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Akihiro Tamura, Kiyokazu Akasaka and Takahiro Otsudo

all performed a single-leg drop vertical jump on their dominant foot and were categorized into groups by knee alignment in the frontal plane. This jump consisted of 2 stages: (1) single-leg landing after dropping from a 40-cm box and (2) single-leg landing after a maximal vertical jump. The procedure

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Mark Booth, Stephen Cobley and Rhonda Orr

performance,” OR “strength,” OR “1RM” OR “3RM,” OR “5RM,” OR “bench throw” OR “jump squat,” OR “vertical jump” OR “CMJ,” OR “jump height,” OR “sprint,” OR “running velocity,” OR “acceleration,” OR “maximal speed,” OR “change of direction,” OR “COD,” OR “agility” OR “505,” OR “injury,” OR “strain,” OR “sprain

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Michelle A. Sandrey, Yu-Jen Chang and Jean L. McCrory

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

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Jakob Tarp, Anna Bugge, Niels Christian Møller, Heidi Klakk, Christina Trifonov Rexen, Anders Grøntved and Niels Wedderkopp

attempts on an analogue handgrip dynamometer (Smedley’s dynamometer; Scandidact, Odder, Denmark) while standing. The dynamometer was adjusted to hand size. The result was divided by body weight for analysis. 20 Muscular power was measured by a vertical jump test as the highest vertical displacement (in

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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

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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

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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

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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

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James A. Yaggie and Stephen J. Kinzey

Context:

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).

Objective:

To examine the influence of ankle bracing on ROM and sport-related performance.

Design:

Repeated measures.

Setting:

Biomechanics laboratory.

Participants:

30 volunteers. None reported ankle trauma within 2 years preceding the study or had other orthopedic conditions that would have affected physical performance.

Intervention:

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.

Results:

Both braces restricted plantar flexion and inversion ROM and caused no change in shuttle-run time or vertical jump height.

Conclusions:

Our results indicate that bracing the ankle joint increases external lateral support to the joint without significantly restricting functional ability.

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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.