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Aboodarda, Saied J. 1; Byrne, Jeannette M. 1; Samson, Michael 1; Wilson, Barry D. 2; Mokhtar, Abdul H. 3; Behm, David G. 1
(1)School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, Canada;
(2)Center for Biomechanics, National Sports Institute, Bukit Jalil, Kuala Lumpur, Malaysia; and
(3)Sports Medicine Unit, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
Journal of Strength & Conditioning Research. 28(8):2314-2323, August 2014.
Aboodarda, SJ, Byrne, JM, Samson, M, Wilson, BD, Mokhtar, AH, and Behm, DG. Does performing drop jumps with additional eccentric loading improve jump performance? J Strength Cond Res 28(8): 2314-2323, 2014-Previous investigators have speculated that applying additional external load throughout the eccentric phase of the jumping movement could amplify the stretch-shortening cycle mechanism and modulate jumping performance and jump exercise intensity. The aims of this study, therefore, were to determine the effect of increased eccentric phase loading, as delivered using an elastic device, on drop jumps (DJs) performed from different drop heights. Of specific interest were changes in (a) the kinetics; eccentric and concentric impulse, rate of force development (RFD), concentric velocity and (b) the electromyographic (EMG) activity of leg muscles. In a randomized repeated-measure study, 15 highly resistance trained male subjects performed DJs from 3 heights (20, 35, and 50 cm) under 3 different conditions: body weight only (free DJ) and with elastic bands providing downward force equivalent to 20% (+20% DJ) and 30% (+30% DJ) of body mass. All DJs were recorded using video and force plate data that were synchronized with EMG data. Results demonstrated that using additional tensile load during the airborne and eccentric phases of the DJ could enhance eccentric impulse (p = 0.042) and RFD (p < 0.001) and resulted in small to moderate effect size (ES) increases in quadriceps intergrated EMG across the eccentric phase (0.23 > ES > 0.51). The observed greater eccentric loading, however, did not immediately alter concentric kinetics and jump height nor did it alter muscle activation levels during this phase. The findings indicated that, in addition to the conventional technique of increasing drop height, using a tensile load during the airborne and eccentric phases of the DJ could further improve eccentric loading of DJs. As it has been suggested that eccentric impulse and RFD are indicators of DJ exercise intensity, these findings suggest that the loaded DJs, using additional elastic load, may be an effective technique for improving DJ exercise intensity without acute effects on the jumping performance and neuromuscular activation level in highly trained athletes.
Copyright (C) 2014 by the National Strength & Conditioning Association.
stretch-shortening cycle; plyometrics; elastic band; ground reaction force; electromyography.
1. Aboodarda SJ, George J, Mokhtar AH, Thompson MW. Muscle strength and damage following two modes of variable resistance training. J Sports Sci Med 10: 635-642, 2011.
2. Aboodarda SJ, Yusof A, Abu Osman NA, Thompson MW, Mokhtar AH. Enhanced performance with elastic resistance during the eccentric phase of a countermovement jump. Int J Sports Physiol Perform 8: 181-187, 2013.
3. Argus CK, Gill ND, Keogh JW, Blazevich AJ, Hopkins WG. Kinetic and training comparisons between assisted, resisted, and free countermovement jumps. J Strength Cond Res 25: 2219-2227, 2011.
4. Bobbert MF, Gerritsen KM, Litjens MA, Soest AV. Why is countermovement jump height greater than squat jump height? Med Sci Sports Exerc 28: 1402-1412, 1996.
5. Bobbert MF, Huijing PA, van Ingen Schenau GJ. Drop jumping. I. The influence of jumping technique on the biomechanics of jumping. Med Sci Sports Exerc 19: 332-338, 1987.
6. Bobbert MF, Huijing PA, van Ingen Schenau GJ. Drop jumping. II. The influence of dropping height on the biomechanics of drop jumping. Med Sci Sports Exerc 19: 339-346, 1987.
7. Cohen J. Statistical Power Analysis for the Behavioral Sciences (2nd ed.) Hillsdale, NJ: Lawrence Erlbaum Associates, 1988.
8. Cormie P, McBride JM, McCaulley GO. Power-time, force-time, and velocity-time curve analysis during the jump squat: Impact of load. J Appl Biomech 24: 112-120, 2008.
9. Cronin J, McNair P, Marshall R. The effects of bungy weight training on muscle function and functional performance. J Sports Sci 21: 59-71, 2003.
10. Driss T, Vandewalle H, Quievre J, Miller C, Monod H. Effects of external loading on power output in a squat jump on a force platform: A comparison between strength and power athletes and sedentary individuals. J Sports Sci 19: 99-105, 2001.
11. Dugan EL, Doyle TL, Humphries B, Hasson CJ, Newton RU. Determining the optimal load for jump squats: A review of methods and calculations. J Strength Cond Res 18: 668-674, 2004.
12. Duncan A, McDonagh MJ. Stretch reflex distinguished from pre-programmed muscle activations following landing impacts in man. J Physiol 526(Pt. 2): 457-468, 2000.
13. Farley CT, Blickhan R, Saito J, Taylor CR. Hopping frequency in humans: A test of how springs set stride frequency in bouncing gaits. J Appl Physiol (1985) 71: 2127-2132, 1991.
14. Farley CT, Morgenroth DC. Leg stiffness primarily depends on ankle stiffness during human hopping. J Biomech 32: 267-273, 1999.
