PMID- 31821993
OWN - NLM
STAT- MEDLINE
DCOM- 20210407
LR  - 20210407
IS  - 1543-3072 (Electronic)
IS  - 1056-6716 (Linking)
VI  - 29
IP  - 7
DP  - 2020 Sep 1
TI  - Acute Muscular Responses to Practical Low-Load Blood Flow Restriction Exercise 
      Versus Traditional Low-Load Blood Flow Restriction and High-/Low-Load Exercise.
PG  - 984-992
LID - jsr.2019-0217 [pii]
LID - 10.1123/jsr.2019-0217 [doi]
AB  - CONTEXT: Blood flow restriction (BFR) increases muscle size and strength when 
      combined with low loads, but various methods are used to produce this stimulus. 
      It is unclear how using elastic knee wraps can impact acute muscular responses 
      compared with using nylon cuffs, where the pressure can be standardized. 
      OBJECTIVE: Investigate how elastic knee wraps compare with nylon cuffs and 
      high-load (HL)/low-load (LL) resistance exercise. DESIGN: A randomized cross-over 
      experimental design using 6 conditions combined with unilateral knee extension. 
      SETTING: Human Performance Laboratory. PARTICIPANTS: A total of 9 healthy 
      participants (males = 7 and females = 2) and had an average age of 22 (4) years. 
      INTERVENTION: LL (30% of 1-repetition maximum [1-RM]), HL (70% 1-RM), BFR at 40% 
      of arterial occlusion pressure (BFR-LOW), BFR at 80% of arterial occlusion 
      pressure (BFR-HIGH), elastic knee wraps stretched by 2 in (PRACTICAL-LOW), and 
      elastic knee wraps stretched to a new length equivalent to 85% of thigh 
      circumference (PRACTICAL-HIGH). BFR and practical conditions used 30% 1-RM. MAIN 
      OUTCOME MEASURES: Muscle thickness, maximum voluntary isometric contraction, and 
      electromyography amplitude. Bayesian statistics evaluated differences in changes 
      between conditions using the Bayes factor (BF10), and median and 95% credible 
      intervals were reported from the posterior distribution. RESULTS: Total 
      repetitions completed were greater for BFR-LOW versus PRACTICAL-HIGH (BF10 = 3.2, 
      48.6 vs 44 repetitions) and greater for PRACTICAL-LOW versus BFR-HIGH (BF10 = 
      717, 51.8 vs 36.3 repetitions). Greater decreases in changes in maximum voluntary 
      isometric contraction were found in PRACTICAL-HIGH versus HL (BF10 = 1035, 
       approximately 103 N) and LL (BF10 = 45,  approximately 66 N). No differences in changes in muscle thickness 
      were found between LL versus PRACTICAL-LOW/PRACTICAL-HIGH conditions (BF10 = 
      0.32). Greater changes in electromyography amplitude were also found for BFR-LOW 
      versus PRACTICAL-HIGH condition (BF10 = 6.13,  approximately 12%), but no differences were 
      noted between the other BFR conditions. CONCLUSIONS: Overall, elastic knee wraps 
      produce a more fatiguing stimulus than LL or HL conditions and might be used as 
      an alternative to pneumatic cuffs that are traditionally used for BFR exercise.
FAU - Thiebaud, Robert S
AU  - Thiebaud RS
FAU - Abe, Takashi
AU  - Abe T
FAU - Loenneke, Jeremy P
AU  - Loenneke JP
FAU - Garcia, Tyler
AU  - Garcia T
FAU - Shirazi, Yohan
AU  - Shirazi Y
FAU - McArthur, Ross
AU  - McArthur R
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
DEP - 20191209
PL  - United States
TA  - J Sport Rehabil
JT  - Journal of sport rehabilitation
JID - 9206500
SB  - IM
MH  - Adult
MH  - Cross-Over Studies
MH  - Electromyography
MH  - Female
MH  - Humans
MH  - Male
MH  - Muscle Strength/*physiology
MH  - Quadriceps Muscle/*blood supply/*physiology
MH  - Regional Blood Flow/*physiology
MH  - Resistance Training/*methods
MH  - Tourniquets
MH  - Young Adult
OTO - NOTNLM
OT  - elastic knee wraps
OT  - muscle thickness
OT  - vascular occlusion
EDAT- 2019/12/11 06:00
MHDA- 2021/04/10 06:00
CRDT- 2019/12/11 06:00
PHST- 2019/05/20 00:00 [received]
PHST- 2019/09/19 00:00 [revised]
PHST- 2019/10/15 00:00 [accepted]
PHST- 2019/12/11 06:00 [pubmed]
PHST- 2021/04/10 06:00 [medline]
PHST- 2019/12/11 06:00 [entrez]
AID - jsr.2019-0217 [pii]
AID - 10.1123/jsr.2019-0217 [doi]
PST - epublish
SO  - J Sport Rehabil. 2019 Dec 9;29(7):984-992. doi: 10.1123/jsr.2019-0217. Print 2020 
      Sep 1.