Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2020) 19, 547 - 555

Research article
Effects of 8-Week Jump Training Program on Sprint and Jump Performance and Leg Strength in Pre- and Post-Peak Height Velocity Aged Boys
Tomislav Uzelac-Sciran1, Nejc Sarabon2,3, Pavle Mikulic1, 
Author Information
1 Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia
2 University of Primorska, Koper, Slovenia
3 S2P, Science to Practice, Ltd., Laboratory for Motor Control and Motor Behavior, Ljubljana, Slovenia

Pavle Mikulic
✉ Faculty of Kinesiology, University of Zagreb, Horvacanski zavoj 15, 10000 Zagreb, Croatia
Email: pavle.mikulic@kif.hr
Publish Date
Received: 03-03-2020
Accepted: 15-06-2020
Published (online): 13-08-2020
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ABSTRACT

The purpose of this study was: (a) to determine the effects of an 8-week jump training program on measures of neuromuscular performance in 12-14-year-old boys before and after peak height velocity (PHV), and (b) to compare the effects of the jump training program to the effects of the regular physical education program. One hundred and twenty-six participants were categorized into two maturity groups (pre- or post-PHV) and then randomly assigned to either a jump training (pre-PHV, n = 26; post-PHV, n = 24) or a control (pre-PHV, n = 33; post-PHV, n = 19) group. Jump training consisted of twice-weekly training for 8 weeks, while control groups continued with their regular physical education lessons. Squat jump and countermovement jump height (cm), reactive strength index (the ratio between jump height and ground contact time (mm/ms)), 20-m sprint time (s), and isokinetic knee extensors muscle strength (peak toque (Nm)) were assessed pre- and post-intervention. Following the 8-week intervention, both pre- and post-PHV jump training groups made significant gains in measures of neuromuscular performance irrespective of the maturity (where p < 0.05, d = 0.28-1.00), while changes in these measures in the control groups were not significant (all p ≥ 0.05, d = -0.14-0.15). A series of repeated measures analyses of variance (ANOVA) indicated that (a) the maturity-related differences between jump training groups were observed only for reactive strength index, and (b) the improvements in all measures of neuromuscular performance were greater in jump training than in control group. This study demonstrated that important components of physical fitness in 12-14-year-old schoolboys may be acutely enhanced through a well-structured jump program and maturity seems to at least play a limited role in mediating these enhancements.

Key words: Plyometric training, physical education, maturation, children, adolescents


           Key Points
  • A well-structured jump training program can be effective for acute improvements in components of physical fitness in 12-14-year-old schoolboys.
  • Maturity, as assessed by the year at peak height velocity, seems to at least play a limited role in mediating these enhancements.
  • A well-structured jump training program improves components of physical fitness in 12-14-year-old schoolboys to a greater degree compared to the regular physical education program.
 
 
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