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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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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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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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Nick Dobbin, Richard Hunwicks, Ben Jones, Kevin Till, Jamie Highton, and Craig Twist

J Sports Physiol Perform . 2016 ; 11 ( 2 ): 255 – 260 . PubMed doi:10.1123/ijspp.2015-0222 10.1123/ijspp.2015-0222 26217049 15. West DJ , Owen NJ , Jones MR , et al . Relationships between force-time characteristics of the isometric midthigh pull and dynamic performance in professional

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Claire J. Brady, Andrew J. Harrison, Eamonn P. Flanagan, G. Gregory Haff, and Thomas M. Comyns

.1080/02640414.2012.720704 22938509 10.1080/02640414.2012.720704 7. West 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 ( 11 ): 3070 – 3075 . PubMed ID

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Claire J. Brady, Andrew J. Harrison, Eamonn P. Flanagan, G. Gregory Haff, and Thomas M. Comyns

pull and dynamic performance in professional rugby league players . J Strength Cond Res . 2011 ; 25 ( 11 ): 3070 – 3075 . PubMed ID: 21993026 doi:10.1519/JSC.0b013e318212dcd5 10.1519/JSC.0b013e318212dcd5 21993026 13. Beckham G , Suchomel TJ , Bailey CA , Sole CJ , Grazer JL . The

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Nicola Giovanelli, Filippo Vaccari, Mirco Floreani, Enrico Rejc, Jasmine Copetti, Marco Garra, Lea Biasutti, and Stefano Lazzer

, Behm DG , Button DC . Foam rolling for delayed-onset muscle 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 23. Aboodarda SJ , Greene RM , Philpott DT , et

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Romana Puchegger and Toni Bruce

productive conceptualization of teachers as complex systems who are self‐organizing, emerging, and unpredictable with an unknowable number of outcomes. Third, the results emphasize that identity is a dynamic performance rather than a learned and reproductive task. Thus, although it appears that many initial

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Danny Lum and Abdul Rashid Aziz

. 2005 ; 19 ( 4 ): 741 – 748 . PubMed ID: 16287343 16287343 19. Murphy AJ , Wilson GJ . Poor correlation between isometric tests and dynamic performance: relationship to muscle activation . Eur J Appl Physiol . 1996 ; 73 ( 3–4 ): 353 – 357 . doi:10.1007/BF02425498 10.1007/BF02425498 20. Murphy

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Xiang Yao, Christopher Curtis, Anthony Turner, Chris Bishop, Alex Austerberry, and Shyam Chavda

between force–time characteristics of the isometric midthigh pull and dynamic performance in professional rugby league players . J Strength Cond Res . 2011 ; 25 ( 11 ): 3070 – 3075 . PubMed ID: 21993026 21993026 10.1519/JSC.0b013e318212dcd5 39. Iacono AD , Valentin S , Sanderson M , Halperin