Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players

Rodrigo Ramírez-Campillo, Cristian Álvarez, Paulo Gentil, Jason Moran, Felipe García Pinillos, Alicia M. Alonso-Martínez, Mikel Izquierdo

Research output: Contribution to journalJournal Article

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Abstract

The purpose of this study was to compare the inter-individual variability in the effects of plyometric jump training (PJT) on measures of physical fitness (sprint time; change of direction speed; countermovement jump; 20- and 40-cm drop jump reactive strength index; multiple 5 bounds distance; maximal kicking distance; and 2.4-km time trial) in youth soccer players who completed a PJT programme versus players who completed soccer training only. In a single-blinded study, participants aged between 10 and 16 years were randomly divided into a PJT group (n=38) and a control group (n=38). The experimental group participated in a PJT programme twice weekly for 7 weeks, whereas the control group continued with their regular soccer training sessions. Between-group differences were examined using a Mann-Whitney U test. Non-responders (NR) where defined as individuals who failed to demonstrate any beneficial change that was greater than two times the typical error of measurement (TE) from zero. The results indicated that the mean group improvement for all physical fitness measures was greater (p<0.05) in the PJT group (∆ = 0.4% to 23.3%; ES = 0.04 to 0.58) than in the control group (∆ = 0.1% to 3.8%; ES = 0.02 to 0.35). In addition, a significantly greater (p<0.05) number of responders across all dependent variables was observed in the PJT group (from 4 up to 33 responders) than in the control group (from 0 up to 9 responders). In conclusion, compared to soccer training only, PJT induced greater physical fitness improvements in youth soccer players, with a greater number of responders for all the physical fitness tests related to jumping, speed, change of direction speed, endurance, and kicking technical ability.
Original languageEnglish
JournalFrontiers in Physiology
DOIs
Publication statusPublished - 20 Aug 2018

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Plyometric Exercise
Soccer
Physical Fitness
Control Groups
Education
Nonparametric Statistics

Keywords

  • Football
  • Force-velocity curve
  • Jump training
  • Maturation
  • Strength
  • Stretch-shortening cycle

Cite this

Ramírez-Campillo, R., Álvarez, C., Gentil, P., Moran, J., García Pinillos, F., Alonso-Martínez, A. M., & Izquierdo, M. (2018). Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players. Frontiers in Physiology. https://doi.org/10.3389/fphys.2018.01156
Ramírez-Campillo, Rodrigo ; Álvarez, Cristian ; Gentil, Paulo ; Moran, Jason ; García Pinillos, Felipe ; Alonso-Martínez, Alicia M. ; Izquierdo, Mikel. / Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players. In: Frontiers in Physiology. 2018.
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abstract = "The purpose of this study was to compare the inter-individual variability in the effects of plyometric jump training (PJT) on measures of physical fitness (sprint time; change of direction speed; countermovement jump; 20- and 40-cm drop jump reactive strength index; multiple 5 bounds distance; maximal kicking distance; and 2.4-km time trial) in youth soccer players who completed a PJT programme versus players who completed soccer training only. In a single-blinded study, participants aged between 10 and 16 years were randomly divided into a PJT group (n=38) and a control group (n=38). The experimental group participated in a PJT programme twice weekly for 7 weeks, whereas the control group continued with their regular soccer training sessions. Between-group differences were examined using a Mann-Whitney U test. Non-responders (NR) where defined as individuals who failed to demonstrate any beneficial change that was greater than two times the typical error of measurement (TE) from zero. The results indicated that the mean group improvement for all physical fitness measures was greater (p<0.05) in the PJT group (∆ = 0.4{\%} to 23.3{\%}; ES = 0.04 to 0.58) than in the control group (∆ = 0.1{\%} to 3.8{\%}; ES = 0.02 to 0.35). In addition, a significantly greater (p<0.05) number of responders across all dependent variables was observed in the PJT group (from 4 up to 33 responders) than in the control group (from 0 up to 9 responders). In conclusion, compared to soccer training only, PJT induced greater physical fitness improvements in youth soccer players, with a greater number of responders for all the physical fitness tests related to jumping, speed, change of direction speed, endurance, and kicking technical ability.",
keywords = "Football, Force-velocity curve, Jump training, Maturation, Strength, Stretch-shortening cycle",
author = "Rodrigo Ram{\'i}rez-Campillo and Cristian {\'A}lvarez and Paulo Gentil and Jason Moran and {Garc{\'i}a Pinillos}, Felipe and Alonso-Mart{\'i}nez, {Alicia M.} and Mikel Izquierdo",
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Ramírez-Campillo, R, Álvarez, C, Gentil, P, Moran, J, García Pinillos, F, Alonso-Martínez, AM & Izquierdo, M 2018, 'Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players', Frontiers in Physiology. https://doi.org/10.3389/fphys.2018.01156

Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players. / Ramírez-Campillo, Rodrigo; Álvarez, Cristian; Gentil, Paulo; Moran, Jason; García Pinillos, Felipe; Alonso-Martínez, Alicia M.; Izquierdo, Mikel.

