title: The Kinetic Specificity of Plyometric Training: Verbal Cues Revisited.
abstract: Plyometric training is a popular method utilized by strength and conditioning professionals to improve aspects of functional strength. The purpose of this study was to explore the influence of extrinsic verbal cueing on the specificity of jumping movements. Thirteen participants (age: 23.4 ± 1.9 yr, body height: 170.3 ± 15.1 cm, body mass: 70.3 ± 23.8 kg,) performed four types of jumps: a depth jump "as quickly as possible" (DJT), a depth jump "as high as possible" (DJH), a countermovement jump (CMJ), and a squat jump (SJ). Dependent measures, which included measurement of strength and power, were acquired using a force platform. From the results, differences in body-weight normalized peak force (BW) (DJH: 4.3, DJT: 5.6, CMJ: 2.5, SJ: 2.2), time in upward propulsion (s) (DJH: 0.34, DJT: 0.20, CMJ: 0.40, SJ: 0.51), and mean acceleration (m·s-2) (DJH: 26.7, DJT: 36.2, CMJ: 19.8, SJ: 17.3) were observed across all comparisons (p = 0.001 - 0.033). Differences in the body-weight normalized propulsive impulse (BW·s) (DJH: 0.55, DJT: 0.52, CMJ: 0.39, SJ: 0.39) and propulsive power (kW) (DJH: 13.7, DJT: 16.5, CMJ: 11.5, SJ: 12.1) were observed across all comparisons (p = 0.001 - 0.050) except between the CMJ and SJ (p = 0.128 - 0.929). The results highlight key kinetic differences influencing the specificity of plyometric movements and suggest that verbal cues may be used to emphasize the development of reactive strength (e.g. DJT) or high-velocity concentric power (e.g. DJH).
authors.affiliation: Biomechanics Laboratory, HPER Department, Utah State University, Logan, UT.
authors.forename: Talin
authors.initials: T
authors.lastname: Louder
authors.affiliation: Spring Creek Medical Center, Providence, UT.
authors.forename: Megan
authors.initials: M
authors.lastname: Bressel
authors.affiliation: Biomechanics Laboratory, HPER Department, Utah State University, Logan, UT.
authors.forename: Eadric
authors.initials: E
authors.lastname: Bressel
keywords: agility; biomechanics; jumping
references.citation: J Sports Med Phys Fitness. 2014 Apr;54(2):129-38
references.pmid: 24509983
references.citation: J Strength Cond Res. 2008 Sep;22(5):1677-82
references.pmid: 18714215
references.citation: Clin Biomech (Bristol, Avon). 2014 Sep;29(8):918-22
references.pmid: 25087112
references.citation: J Strength Cond Res. 2009 Mar;23(2):495-506
references.pmid: 19197203
references.citation: J Bone Joint Surg Am. 2006 Aug;88(8):1769-74
references.pmid: 16882900
references.citation: J Strength Cond Res. 2014 Apr;28(4):1096-105
references.pmid: 23838969
references.citation: J Strength Cond Res. 2011 Dec;25(12):3288-98
references.pmid: 22080319
references.citation: Res Sports Med. 2012 Jul;20(3-4):223-38
references.pmid: 22742077
references.citation: J Sports Sci. 2006 Sep;24(9):919-32
references.pmid: 16882626
references.citation: J Strength Cond Res. 2008 May;22(3):861-8
references.pmid: 18438229
references.citation: J Strength Cond Res. 2011 Jan;25(1):271-85
references.pmid: 21116195
references.citation: Am J Sports Med. 2015 Feb;43(2):482-90
references.pmid: 24569703
references.citation: Sports Med. 2014 Apr;44(4):551-62
references.pmid: 24370992
references.citation: Eur J Appl Physiol. 2011 Mar;111(3):539-48
references.pmid: 20931220
references.citation: J Strength Cond Res. 2009 Nov;23(8):2358-66
references.pmid: 19826287
references.citation: J Strength Cond Res. 2007 Aug;21(3):763-7
references.pmid: 17685678
references.citation: Comput Methods Biomech Biomed Engin. 2013;16 Suppl 1:82-3
references.pmid: 23923859
references.citation: Curr Sports Med Rep. 2011 Nov-Dec;10(6):345-51
references.pmid: 22071395
references.citation: Int J Inj Contr Saf Promot. 2013;20(3):271-81
references.pmid: 22924758
references.citation: J Strength Cond Res. 2001 Aug;15(3):315-9
references.pmid: 11710657