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Single-Leg Power Output and Between-Limbs Imbalances in Team-Sport Players: Unilateral Versus Bilateral Combined Resistance Training

Oliver Gonzalo-Skok, Julio Tous-Fajardo, Luis Suarez-Arrones, José Luis Arjol-Serrano, José Antonio Casajús, and Alberto Mendez-Villanueva

Purpose:

To compare the effects of unilateral and bilateral resistance training on single-leg power output, between-limbs imbalance (BLI), bilateral deficit (BLD), change of direction (COD), and linear sprinting and jumping performance in young elite basketball players.

Methods:

Twenty-two young (U-16–U-19) male basketball players were randomly assigned either to an exclusive unilateral (UNI) (n = 11) or a bilateral (BIL) (n = 11) resistance-training group during a 6-wk period. Both groups training consisted of 3 unilateral or bilateral 90° back-squat sets. A postdetermined number of repetitions was set until power output dropped to <10% of maximum power (MP) output. In addition, both groups performed 2 sets of 5 unilateral or bilateral drop jumps and 2 sets of 5 unilateral or bilateral countermovement jumps (CMJ). Pre- and posttraining, performance was assessed by an incremental bilateral and unilateral squat-load test, a multiple-COD test (V-cut test), a 15-m-sprint test (7.5 + 7.5 m) with one 180° COD performed with both right (180° RCOD) and left (180° LCOD) legs, a 25-m-sprint test (5- and 15-m split time), and a CMJ test.

Results:

Within-group analyses showed substantial improvements in 180° RCOD, bilateral and unilateral MP, 25-m-sprint test, and CMJ in both groups. Between-groups analyses showed substantially better results in 180° LCOD, MP with right and left legs, BLI, and BLD in UNI than in BIL.

Conclusions:

Both training programs substantially improved most of the physical-fitness tests, but only UNI reduced between-limbs asymmetry and achieved greater enhancements in actions that mostly required applying force unilaterally in basketball players.

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Does a Loaded Warm-Up Influence Jump Asymmetry and Badminton-Specific Change of Direction Performance?

Wing-Chun V. Yeung, Chris Bishop, Anthony N. Turner, and Sean J. Maloney

Specifically, asymmetries in single-leg countermovement jump (SLCMJ) height have been correlated with impaired CODS in youth tennis players, 17 and academy soccer players, 18 but not in youth handball players, 19 , 20 female soccer players, 21 or in a mixed cohort of professional soccer and cricket players

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The Relationship of Open- and Closed-Kinetic-Chain Rate of Force Development With Jump Performance Following Anterior Cruciate Ligament Reconstruction

Megan C. Graham, Kelsey A. Reeves, Tereza Janatova, and Brian Noehren

-limb differences in RFD measured during isometric knee extension (OKC) and unilateral IMTP (CKC) testing in individuals 1 to 5 years after ACLR. Furthermore, this study aimed to establish which method had the strongest relationship to single-leg vertical jump performance and knee joint mechanics. We hypothesized

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Effect of Biological Maturation on Performance of the Athletic Ability Assessment in Australian Rules Football Players

Daniel K. Rogers, Ian McKeown, Gaynor Parfitt, Darren Burgess, and Roger G. Eston

(assessing the ability to flex and extend at the hips, knees, and ankles, while maintaining a neutral trunk position and extension through the thoracic spine); double lunge (assessing the ability to decelerate on one leg while maintaining a neutral trunk position); single-leg Romanian dead lift (RDL

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Examining the Talent Selection Determinants of Ultimate Frisbee Players Selected Into a National Youth Team

Jonathan D. Connor, Daniel Berkelmans, and Kenji Doma

conducted at the onset of the camp and was the first major activity completed. The test battery protocol included standing height, body mass, 30-m sprint test, single-leg vertical jump (performed on both left and right foot for take-off), bilateral jump, and an Illinois agility test. Players undertook a

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Train the Engine or the Brakes? Influence of Momentum on the Change of Direction Deficit

Rebecca Fernandes, Chris Bishop, Anthony N. Turner, Shyam Chavda, and Sean J. Maloney

, separated by 1 h, the soccer players performed single-leg countermovement (SLCMJ) and drop jump (SLDJ) tests followed by a 40-m sprint and CODS test ( t test). In the first session, the players completed anthropometric assessments and both jump tests. Following a lunch break, the players performed the

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Vertical and Horizontal Jump Capacity in International Cerebral Palsy Football Players

Raúl Reina, Aitor Iturricastillo, Rafael Sabido, Maria Campayo-Piernas, and Javier Yanci

players without brain impairments. Nevertheless, other studies about reliability in 1-leg jump tasks have shown lower values, 32 where football players performed single-leg CMJ with ICC and CV of .37 to .64 and 10.1% to 39.2%, respectively. The reliability obtained in the TH tests in this study was

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The Influence of Match-Day Napping in Elite Female Netball Athletes

Shannon O’Donnell, Christopher M. Beaven, and Matthew Driller

Single-leg squat drop 5 each side 60  Double-leg pogo 10 60  Double-leg squat drop–tap–jump 5 60  Single-leg squat drop–tap–jump 5 60  Banded countermovement jumps 5 60 Performance Measures Thirty minutes following the allocated downtime period (and after the primer exercises), athletes were required to

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Reliability, Validity, and Sensitivity of a Novel Smartphone-Based Eccentric Hamstring Strength Test in Professional Football Players

Justin W.Y. Lee, Ming-Jing Cai, Patrick S.H. Yung, and Kai-Ming Chan

be determined. 5 , 11 , 12 For instance, the hamstring strength measurement from a single leg bridge test is varied because of the large posture variation on the support leg. 5 In light of these challenges, a previous study adopted the Nordic hamstring exercise as a field-based assessment of

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Training-Related Changes in Force–Power Profiles: Implications for the Skeleton Start

Steffi L. Colyer, Keith A. Stokes, James L.J. Bilzon, Danny Holdcroft, and Aki I.T. Salo

Training Blocks With Specific Training Emphasis Training emphasis Session Exercises Load Repetition scheme Weekly frequency Maximal strength development Strength Dead lift (variations) 80%–98% (of 2RM) 6 × 2–5 3 Leg press Hack squat Supplementary strength Squat jumps 50% BW 10 × 30 s 1–2 Single leg squats