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Paul Comfort, Thomas Dos’Santos, Paul A. Jones, John J. McMahon, Timothy J. Suchomel, Caleb Bazyler and Michael H. Stone

dynamic and isometric muscle actions of elite women Olympic weightlifters . J Strength Cond Res . 2005 ; 19 : 741 – 748 . PubMed ID: 16287343 16287343 11. Kraska JM , Ramsey MW , Haff GG , et al . Relationship between strength characteristics and unweighted and weighted vertical jump height

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Tom Clifford, Will Abbott, Susan Y. Kwiecien, Glyn Howatson and Malachy P. McHugh

system (Bolzano, Italy). Participants started the movement upright with hands fixed to their hips and after a verbal cue, descended into a squat prior to performing a maximal effort vertical jump. Participants performed 3 maximal efforts, separated by approximately 60 seconds of standing recovery; the

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Hermann Zbinden-Foncea, Isabel Rada, Jesus Gomez, Marco Kokaly, Trent Stellingwerff, Louise Deldicque and Luis Peñailillo

, Sekulic D , Hadzic V , Uljevic O , Dervisevic E . Vertical jumping tests in volleyball: reliability, validity, and playing-position specifics . J Strength Cond Res . 2012 ; 26 ( 6 ): 1532 – 1538 . PubMed doi:10.1519/JSC.0b013e318234e838 21904238 10.1519/JSC.0b013e318234e838 16. Del Coso J

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Alexander T. Latinjak, Marc Masó and Nikos Comoutos

instructional self talk on improving motor performance . The Sport Psychologist, 14 , 253 – 271 . doi:10.1123/tsp.14.3.253 10.1123/tsp.14.3.253 Tod , D.A. , Thatcher , R. , McGuigan , M. , & Thatcher , J. ( 2009 ). Effects of instructional and motivational self-talk on the vertical jump . The

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

. PubMed doi:10.1519/JSC.0000000000001830 10.1519/JSC.0000000000001830 22. Thomas C , Jones PA , Rothwell J , Chiang CY , Comfort P . An investigation into the relationship between maximum isometric strength and vertical jump performance . J Strength Cond Res . 2015 ; 29 ( 8 ): 2176 – 2185

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Johan Cassirame, Hervé Sanchez and Jean-Benoit Morin

JF , Gouge S , Nussbaumer S , Stauffacher S , Impellizzeri FM , Maffiuletti NA . Validity and reliability of Optojump photoelectric cells for estimating vertical jump height . J Strength Cond Res . 2011 ; 25 ( 2 ): 556 – 560 . doi:10.1519/JSC.0b013e3181ccb18d 20647944 10.1519/JSC.0b

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Kelly Pritchett, Robert C. Pritchett, Lauren Stark, Elizabeth Broad and Melissa LaCroix

trials have reported improved performance measures (isometric strength, vertical jump, and 10-m sprint time) following supplementation dosages of 2,000–5,000 IU/day of vitamin D 3 over 8 weeks to 4 months during the winter season ( Close et al., 2013 ; Wyon et al., 2014 ). Similarly, Ward et al. ( 2009

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Kristof Kipp, Michael T. Kiely, Matthew D. Giordanelli, Philip J. Malloy and Christopher F. Geiser

in maximal vertical jumping after different prestretch loads . J Biomech . 1995 ; 28 ( 3 ): 293 – 307 . PubMed doi:10.1016/0021-9290(94)00062-9 10.1016/0021-9290(94)00062-9 7730388 11. Brughelli M , Cronin J . A review of research on the mechanical stiffness in running and jumping

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Aitor Iturricastillo, Cristina Granados, Raúl Reina, José Manuel Sarabia, Ander Romarate and Javier Yanci

.1519/JSC.0000000000000799 34. Sassi RH , Dardouri W , Yahmed MH , Gmada N , Mahfoudhi ME , Gharbi Z . Relative and absolute reliability of a modified agility T-test and its relationship with vertical jump and straight sprint . J Strength Cond Res . 2009 ; 23 ( 6 ): 1644 – 1651 . doi:10

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Samuel T. Orange, James W. Metcalfe, Ashley Robinson, Mark J. Applegarth and Andreas Liefeith

Optojump photoelectric cells for estimating vertical jump height . J Strength Cond Res . 2011 ; 25 ( 2 ): 556 – 560 . PubMed ID: 20647944 doi:10.1519/JSC.0b013e3181ccb18d. 20647944 10.1519/JSC.0b013e3181ccb18d 17. Robertson RJ , Goss FL , Rutkowski J , et al . Concurrent validation of the OMNI