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January 1, 2005International Journal of KAATSU Training ResearchOpen Access

Muscle fiber cross-sectional area is increased after two weeks of twice daily KAATSU-resistance training

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Why the study?

Does low-intensity resistance training combined with KAATSU increase muscle fiber cross-sectional area in young men?

Population

5 young men

Comparison

Low-intensity resistance training combined with… vs Low-intensity resistance training alone, twice…

Design

Other

Follow-up

2 weeks

Authors

TYTomohiro YasudaSeirei Christopher UniversityTATakashi AbeRutgers, The State University of New JerseyYSYoshiaki SatoNagoya University Hospital

Discussion

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Overview

May support short-term type-II hypertrophy with LIT-KAATSU in young men; hypothesis-generating and requires randomized trials before clinical use.

Key Points

  • To determine the impact of low-intensity resistance training combined with venous blood flow restriction on skeletal muscle fiber size and overall muscle cross-sectional area.
  • Five young men were assigned to either low-intensity resistance training (20% of 1-RM) with KAATSU blood flow restriction (160–240 mmHg; n=3) or low-intensity training alone (n=2).
  • Participants trained twice daily for 2 weeks performing 3 sets of two dynamic lower-body exercises.
  • Quadriceps muscle cross-sectional area (CSA) was assessed using magnetic resonance imaging, and vastus lateralis muscle fiber CSA was analyzed via needle biopsy.
  • Type-II muscle fiber CSA increased by 27.6% (p<0.05) in the KAATSU group compared to 0.5% in the control group, whereas type-I fiber CSA changed by 5.9% versus -2.1%.
  • Mean fiber CSA increased by 17.0% in the KAATSU group versus -0.4% in controls.
  • Whole quadriceps CSA enlarged by 7.8% in the KAATSU group compared to 1.8% in the control group, with 1-RM squat strength improving by 14% versus 9%.

Structured PICO

Does low-intensity resistance training combined with KAATSU increase muscle fiber cross-sectional area in young men?

P
Population
5 young men
I
Intervention
Low-intensity (20% of 1-RM) resistance training (LIT) combined with restriction of muscular venous blood flow (KAATSU) (restriction pressure 160-240 mmHg), twice daily for 2 weeks using 3 sets of two dynamic lower body exercises
C
Comparator
Low-intensity resistance training (LIT) alone, twice daily for 2 weeks
O
Outcome
Muscle fiber cross-sectional area (CSA) and quadriceps muscle CSAsurrogate

High frequency low-intensity resistance training with blood flow restriction (KAATSU) induces significant skeletal muscle and type-II fiber hypertrophy in just two weeks.

Cite This Study

Yasuda et al. (2005) studied this question.

synapsesocial.com/papers/6a797ec91b9920df6d8906a3https://doi.org/10.3806/ijktr.1.65
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1The needle biopsy technique for fibre type determination in human skeletal muscle–a methodological study1982 · 135 citations
  2. 2Strength and skeletal muscle adaptations in heavy-resistance-trained women after detraining and retraining1991 · 405 citations
  3. 3Human muscle strength training: the effects of three different regimens and the nature of the resultant changes.1987 · 405 citations
  4. 4Skeletal muscle size and circulating IGF-1 are increased after two weeks of twice daily “KAATSU” resistance training2005 · 275 citations
  5. 5The effect of high‐resistance training on the strength and cross‐sectional area of the human quadriceps1983 · 153 citations