In: Frontiers in Physiology, 20.08.2018.

Research output: Contribution to journalJournal Article

TY - JOUR

T1 - Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players

AU - Ramírez-Campillo, Rodrigo

AU - Álvarez, Cristian

AU - Gentil, Paulo

AU - Moran, Jason

AU - García Pinillos, Felipe

AU - Alonso-Martínez, Alicia M.

AU - Izquierdo, Mikel

PY - 2018/8/20

Y1 - 2018/8/20

N2 - The purpose of this study was to compare the inter-individual variability in the effects of plyometric jump training (PJT) on measures of physical fitness (sprint time; change of direction speed; countermovement jump; 20- and 40-cm drop jump reactive strength index; multiple 5 bounds distance; maximal kicking distance; and 2.4-km time trial) in youth soccer players who completed a PJT programme versus players who completed soccer training only. In a single-blinded study, participants aged between 10 and 16 years were randomly divided into a PJT group (n=38) and a control group (n=38). The experimental group participated in a PJT programme twice weekly for 7 weeks, whereas the control group continued with their regular soccer training sessions. Between-group differences were examined using a Mann-Whitney U test. Non-responders (NR) where defined as individuals who failed to demonstrate any beneficial change that was greater than two times the typical error of measurement (TE) from zero. The results indicated that the mean group improvement for all physical fitness measures was greater (p<0.05) in the PJT group (∆ = 0.4% to 23.3%; ES = 0.04 to 0.58) than in the control group (∆ = 0.1% to 3.8%; ES = 0.02 to 0.35). In addition, a significantly greater (p<0.05) number of responders across all dependent variables was observed in the PJT group (from 4 up to 33 responders) than in the control group (from 0 up to 9 responders). In conclusion, compared to soccer training only, PJT induced greater physical fitness improvements in youth soccer players, with a greater number of responders for all the physical fitness tests related to jumping, speed, change of direction speed, endurance, and kicking technical ability.

AB - The purpose of this study was to compare the inter-individual variability in the effects of plyometric jump training (PJT) on measures of physical fitness (sprint time; change of direction speed; countermovement jump; 20- and 40-cm drop jump reactive strength index; multiple 5 bounds distance; maximal kicking distance; and 2.4-km time trial) in youth soccer players who completed a PJT programme versus players who completed soccer training only. In a single-blinded study, participants aged between 10 and 16 years were randomly divided into a PJT group (n=38) and a control group (n=38). The experimental group participated in a PJT programme twice weekly for 7 weeks, whereas the control group continued with their regular soccer training sessions. Between-group differences were examined using a Mann-Whitney U test. Non-responders (NR) where defined as individuals who failed to demonstrate any beneficial change that was greater than two times the typical error of measurement (TE) from zero. The results indicated that the mean group improvement for all physical fitness measures was greater (p<0.05) in the PJT group (∆ = 0.4% to 23.3%; ES = 0.04 to 0.58) than in the control group (∆ = 0.1% to 3.8%; ES = 0.02 to 0.35). In addition, a significantly greater (p<0.05) number of responders across all dependent variables was observed in the PJT group (from 4 up to 33 responders) than in the control group (from 0 up to 9 responders). In conclusion, compared to soccer training only, PJT induced greater physical fitness improvements in youth soccer players, with a greater number of responders for all the physical fitness tests related to jumping, speed, change of direction speed, endurance, and kicking technical ability.

KW - Football

KW - Force-velocity curve

KW - Jump training

KW - Maturation

KW - Strength

KW - Stretch-shortening cycle

U2 - 10.3389/fphys.2018.01156

DO - 10.3389/fphys.2018.01156

M3 - Journal Article

JO - Frontiers in Physiology

JF - Frontiers in Physiology

SN - 1664-042X

ER -

Ramírez-Campillo R, Álvarez C, Gentil P, Moran J, García Pinillos F, Alonso-Martínez AM et al. Inter-individual variability in responses to 7 weeks of plyometric jump training in male youth soccer players. Frontiers in Physiology. 2018 Aug 20. https://doi.org/10.3389/fphys.2018.01156