitive impacts from vertical jump landings in jumping sport athletes have been associated with injury, as the musculoskeletal system must attenuate the mechanical shock during contact. 7 , 8 Elevated peak tibial accelerations (TAs) values might, therefore, indicate an
Michelle A. Sandrey, Yu-Jen Chang and Jean L. McCrory
Jorge Carlos-Vivas, Jorge Perez-Gomez, Ola Eriksrud, Tomás T. Freitas, Elena Marín-Cascales and Pedro E. Alcaraz
after 8 weeks of linear and COD sprint training. The authors hypothesized that (1) all RST groups will experience improvements in sprint and COD performance, and they will also likely obtain enhancements in horizontal and vertical jump performance, and (2) the groups that performed RST with horizontally
Michele Merlini, Greg Whyte, Sam Marcora, Mike Loosemore, Neil Chester and John Dickinson
, peak concentric strength of the knee extensors and flexors, maximal 1 repetition of bench and leg press, vertical jump, and skinfold thickness. Participants were randomly allocated to 1 of 3 treatments to be inhaled twice daily: placebo (PLA) inhaler, 100-µg inhaled SAL, or 12-µg inhaled FOR. Over the
Simon Gavanda, Stephan Geisler, Oliver Jan Quittmann and Thorsten Schiffer
In American football (AF), body size, strength, and power are important factors for performance. 1 Previous studies indicated that 1-repetition maximum (1RM), sprint performance, and vertical jumping ability are important predictors for success in AF. 2 Starters are stronger, more powerful, and
Melissa DiFabio, Lindsay V. Slater, Grant Norte, John Goetschius, Joseph M. Hart and Jay Hertel
a maximal vertical jump. Three successive trials were performed, recorded with video cameras set up in the frontal and sagittal planes as previously described. 27 Before the assessment, participants were instructed to practice until both the participant and clinician were comfortable with the test
James A. Yaggie and Stephen J. Kinzey
Ankle bracing has been used for many years in an attempt to prevent lateral ligamentous injuries of the ankle by restricting joint range of motion (ROM).
To examine the influence of ankle bracing on ROM and sport-related performance.
30 volunteers. None reported ankle trauma within 2 years preceding the study or had other orthopedic conditions that would have affected physical performance.
Three brace conditions (McDavid A101™, Perform-8™ Lateral Stabilizer) were assessed during performance of the vertical jump and shuttle run.
Main Outcome Measures:
shuttle-run time, vertical jump height, inversion, and plantar flexion ROM.
Both braces restricted plantar flexion and inversion ROM and caused no change in shuttle-run time or vertical jump height.
Our results indicate that bracing the ankle joint increases external lateral support to the joint without significantly restricting functional ability.
James L. Nuzzo, Michael J. Cavill, N. Travis Triplett and Jeffrey M. McBride
The primary purpose of this investigation was to provide a descriptive analysis of lower-body strength and vertical jump performance in overweight male (n = 8) and female (n = 13) adolescents. Maximal strength was tested in the leg press and isometric squat. Kinetic and kinematic variables were assessed in vertical jumps at various loads. When compared with females, males demonstrated significantly greater (p ≤ .05) absolute maximal strength in the leg press. However, when maximal strength was expressed relative to body mass, no significant difference was observed. There were no significant differences between males and females in vertical jump performance at body mass.
Borja Muniz-Pardos, Alejandro Gómez-Bruton, Ángel Matute-Llorente, Alex González-Agüero, Alba Gómez-Cabello, José A. Casajús and Germán Vicente-Rodríguez
were performed, with the best performance recorded for further analyses. Finally, participants completed the CMJ test on a portable force platform (Kistler Type 9260AA; Kistler Instruments Ltd). Participants stood with both hands on their hips to isolate the lower-limb action and performed a vertical
Martin Buchheit, Mathieu Lacome, Yannick Cholley and Ben Michael Simpson
replicated over the 2 weeks, with strength (Tuesday) and speed (Thursday) sessions monitored in the first week, and endurance (Wednesday) in the second week. Neuromuscular Performance Assessment Generic Testing Before and after each session, vertical jump performance (CMJ height, Optojump Next; Microgate
Sean J. Maloney, Anthony N. Turner and Stuart Miller
It has previously been shown that a loaded warm-up may improve power performances. We examined the acute effects of loaded dynamic warm-up on change of direction speed (CODS), which had not been previously investigated. Eight elite badminton players participated in three sessions during which they performed vertical countermovement jump and CODS tests before and after undertaking the dynamic warm-up. The three warm-up conditions involved wearing a weighted vest (a) equivalent to 5% body mass, (b) equivalent to 10% body mass, and (c) a control where a weighted vest was not worn. Vertical jump and CODS performances were then tested at 15 seconds and 2, 4, and 6 minutes post warm-up. Vertical jump and CODS significantly improved following all warm-up conditions (P < .05). Post warm-up vertical jump performance was not different between conditions (P = .430). Post warm-up CODS was significantly faster following the 5% (P = .02) and 10% (P < .001) loaded conditions compared with the control condition. In addition, peak CODS test performances, independent of recovery time, were faster than the control condition following the 10% loaded condition (P = .012). In conclusion, the current study demonstrates that a loaded warm-up augmented CODS, but not vertical jump performance, in elite badminton players.