15. Fowler NE, Lees A, Reilly T. Spinal shrinkage in unloaded and loaded drop-jumping. Ergonomics 37: 133-139, 1994.
16. Gollhofer A, Schmidtblecher D. Muscle Activation Patterns of Human Leg Extensors and Force-Time Characteristics in Jumping Exercises Under Increased Stretching Loads. Amsterdam: Free University Press, 1988.
17. Hermens HJ, Freriks B, Merletti R, Hagg GG, Stegeman D, Blok J, Rau G, Disselhorst-Klug C. SENIAM 8: European Recommendations for Surface Electromyography, Deliverable of the SENIAM Project. Enschede, Netherlands: Roessingh Research and Development bv, 1999.
18. Hobara H, Kanosue K, Suzuki S. Changes in muscle activity with increase in leg stiffness during hopping. Neurosci Lett 418: 55-59, 2007.
19. Hobara H, Muraoka T, Omuro K, Gomi K, Sakamoto M, Inoue K, Kanosue K. Knee stiffness is a major determinant of leg stiffness during maximal hopping. J Biomech 42: 1768-1771, 2009.
20. Hof AL, van den Berg JW. How much energy can be stored in human muscle elasticity? Movement Sci 5: 107-114, 1986.
21. Holm S. A simple sequentially rejective multiple test procedure. Scand J Statist 6: 65-70, 1979.
22. Horita T, Komi PV, Nicol C, Kyrolainen H. Stretch shortening cycle fatigue: Interactions among joint stiffness, reflex, and muscle mechanical performance in the drop jump. Eur J Appl Physiol Occup Physiol 73: 393-403, 1996.
23. Jakobsen MD, Sundstrup E, Andersen CH, Aagaard P, Andersen LL. Muscle activity during leg strengthening exercise using free weights and elastic resistance: Effects of ballistic vs controlled contractions. Hum Mov Sci 32: 65-78, 2013.
24. Jensen RL, Ebben WP. Quantifying plyometric intensity via rate of force development, knee joint, and ground reaction forces. J Strength Cond Res 21: 763-767, 2007.
25. Kirby TJ, McBride JM, Haines TL, Dayne AM. Relative net vertical impulse determines jumping performance. J Appl Biomech 27: 207-214, 2011.
26. Komi PV. Stretch-shortening cycle. In: Strength and Power in Sport. Komi P.V., ed. Oxford: Blackwell Science, 1992. pp. 169-179.
27. Komi PV, Gollhofer A. Stretch reflexes can have an important role in force enhancement during SSC-exercise. J Appl Biomech 13: 451-460, 1997.
28. Liebermann DG, Hoffman JR. Timing of preparatory landing responses as a function of availability of optic flow information. J Electromyogr Kinesiol 15: 120-130, 2005.
29. Linthorne NP. Analysis of standing vertical jumps using a force platform. Am J Phys 69: 1198-1204, 2001.
30. Makaruk H, Sacewicz T. The effect of drop height and body mass on drop jump intensity. Biol Sport 28: 63-67, 2011.
31. Makaruk H, Sacewicz T, Czaplicki A, Sadowski J. Effect of additional load on power output during drop jump training. J Hum Kinetics 26: 31-37, 2010.
32. Moore CA, Weiss LW, Schilling BK, Fry AC, Li Y. Acute effects of augmented eccentric loading on jump squat performance. J Strength Cond Res 21: 372-377, 2007.
33. Ojasto T, Hakkinen K. Effects of different accentuated eccentric loads on acute neuromuscular, growth hormone, and blood lactate responses during a hypertrophic protocol. J Strength Cond Res 23: 946-953, 2009.
34. Page P, Ellenbecker T. The Scientific and Clinical Application of Elastic Resistance. Champaign, IL: Human Kinetics, 2003.
35. Schmidtbleicher D, Gollhofer. Neuromuscular studies for the determination of individual large loads for plyometric training. Leistungssport 12: 298-307, 1982.
36. Seegmiller JG, McCaw ST. Ground reaction forces among gymnasts and recreational athletes in drop landings. J Athl Train 38: 311-314, 2003.
37. Sheppard J, Newton R, McGuigan M. The effect of accentuated eccentric load on jump kinetics in high-performance volleyball players. Int J Sports Sci Coach 2: 267-273, 2007.
38. Simoneau GG, Bereda SM, Sobush DC, Starsky AJ. Biomechanics of elastic resistance in therapeutic exercise programs. J Orthop Sports Phys Ther 31: 16-24, 2001.
39. Tsarouchas L, Giavroglou A, Kalamaras K, Dimitrakaki K, Prassas S. The variability of vertical ground reaction forces during unloaded and loaded drop jumping. XIIth International Symposium on Biomechanics in Sports, 1994.
40. Walsh M, Arampatzis A, Schade F, Bruggemann GP. The effect of drop jump starting height and contact time on power, work performed, and moment of force. J Strength Cond Res 18: 561-566, 2004.
41. Walsh A, Wilson G. The influence of musculotendon stiffness on drop jump performance. Can J Appl Physiol 22: 117-132, 1997.
42. Walshe AD, Wilson GJ, Ettema GJ. Stretch-shorten cycle compared with isometric preload: Contributions to enhanced muscular performance. J Appl Physiol (1985) 84: 97-106, 1998.
43. Wilson G, Wood GA, Elliott BC. Optimal stiffness of series elastic component in a stretch-shorten cycle activity. J Appl Physiol (1985) 70: 825-833, 1991.
Clinical Medicine. Health Professions.
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