Muscular stress is equal when resistance exercise with blood flow restriction is matched in total work volume: A cross-sectional, cross-over study.
Acta Physiol (Oxf)
; 240(3): e14097, 2024 03.
Article
em En
| MEDLINE
| ID: mdl-38230807
ABSTRACT
AIM:
We compared muscular metabolic stress during exercise performed at multiple intensities, from very low to moderate, with blood flow restriction (BFR) adjusted by the same work volume.METHODS:
Twenty-five healthy young adults performed unilateral plantar flexion at 1 repetition/2 s in a magnetic resonance system. The BFR exercise protocols were as follows (A) exercise with 10% of one repetition maximum (1-RM) for 360 s, (B) 15% 1-RM for 240 s, (C) 20% 1-RM for 180 s, (D) 30% 1-RM for 120 s, and (E) 40% 1-RM for 90 s. All protocols had the same total work volume (load × repetitions = 1800). A high-intensity protocol at 65% 1-RM without BFR (60 s) was also performed for comparison. We used 31 P-magnetic resonance spectroscopy to evaluate the muscular metabolic stress in the subjects' calf muscle, defined as decreases in phosphocreatine and intramuscular pH.RESULTS:
The phosphocreatine depletion (A 15.6 ± 0.7, B 14.8 ± 0.8, C 15.2 ± 0.6, D 14.3 ± 0.6, E 10.9 ± 0.5 mM; no significant difference [ns]) and the intramuscular pH decrease (A 6.82 ± 0.02, B 6.84 ± 0.01, C 6.83 ± 0.02, D 6.83 ± 0.02, E 6.77 ± 0.02; ns) at the end of each exercise were similar and greater than those produced by the 65% 1-RM without BFR.CONCLUSION:
If the total work volumes are equal, the metabolic stress in exercising muscle may reach similar levels at the end of exercise with BFR and could provide similar successful training effects.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Treinamento Resistido
Tipo de estudo:
Clinical_trials
/
Prevalence_studies
Limite:
Adult
/
Humans
Idioma:
En
Revista:
Acta Physiol (Oxf)
Assunto da revista:
FISIOLOGIA
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Japão