Relationship Between Reactive Strength Index Variants in Rugby League Players.
Journal
Journal of strength and conditioning research
ISSN: 1533-4287
Titre abrégé: J Strength Cond Res
Pays: United States
ID NLM: 9415084
Informations de publication
Date de publication:
01 Jan 2021
01 Jan 2021
Historique:
pubmed:
6
2
2018
medline:
15
4
2021
entrez:
6
2
2018
Statut:
ppublish
Résumé
McMahon, JJ, Suchomel, TJ, Lake, JP, and Comfort, P. Relationship between reactive strength index variants in rugby league players. J Strength Cond Res 35(1): 280-285, 2021-Two reactive strength index (RSI) variants exist, the RSI and RSI modified (RSImod), which are typically calculated during the drop jump (DJ) and countermovement jump (CMJ), respectively. Both RSI variants have been used to monitor athletes' ability to complete stretch-shortening cycle actions quickly, but they have never been compared. The purpose of this study was to determine whether they yield relatable information about reactive strength characteristics. Male professional rugby league players (n = 21, age = 20.8 ± 2.3 years, height = 1.82 ± 0.06 m and body mass = 94.3 ± 8.4 kg) performed 3 DJs (30 cm) and CMJs on a force plate. Reactive strength index and RSImod were subsequently calculated by dividing jump height (JH) by ground contact time (GCT) and time to take-off (TTT), respectively. All variables were highly reliable (intraclass correlation coefficient ≥0.78) with acceptable levels of variability (coefficient of variation ≤8.2%), albeit larger variability was noted for DJ variables. Moreover, there was a large relationship between RSI and RSImod (r = 0.524, p = 0.007), whereas very large relationships were noted between JHs (r = 0.762, p < 0.001) and between GCT and TTT (ρ = 0.705, p < 0.001). In addition, RSI (0.90 ± 0.22) was largely and significantly (d = 2.57, p < 0.001) greater than RSImod (0.47 ± 0.08). The DJ-derived RSI yields much larger values than the CMJ-derived RSImod and although a large relationship was noted between them, it equated to just 22% shared variance. These results suggest that the 2 RSI variants do not explain each other well, indicating that they do not assess entirely the same reactive strength qualities and should not be used interchangeably.
Identifiants
pubmed: 29401201
pii: 00124278-202101000-00040
doi: 10.1519/JSC.0000000000002462
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
280-285Informations de copyright
Copyright © 2018 National Strength and Conditioning Association.
Références
Arampatzis A, Schade F, Walsh M, Bruggemann GP. Influence of leg stiffness and its effect on myodynamic jumping performance. J Electromyogr Kinesiol 11: 355–364, 2001.
Baca A. A comparison of methods for analyzing drop jump performance. Med Sci Sport Exerc 31: 437–442, 1999.
Bailey CA, Suchomel TJ, Beckham GK, Sole CJ, Grazer JL. A comparison of baseball positional differences with reactive strength index-modified. Presented at XXXIInd International Conference of Biomechanics in Sports, Johnson City, TN, July 12–16, 2014.
Beattie K, Carson BP, Lyons M, Kenny IC. The relationship between maximal-strength and reactive-strength. Int J Sports Physiol Perform 12: 548–553, 2017.
Beckham GK, Suchomel TJ, Bailey CA, Sole CJ, Grazer JL. The relationship of the reactive strength index-modified and measures of force development in the isometric mid-thigh pull. Presented at XXXIInd International Conference of Biomechanics in Sports, Johnson City, TN, July 12–16, 2014.
Bobbert MF, Huijing PA, Van Ingen Schenau GJ. Drop jumping. I. The influence of jumping technique on the biomechanics of jumping. Med Sci Sport Exerc 19: 332–338, 1987.
Byrne DJ, Browne DT, Byrne PJ, Richardson N. The inter-day reliability of reactive strength index and optimal drop height. J Strength Cond Res 31: 721–726, 2017.
Carr C, McMahon JJ, Comfort P. Relationships between jump and sprint performance in first-class county cricketers. J Trainology 4: 1–5, 2015.
Carr C, McMahon JJ, Comfort P. Changes in strength, power and speed across a season in english county cricketers. Int J Sports Physiol Perform 12: 50–55, 2017.
Cormack SJ, Newton RU, McGuigan MR, Doyle TL. Reliability of measures obtained during single and repeated countermovement jumps. Int J Sports Physiol Perform 3: 131–144, 2008.
Cunningham D, West D, Owen N, Shearer D, Finn C, Bracken R, Crewther B, Scott P, Cook C, Kilduff L. Strength and power predictors of sprinting performance in professional rugby players. J Sports Med Phys Fitness 53: 105–111, 2013.
Ebben WP, Petushek EJ. Using the reactive strength index modified to evaluate plyometric performance. J Strength Cond Res 24: 1983–1987, 2010.
Faul F, Erdfelder E, Buchner A, Lang AL. Statistical power analyses using G*Power 3.1: Tests for correlation and regression analyses. Behav Res Methods 41: 1149–1160, 2009.
