Acute Hormonal Responses to Multi-Joint Resistance Exercises with Blood Flow Restriction

• Autor(a) principal: Vilaça-Alves, J
• Data de Publicação: 2022
• Outros Autores: Magalhães, P.S., Rosa, C.V., Garrido, N.D., Payan-Carreira, R, Neto, G.R., Costa, P.B.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10174/33151; https://doi.org/Vilaça-Alves, J.; Magalhães, P.S.; Rosa, C.V.; Reis, V.M.; Garrido, N.D.; Payan-Carreira, R.; Neto, G.R.; Costa, P.B. Acute Hormonal Responses to Multi-Joint Resistance Exercises with Blood Flow Restriction. J. Funct. Morphol. Kinesiol. 2023, 8, 3. https://doi.org/10.3390/ jfmk8010003; https://doi.org/10.3390/ jfmk8010003
• topic: vascular occlusion; kaatsu training; resistance training; testosterone; cortisol; growth hormone

The purpose of this study was to investigate the acute effects of multi-joint resistance exercises (MJRE) with blood flow restriction on hormonal responses. Ten men participated in the study and underwent two experimental protocols in random order: four sets (30, 15, 15, and 15 reps, respectively) of MJRE (half squat and horizontal chest press) were performed with 20% of 1RM and a rest time between sets of 30 s, combined with intermittent blood flow restriction (LI + BFR protocol); and four sets (8, 8, 8, 20 reps, respectively) of the same MJRE performed with 75% of 1RM load (HI protocol), with a 90 s rest between the first three sets and 30 s between the third to the fourth set. Blood samples were collected before (PRE), immediately after (POST), and 15 min after the performance of MJRE (POST15). A time effect was observed for growth hormone (GH) and insulin-like-growth-factor-1-binding-protein-3 (IGFPB-3), but no protocol effects or interactions between protocol and times were observed (p > 0.05). There was no effect of either protocol or time (p > 0.05) on total testosterone, free testosterone, or cortisol concentrations. However, significant (p < 0.05) increases were observed in the GH serum concentrations of 2072.73% and 2278.5%, HI, and LI + BFR protocols, respectively, from the PRE to POST15 test. In addition, there was an increase of 15.30% and 13.29% in the IGFPB-3 concentrations (p < 0.05) from PRE to POST0 times for HI and LI + BFR protocols, respectively. Furthermore, there was a decrease of 6.17% and 11.54%, p = 0.00, between the times POST0 to POST15 in the IGFPB-3 for the HI and LI + BFR protocols, respectively. It is concluded that multi-joint resistance exercises combined with intermittent blood flow restriction seemed to promote acute hormonal responses in a manner similar to traditional exercise with high loads. Future studies may investigate whether chronic use of LI + BFR with MJRE may promote muscle hypertrophy.