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Effects of blood flow restriction during inter-set rest interval in high-intensity resistance training on muscular activation and metabolic stress

Grant number: 14/20369-1
Support type:Regular Research Grants
Duration: March 01, 2015 - February 28, 2017
Field of knowledge:Health Sciences - Physical Education
Principal researcher:Renato Barroso da Silva
Grantee:Renato Barroso da Silva
Home Institution: Faculdade de Educação Física (FEF). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

Neuromuscular adaptations to resistance training (RT) include the increase in strength and in muscle mass (hypertrophy). Traditional recommendations to RT practitioners aiming hypertrophy include performing moderate to high volume (sets x reps) with intensity >70% of 1RM. However, low-intensity RT (20-50% 1RM) combined with blood flow restriction (BFR) may elicit hypertrophy similar to that observed in high-intensity RT. Beneficial effects of BFR are associated with reduced oxygen supply, increased metabolic stress and muscle recruitment. These effects seem to be greater when BFR is applied not only during muscle contractions but also during inter-set rest interval. The aim of this study is to investigate metabolic stress and muscle activation during high-intensity RT with BFR applied only during contractions or only during inter-set rest interval. Fifteen volunteers will participate in three experimental sessions. They will be asked to perform 4 sets of 8 reps with 70% of their 1RM with 1min rest interval in the leg extension exercise in one of the three experimental conditions: no BFR, BFR during contractions only and BFR during interval only. Blood lactate concentration will be assessed before, during inter-set interval and 3, 5, 7 and 10 min after the end of the exercise. Muscle activation will be assessed with the use of surface electromyography during exercise contractions. Maximal isometric force will be assessed before and at the end of the RT session. It is expected that applying BFR during inter-set rest interval increases metabolic stress and muscle activation. These results would indicate that combining BFR with high intensity contractions may have beneficial effects as long as BFR be applied during inter-set rest interval. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CARVALHO, LEONARDO; JUNIOR, ROBERTO MORIGGI; TRUFFI, GABRIEL; SERRA, ADRIANO; SANDER, RAFAELA; DE SOUZA, EDUARDO O.; BARROSO, RENATO. Is stronger better? Influence of a strength phase followed by a hypertrophy phase on muscular adaptations in resistance-trained men. RESEARCH IN SPORTS MEDICINE, NOV 2020. Web of Science Citations: 0.
CARVALHO, LEONARDO; BARROSO, RENATO. Muscle thickness and strength adaptations in dominant and non-dominant upper limbs. JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS, v. 60, n. 6, p. 809-813, JUN 2020. Web of Science Citations: 0.
CARVALHO, LEONARDO; BARROSO, RENATO. ISCHEMIC PRECONDITIONING IMPROVES STRENGTH ENDURANCE PERFORMANCE. JOURNAL OF STRENGTH AND CONDITIONING RESEARCH, v. 33, n. 12, p. 3332-3337, DEC 2019. Web of Science Citations: 1.
TEIXEIRA, EMERSON L.; BARROSO, RENATO; SILVA-BATISTA, CARLA; LAURENTINO, GILBERTO C.; LOENNEKE, JEREMY P.; ROSCHEL, HAMILTON; UGRINOWITSCH, CARLOS; TRICOLI, VALMOR. BLOOD FLOW RESTRICTION INCREASES METABOLIC STRESS BUT DECREASES MUSCLE ACTIVATION DURING HIGH-LOAD RESISTANCE EXERCISE. MUSCLE & NERVE, v. 57, n. 1, p. 107-111, JAN 2018. Web of Science Citations: 4.

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