Flanagan EP, Comyns TM. The use of contact time and the reactive strength index to optimize fast stretch-shortening cycle training. Strength Cond J 30: 32–38, 2008.
Flanagan EP, Ebben WP, Jensen RL. Reliability of the reactive strength index and time to stabilization during depth jumps. J Strength Cond Res 22: 1677–1682, 2008.
Fleiss JL. Reliability of measurement. In: The Design and Analysis of Clinical Experiments. Hoboken, New Jersey: John Wiley & Sons, Inc.: 1999. pp. 1–32.
Gathercole R, Sporer B, Stellingwerff T, Sleivert G. Alternative countermovement-jump analysis to quantify acute neuromuscular fatigue. Int J Sports Physiol Perform 10: 84–92, 2015.
Available at: http://www.sportsci.org/resource/stats/effectmag.html . Accessed: January 25, 2017.
Kale M, Aşçi A, Bayrak C, Açikada C. Relationships among jumping performances and sprint parameters during maximum speed phase in sprinters. J Strength Cond Res 23: 2272–2279, 2009.
Kipp K, Kiely MT, Giordanelli MD, Malloy PJ, Geiser CF. The reactive strength index reflects vertical stiffness during drop jumps. Int J Sports Physiol Perform 13: 44–49, 2018.
Kipp K, Kiely MT, Geiser CF. Reactive strength index modified is a valid measure of explosiveness in collegiate female volleyball players. J Strength Cond Res 30: 1341–1347, 2016.
Markwick WJ, Bird SP, Tufano JJ, Seitz LB, Haff GG. The intraday reliability of the reactive strength index calculated from a drop jump in professional men's basketball. Int J Sports Physiol Perform 10: 482–488, 2015.
McGuigan MR, Doyle TLA, Newton M, Edwards DJ, Nimphius S, Newton RU. Eccentric utilization ratio: Effect of sport and phase of training. J Strength Cond Res 20: 992–995, 2006.
McLellan CP, Lovell DI, Gass GC. Performance analysis of elite rugby league match play using global positioning systems. J Strength Cond Res 25: 1703–1710, 2011.
McMahon JJ, Jones PA, Suchomel TJ, Lake J, Comfort P. Influence of Reactive Strength Index Modified on Force- and Power-Time Curves. International Journal of Sports Physiology and Performance 13: 220–227, 2018.
McMahon JJ, Murphy S, Rej SJ, Comfort P. Countermovement-jump-phase characteristics of senior and academy rugby league players. Int J Sports Physiol Perform 12: 803–811, 2017.
McMahon JJ, Rej SJ, Comfort P. Sex differences in countermovement jump phase characteristics. Sports 5: 8, 2017.
Meir R, Newton R, Curtis E, Fardell M, Butler B. Physical fitness qualities of professional rugby league football players: Determination of positional differences. J Strength Cond Res 15: 450–458, 2001.
Moir GL. Three different methods of calculating vertical jump height from force platform data in men and women. Meas Phys Educ Exerc Sci 12: 207–218, 2008.
Owen NJ, Watkins J, Kilduff LP, Bevan HR, Bennett MA. Development of a criterion method to determine peak mechanical power output in a countermovement jump. J Strength Cond Res 28: 1552–1558, 2014.
Rhea MR. Determining the magnitude of treatment effects in strength training research through the use of the effect size. J Strength Cond Res 18: 918–920, 2004.
Schmidtbleicher D. Training for power events. In: Strength and Power in Sport. Komi PV, ed. Oxford, United Kingdom: Blackwell Science, 1992. pp. 169–179.
Smirniotou A, Katsikas C, Paradisis G, Argeitaki P, Zacharogiannis E, Tziortzis S. Strength-power parameters as predictors of sprinting performance. J Sports Med Phys Fitness 48: 447–454, 2008.
Struzik A, Juras G, Pietraszewski B, Rokita A. Effect of drop jump technique on the reactive strength index. J Hum Kinet 52: 157–164, 2016.
Suchomel TJ, Bailey CA, Sole CJ, Grazer JL, Beckham GK. Using reactive strength index-modified as an explosive performance measurement tool in division I athletes. J Strength Cond Res 29: 899–904, 2015.
Suchomel TJ, Sole CJ, Bailey CA, Grazer JL, Beckham GK. A comparison of reactive strength index-modified between six U.S. collegiate athletic teams. J Strength Cond Res 19: 1310–1316, 2015.
Suchomel TJ, Sole CJ, Stone MH. Comparison of methods that assess lower-body stretch-shortening cycle utilization. J Strength Cond Res 30: 547–554, 2016.
Young W. Laboratory strength assessments of athletes. New Stud Athlet 10: 86–89, 1995.
Young WB, Pryor JF, Wilson GJ. Effect of instructions on characteristics of countermovement and drop jump performance. J Strength Cond Res 9: 232–236, 1995.