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The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent

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The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent. / Dallas, George C.; Pappas, Panagiotis; Ntallas, Constantinos G.; Paradisis, Giorgos P.; Exell, Timothy A.

In: Journal of Sports Medicine and Physical Fitness, Vol. 60, No. 7, 01.06.2020, p. 979-984.

Research output: Contribution to journalArticlepeer-review

Harvard

Dallas, GC, Pappas, P, Ntallas, CG, Paradisis, GP & Exell, TA 2020, 'The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent', Journal of Sports Medicine and Physical Fitness, vol. 60, no. 7, pp. 979-984. https://doi.org/10.23736/S0022-4707.20.10384-0

APA

Dallas, G. C., Pappas, P., Ntallas, C. G., Paradisis, G. P., & Exell, T. A. (2020). The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent. Journal of Sports Medicine and Physical Fitness, 60(7), 979-984. https://doi.org/10.23736/S0022-4707.20.10384-0

Vancouver

Dallas GC, Pappas P, Ntallas CG, Paradisis GP, Exell TA. The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent. Journal of Sports Medicine and Physical Fitness. 2020 Jun 1;60(7):979-984. https://doi.org/10.23736/S0022-4707.20.10384-0

Author

Dallas, George C. ; Pappas, Panagiotis ; Ntallas, Constantinos G. ; Paradisis, Giorgos P. ; Exell, Timothy A. / The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent. In: Journal of Sports Medicine and Physical Fitness. 2020 ; Vol. 60, No. 7. pp. 979-984.

Bibtex

@article{19cd1b056d6744dd965dd46ca03a2833,
title = "The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent",
abstract = "Background: Plyometric exercises are often used to develop lower limb strength and performance-related biomechanics such as leg stiffness. However, the effectiveness of plyometric training may depend on participants' own training and performance demands. The purpose of this study was to examine the effect of plyometric training on Reactive Strength Index (RSI) and leg stiffness (Kleg) on young athletes of different sports. Methods: Forty eight female athletes (25 Taekwondo (TKD) and 23 rhythmic gymnastics (RG), mean±SD: age: 8.94±2.50 years; mass: 29.73±7.69 kg; height: 138.84±11.90 cm; training experience: 4.62±2.37 years) participated in this study. Participants were randomly assigned to experimental (PT, N.=24) and control (CG, N.=24) groups. The PT group followed a twice-weekly plyometric training program for 4 weeks. Plyometric drills lasted approximately 5-10 s, and at least 90 s rest was allowed after each set. To examine RSI, participants performed trials of five maximal CMJs. Submaximal hopping (20 hops) was performed in order to examine leg stiffness. Results: Significant interaction effect was found for RSI and the post hoc analysis showed that RSI significantly increased by 35% (P=0.017) in RG athletes, whereas a significantly reduction by 28% (P=0.004) was revealed in TKD athletes. The interaction effect between time and group was statistically significant for Kleg (P<0.05) with Kleg significantly increasing by 31% (P=0.008) in TKD athletes, but remaining unchanged (P>0.05) in RG athletes. Conclusions: The results showed that the effect of a 4-week plyometric training program on RSI and leg stiffness is sport dependent. Further, the applied plyometric program was effective in reducing ground contact time and therefore increasing leg stiffness.",
author = "Dallas, {George C.} and Panagiotis Pappas and Ntallas, {Constantinos G.} and Paradisis, {Giorgos P.} and Exell, {Timothy A.}",
year = "2020",
month = jun,
day = "1",
doi = "10.23736/S0022-4707.20.10384-0",
language = "English",
volume = "60",
pages = "979--984",
journal = "Journal of Sports Medicine and Physical Fitness",
issn = "0022-4707",
publisher = "Edizioni Minerva Medica S.p.A.",
number = "7",

}

RIS

TY - JOUR

T1 - The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent

AU - Dallas, George C.

AU - Pappas, Panagiotis

AU - Ntallas, Constantinos G.

AU - Paradisis, Giorgos P.

AU - Exell, Timothy A.

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Background: Plyometric exercises are often used to develop lower limb strength and performance-related biomechanics such as leg stiffness. However, the effectiveness of plyometric training may depend on participants' own training and performance demands. The purpose of this study was to examine the effect of plyometric training on Reactive Strength Index (RSI) and leg stiffness (Kleg) on young athletes of different sports. Methods: Forty eight female athletes (25 Taekwondo (TKD) and 23 rhythmic gymnastics (RG), mean±SD: age: 8.94±2.50 years; mass: 29.73±7.69 kg; height: 138.84±11.90 cm; training experience: 4.62±2.37 years) participated in this study. Participants were randomly assigned to experimental (PT, N.=24) and control (CG, N.=24) groups. The PT group followed a twice-weekly plyometric training program for 4 weeks. Plyometric drills lasted approximately 5-10 s, and at least 90 s rest was allowed after each set. To examine RSI, participants performed trials of five maximal CMJs. Submaximal hopping (20 hops) was performed in order to examine leg stiffness. Results: Significant interaction effect was found for RSI and the post hoc analysis showed that RSI significantly increased by 35% (P=0.017) in RG athletes, whereas a significantly reduction by 28% (P=0.004) was revealed in TKD athletes. The interaction effect between time and group was statistically significant for Kleg (P<0.05) with Kleg significantly increasing by 31% (P=0.008) in TKD athletes, but remaining unchanged (P>0.05) in RG athletes. Conclusions: The results showed that the effect of a 4-week plyometric training program on RSI and leg stiffness is sport dependent. Further, the applied plyometric program was effective in reducing ground contact time and therefore increasing leg stiffness.

AB - Background: Plyometric exercises are often used to develop lower limb strength and performance-related biomechanics such as leg stiffness. However, the effectiveness of plyometric training may depend on participants' own training and performance demands. The purpose of this study was to examine the effect of plyometric training on Reactive Strength Index (RSI) and leg stiffness (Kleg) on young athletes of different sports. Methods: Forty eight female athletes (25 Taekwondo (TKD) and 23 rhythmic gymnastics (RG), mean±SD: age: 8.94±2.50 years; mass: 29.73±7.69 kg; height: 138.84±11.90 cm; training experience: 4.62±2.37 years) participated in this study. Participants were randomly assigned to experimental (PT, N.=24) and control (CG, N.=24) groups. The PT group followed a twice-weekly plyometric training program for 4 weeks. Plyometric drills lasted approximately 5-10 s, and at least 90 s rest was allowed after each set. To examine RSI, participants performed trials of five maximal CMJs. Submaximal hopping (20 hops) was performed in order to examine leg stiffness. Results: Significant interaction effect was found for RSI and the post hoc analysis showed that RSI significantly increased by 35% (P=0.017) in RG athletes, whereas a significantly reduction by 28% (P=0.004) was revealed in TKD athletes. The interaction effect between time and group was statistically significant for Kleg (P<0.05) with Kleg significantly increasing by 31% (P=0.008) in TKD athletes, but remaining unchanged (P>0.05) in RG athletes. Conclusions: The results showed that the effect of a 4-week plyometric training program on RSI and leg stiffness is sport dependent. Further, the applied plyometric program was effective in reducing ground contact time and therefore increasing leg stiffness.

UR - https://www.minervamedica.it/en/journals/article-sharing.php

U2 - 10.23736/S0022-4707.20.10384-0

DO - 10.23736/S0022-4707.20.10384-0

M3 - Article

VL - 60

SP - 979

EP - 984

JO - Journal of Sports Medicine and Physical Fitness

JF - Journal of Sports Medicine and Physical Fitness

SN - 0022-4707

IS - 7

ER -

ID: 21751506