PMID- 35770193
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 1664-042X (Print)
IS  - 1664-042X (Electronic)
IS  - 1664-042X (Linking)
VI  - 13
DP  - 2022
TI  - Low-Load Blood Flow Restriction Squat as Conditioning Activity Within a Contrast 
      Training Sequence in High-Level Preadolescent Trampoline Gymnasts.
PG  - 852693
LID - 10.3389/fphys.2022.852693 [doi]
LID - 852693
AB  - To investigate the effects of implementing low-load blood flow restriction 
      exercises (LL-BFRE) instead of high-load exercises (HL-RE) in a contrast training 
      program on strength and power performance of high-level young gymnasts. Fifteen 
      high-level pre-pubescent trampoline gymnasts (national level, Tanner Stage II, 
      intermediate experience in strength training) were divided into two groups to 
      complete the same structure of a ten-week contrast strength training program 
      differing only in the configuration of the first resistance exercise of the 
      contrast sequence. The LL-BFRE group (n = 7, four girls, 13.9 +/- 0.4 y) performed 
      the first resistance exercise of the contrast with LL-BFRE (20%-30% 1RM, 
      perceived pressure of 7 on a scale from 0 to 10). The HL-RE group (n = 8, four 
      girls, 13.8 +/- 0.5 y) trained the first resistance exercise of the contrast 
      sequence with moderate-to-high load (60%-85% 1RM). Before and after the training 
      period, isometric mid-thigh pull (IMTP), squat jump (SJ), counter movement jump 
      (CMJ), and drop-jump (DJ) were performed to evaluate the effect of the 
      intervention on strength and power capacities as primary outcomes. Changes in 
      participants' anthropometric measures, muscle mass, left and right thigh girth, 
      IMTP relative to bodyweight (IMTP-R), eccentric utilization ratio (EUR), and 
      reactive strength index (RSI) were assessed as secondary outcomes. There was no 
      significant interaction (p > 0.05) between group x time in any power and strength 
      outcome, although SJ and EUR showed a trend to significant interaction (p = 0.06 
      and p = 0.065, respectively). There was an overall effect of time (p < 0.05) in 
      all power and strength variables (CMJ, SJ, EUR, DJ, RSI, IMTP, and IMTP-R). There 
      was a significant interaction in muscle mass (MM) [beta = 0.57 kg, 95% CI = (0.15; 
      0.98), t(13) = 2.67, p = 0.019], revealing that participants in LL-BFRE increased 
      their muscle mass (6.6 +/- 3.1%) compared to HL-RE (3.6 +/- 2.0%). Anthropometric 
      variables did not present any group or interaction effect. However, there was a 
      time effect (p < 0.05). Implementing LL-BFRE in place of HL-RE as a conditioning 
      activity in a contrast training sequence might be equally effective in improving 
      lower-body strength and power in preadolescent trampoline gymnasts.
CI  - Copyright (c) 2022 Yang, Zhang, Sevilla-Sanchez, Zhou, Cao, He, Gao and 
      Carballeira.
FAU - Yang, Shengtao
AU  - Yang S
AD  - School of Physical Education and Training, Shanghai University of Sport, 
      Shanghai, China.
AD  - Professional Sports Research Center, Shanghai Research Institute of Sports 
      Science, Shanghai, China.
FAU - Zhang, Peng
AU  - Zhang P
AD  - Professional Sports Research Center, Shanghai Research Institute of Sports 
      Science, Shanghai, China.
FAU - Sevilla-Sanchez, Marta
AU  - Sevilla-Sanchez M
AD  - Department of Physical Education and Sport, Faculty of Sport Sciences and 
      Physical Education, Campus Bastiagueiro, University of A Coruna, Oleiros, Spain.
FAU - Zhou, Dong
AU  - Zhou D
AD  - Professional Sports Research Center, Shanghai Research Institute of Sports 
      Science, Shanghai, China.
FAU - Cao, Jie
AU  - Cao J
AD  - Professional Sports Research Center, Shanghai Research Institute of Sports 
      Science, Shanghai, China.
FAU - He, Jiajian
AU  - He J
AD  - Professional Sports Research Center, Shanghai Research Institute of Sports 
      Science, Shanghai, China.
FAU - Gao, Binghong
AU  - Gao B
AD  - School of Physical Education and Training, Shanghai University of Sport, 
      Shanghai, China.
FAU - Carballeira, Eduardo
AU  - Carballeira E
AD  - Department of Physical Education and Sport, Faculty of Sport Sciences and 
      Physical Education, Campus Bastiagueiro, University of A Coruna, Oleiros, Spain.
LA  - eng
PT  - Journal Article
DEP - 20220613
PL  - Switzerland
TA  - Front Physiol
JT  - Frontiers in physiology
JID - 101549006
PMC - PMC9234321
OTO - NOTNLM
OT  - blood flow restriction training
OT  - contrast strength training
OT  - high-load resistance exercise
OT  - jump height
OT  - maximal isometric strength
OT  - young athletes
COIS- The authors declare that the research was conducted in the absence of any 
      commercial or financial relationships that could be construed as a potential 
      conflict of interest.
EDAT- 2022/07/01 06:00
MHDA- 2022/07/01 06:01
PMCR- 2022/06/13
CRDT- 2022/06/30 02:53
PHST- 2022/01/11 00:00 [received]
PHST- 2022/05/23 00:00 [accepted]
PHST- 2022/06/30 02:53 [entrez]
PHST- 2022/07/01 06:00 [pubmed]
PHST- 2022/07/01 06:01 [medline]
PHST- 2022/06/13 00:00 [pmc-release]
AID - 852693 [pii]
AID - 10.3389/fphys.2022.852693 [doi]
PST - epublish
SO  - Front Physiol. 2022 Jun 13;13:852693. doi: 10.3389/fphys.2022.852693. eCollection 
      2022.