Alterations in peak torque do not occur with hematological changes after muscle fatigue

Frank Shiguemitsu Suzuki, Marcelo Martins Kalytczak, Rodrigo Augusto Ferreira Palomares, Sergio Matias Silva, Fabiano Politi, Adriana Jaime Sbampato, Andrey Jorge Serra, Alexandre Lopes Evangelista, Angélica Castilho Alonso, Aylton Figueira Junior, Duncan Buchan, Julien Baker, Danilo Sales Bocalini

Research output: Contribution to journalArticlepeer-review


Introduction: Muscular fatigue during voluntary muscle contractions is a complex and multifactorial phenomenon associated with central changes and adaptations of the neuromuscular system. Objective: The aim of this study was to analyze the changes in both peak torque and hematological parameters in active and inactive healthy subjects following a muscular fatigue protocol. Methods: Twenty-one healthy adult males performed a muscle fatigue protocol (10 sets, 10 repetitions of knee extension at 75% of the maximal isometric torque (MIT), 120°s-1 and 40 seconds of rest). Hematocrit (Ht), red blood cells (RBC) and leukocytes (L) analysis were evaluated before (B) and after (A) a fatigue test. Results: The inactive group presented impairment only in concentric muscular action of -41±4% in relation to the active (-23±3%) group. No differences were found in hematological parameters in inactive group (Ht, B: 45.00±0.01 vs. A: 47.00±0.01; RBC, B: 442±40 vs. A: 487±41; L, B: 7,565±2,878 vs. A: 8,015±4,224) and the active group (Ht, B: 45.00±0.63 vs. A: 47.00±0.01; RBC, B: 477±30 vs. A: 559±37; L, B: 6,418±3,557 vs. A: 6,632±4,460). Conclusion: Differences were found only in concentric actions between groups. Additionally, there were no relationships found in hematological parameters between groups.
Original languageEnglish
Pages (from-to)246-249
JournalRevista Brasileira de Medicina do Esporte
Issue number3
Publication statusPublished - 1 May 2017


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