PMID- 19826302
OWN - NLM
STAT- MEDLINE
DCOM- 20100225
LR  - 20161018
IS  - 1533-4287 (Electronic)
IS  - 1064-8011 (Linking)
VI  - 23
IP  - 8
DP  - 2009 Nov
TI  - Effects of a back squat training program on leg power, jump, and sprint 
      performances in junior soccer players.
PG  - 2241-9
LID - 10.1519/JSC.0b013e3181b86c40 [doi]
AB  - The aim of the present study was to investigate the effects of voluntary maximal 
      leg strength training on peak power output (Wpeak), vertical jump performance, 
      and field performances in junior soccer players. Twenty-two male soccer players 
      participated in this investigation and were divided into 2 groups: A resistance 
      training group (RTG; age 17 +/- 0.3 years) and a control group (CG; age 17 +/- 
      0.5 years). Before and after the training sessions (twice a week for 2 months), 
      Wpeak was determined by means of a cycling force-velocity test. Squat jump (SJ), 
      countermovement jump (CMJ), and 5-jump test (5-JT) performances were assessed. 
      Kinematics analyses were made using a video camera during a 40-m sprint running 
      test and the following running velocities were calculated: The first step after 
      the start (V(first step)), the first 5 m (V(first 5 meters)), and between the 35 
      m and 40 m (V(max)). Back half squat exercises were performed to determine 
      1-repetition maximum (1-RM). Leg and thigh muscle volume and mean thigh 
      cross-sectional area (CSA) were assessed by anthropometry. The resistance 
      training group showed improvement in Wpeak (p < 0.05), jump performances (SJ, p < 
      0.05 and 5-JT, p < 0.001), 1-RM (p < 0.001) and all sprint running calculated 
      velocities (p < 0.05 for both V(first step) and V(first 5 meters), p < 0.01 for 
      V(max)). Both typical force-velocity relationships and mechanical parabolic 
      curves between power and velocity increased after the strength training program. 
      Leg and thigh muscle volume and CSA of RTG remained unchanged after strength 
      training. Back half squat exercises, including adapted heavy loads and only 2 
      training sessions per week, improved athletic performance in junior soccer 
      players. These specific dynamic constant external resistance exercises are highly 
      recommended as part of an annual training program for junior soccer players.
FAU - Chelly, Mohamed Souhaiel
AU  - Chelly MS
AD  - Faculty of Medicine Ibn-El-jazzar, Sousse, Tunisia. csouhaiel@yahoo.fr
FAU - Fathloun, Mourad
AU  - Fathloun M
FAU - Cherif, Najet
AU  - Cherif N
FAU - Ben Amar, Mohamed
AU  - Ben Amar M
FAU - Tabka, Zouhair
AU  - Tabka Z
FAU - Van Praagh, Emmanuel
AU  - Van Praagh E
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Strength Cond Res
JT  - Journal of strength and conditioning research
JID - 9415084
SB  - IM
MH  - Adolescent
MH  - Analysis of Variance
MH  - Anthropometry
MH  - Biomechanical Phenomena
MH  - Exercise Test
MH  - Humans
MH  - Leg/*physiology
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Muscle, Skeletal/*physiology
MH  - Resistance Training/*methods
MH  - Running/physiology
MH  - Soccer/*physiology
MH  - Treatment Outcome
MH  - Video Recording
EDAT- 2009/10/15 06:00
MHDA- 2010/02/26 06:00
CRDT- 2009/10/15 06:00
PHST- 2009/10/15 06:00 [entrez]
PHST- 2009/10/15 06:00 [pubmed]
PHST- 2010/02/26 06:00 [medline]
AID - 10.1519/JSC.0b013e3181b86c40 [doi]
PST - ppublish
SO  - J Strength Cond Res. 2009 Nov;23(8):2241-9. doi: 10.1519/JSC.0b013e3181b86c40.