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Christopher Thomas, Paul Comfort, Paul A. Jones and Thomas Dos’Santos

Purpose:

To investigate the relationships between maximal isometric strength, vertical jump (VJ), sprint speed, and change-of-direction speed (CoDS) in academy netball players and determine whether players who have high performance in isometric strength testing would demonstrate superior performance in VJ, sprint speed, and CoDS measures.

Method:

Twenty-six young female netball players (age 16.1 ± 1.2 y, height 173.9 ± 5.7 cm, body mass 66.0 ± 7.2 kg) from a regional netball academy performed isometric midthigh pull (IMTP), squat jumps (SJs), countermovement jumps (CMJs), 10-m sprints, and CoDS (505).

Results:

IMTP measures displayed moderate to strong correlations with sprint and CoDS performance (r = –.41 to –.66). The VJs, which included SJs and CMJs, demonstrated strong correlations with 10-m sprint times (r = –.60 to –.65; P < .01) and CoDS (r = –.60 to –.71; P = .01). Stronger players displayed significantly faster sprint (ES = 1.1–1.2) and CoDS times (ES = 1.2–1.7) and greater VJ height (ES = 0.9–1.0) than weaker players.

Conclusion:

The results of this study illustrate the importance of developing high levels of lower-body strength to enhance VJ, sprint, and CoDS performance in youth netball players, with stronger athletes demonstrating superior VJ, sprint, and CoDS performances.

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Leonardo Shigaki, Cynthia Gobbi Alves Araújo, Mariane Guizeline Calderon, Thais Karoline Cezar Costa, Andreo Fernando Aguiar, Leonardo Oliveira Pena Costa and Rubens A. da Silva

back mechanical endurance gains during dynamic performance after training. These results are further illustrated in Figure  3C . Discussion This study compared the effects of 2 volumes of training on strength and endurance variables of back-extensor muscles during a 10-week specific training program in

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Aron J. Murphy, Greg J. Wilson, John F. Pryor and Robert U. Newton

The purpose of this investigation was to determine the relationship between isometric measures of muscular function at two different joint angles and dynamic performance. Thirteen experienced weight trainers performed two isometric tests in a bench press position, at elbow angles of 90 and 120°. Performance was assessed by a one repetition maximum (1-RM) bench press and a series of upper body bench press throws at loads of 15, 30, and 60% of the 1-RM load. The results clearly show that changing the joint angle from 120 to 90° improved the relationship between most of the tests and performance by more than 100%, possibly due to differences in motor unit recruitment patterns and differing muscle mechanics (e.g., length-tension), at varying joint angles. It was suggested that the best angle at which to assess isometric function may be the joint angle at which peak force is developed in the performance of interest.

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Michael H. Stone, William A. Sands, Kyle C. Pierce, Michael W. Ramsey and G. Gregory Haff

Purpose:

To assess the effects of manipulating the loading of successive sets of midthigh clean pulls on the potentiation capabilities of 7 international-level US weightlifters (4 men, 3 women).

Methods:

Isometric and dynamic peak-force characteristics were measured with a force plate at 500 Hz. Velocity during dynamic pulls was measured using 2 potentiometers that were suspended from the top of the right and left sides of the testing system and attached to both ends of the bar. Five dynamic-performance trials were used (in the following order) as the potentiation protocol: women at 60, 80, 100, 120, and 80 kg and men at 60, 140, 180, 220, and 140 kg. Trials 2 vs 5 were specifically analyzed to assess potentiation capabilities. Isometric midthigh pulls were assessed for peak force and rate of force development. Dynamic lifts were assessed for peak force (PF), peak velocity (PV), peak power (PP), and rate of force development (RFD).

Results:

Although all values (PF, PV, PP, and RFD) were higher postpotentiation, the only statistically higher value was found for PV (ICCα = .95, P = .011, η2 = .69).

Conclusions:

Results suggest that manipulating set-loading configuration can result in a potentiation effect when heavily loaded sets are followed by a lighter set. This potentiation effect was primarily characterized by an increase in the PV in elite weightlifters.

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Ty B. Palmer, Jose G. Pineda and Rachel M. Durham

muscular strength with dynamic performances. 36 , 37 Therefore, given the fact that the quarter squat elicited higher maximal and late rapid strength characteristics than the parallel and half squats and because most lower-body, sport-specific tasks (ie, sprinting, walking, regaining balance to avoid a

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Paige E. Rice, Herman van Werkhoven, Edward K. Merritt and Jeffrey M. McBride

leg can be easily identified. The purpose of this study was to determine if the morphological characteristics of the lower leg and dynamic performance measurements were greater in female dancers than untrained controls as a possible result from previous involvement in dance. To achieve this, relative

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Thomas Dos’Santos, Paul A. Jones, Jonathan Kelly, John J. McMahon, Paul Comfort and Christopher Thomas

midthigh pull: test-retest reliability . Int J Sports Physiol Perform . 2015 ; 10 ( 1 ): 58 – 63 . PubMed ID: 24912198 doi:10.1123/ijspp.2014-0077 10.1123/ijspp.2014-0077 24912198 17. Juneja H , Verma SK , Khanna GL . Isometric strength and its relationship to dynamic performance: a systematic

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Scott W. Cheatham and Morey J. Kolber

GE , Bradbury-Squires DJ , Kawamoto JE , Drinkwater EJ , Behm DG , Button DC . Foam rolling for delayed-onset muscle soreness and recovery of dynamic performance measures . J Athl Train . 2015 ; 50 ( 1 ): 5 – 13 . PubMed doi:10.4085/1062-6050-50.1.01 10

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Jan Wilke, Philipp Niemeyer, Daniel Niederer, Robert Schleip and Winfried Banzer

soreness and recovery of dynamic performance measures . J Athl Train . 2015 ; 50 : 5 – 13 . PubMed ID: 25415413 doi:10.4085/1062-6050-50.1.01 10.4085/1062-6050-50.1.01 25415413 12. Couture G , Karlik D , Glass SC , Hatzel BM . The effect of foam rolling duration on hamstring range of motion

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Jorg Teichmann, Edin K. Suwarganda, C. Martyn Beaven, Kim Hébert-Losier, Jin Wei Lee, Florencio Tenllado Vallejo, Philip Chun Foong Lew, Ramlan Abdul Aziz, Yeo Wee Kian and Dietmar Schmidtbleicher

DJ , Owen NJ , Jones MR , et al . Relationships between force-time characteristics of the isometric midthigh pull and dynamic performance in professional rugby league players . J Strength Cond Res . 2011 ; 25 : 3070 – 3075 . PubMed doi:10.1519/JSC.0b013e318212dcd5 10.1519/JSC.0b013e318212