BLOOD FLOW RESTRICTION INCREASES METABOLIC STRESS BUT DECREASES MUSCLE ACTIVATION DURING HIGH-LOAD RESISTANCE EXERCISE

Autor(es)

Teixeira, Emerson L. ^[1] ; Barroso, Renato ^[2] ; Silva-Batista, Carla ^[1] ; Laurentino, Gilberto C. ^[1] ; Loenneke, Jeremy P. ^[3] ; Roschel, Hamilton ^[1] ; Ugrinowitsch, Carlos ^[1] ; Tricoli, Valmor ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Phys Educ & Sport, Ave Prof Mello Moraes 65, BR-05508030 Sao Paulo, SP - Brazil

^[2] Univ Estadual Campinas, Fac Phys Educ, Campinas, SP - Brazil

^[3] Univ Mississippi, Kevser Ermin Appl Physiol Lab, Dept Hlth Exercise Sci & Recreat Management, Oxford, MS - USA

• Tipo de documento: Artigo Científico
• Fonte: MUSCLE & NERVE; v. 57, n. 1, p. 107-111, JAN 2018.
• Citações Web of Science: 4

Resumo

Introduction: We investigated differences in metabolic stress (lactate) and muscle activation (electromyography; EMG) when high-load resistance exercise (HL) is compared with a condition in which blood flow restriction (BFR) is applied during the exercise or during the rest interval. Methods: Twelve participants performed HL with BFR during the intervals (BFRI), during the set (BFR-S), and without BFR. Each condition consisted of 3 sets of 8 repetitions with knee extension at 70% of 1-repetition maximum. Lactate and root mean square (RMS) from the surface EMG of the vastus lateralis were calculated. Results: Lactate increased in all protocols but was higher with BFR-I than with BFR-S and HL. RMS decreased under all conditions, with a larger effect size in BFR-I (1.47) than in BFR-S (0.66) and HL (0.59). Discussion: BFR-I increases lactate, possibly as a result of reduced restoration of ATP. Muscle activation seems to be impacted by mechanical stress but may be reduced by metabolic stress. (AU)

• Processo FAPESP: 14/20369-1 - Efeito da restrição de fluxo sanguíneo no intervalo entre séries de treinamento de força em alta intensidade na ativação muscular e estresse metabólico
• Beneficiário: Renato Barroso da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular