Isometric pre-conditioning blunts exercise-induced muscle damage but does not attenuate changes in running economy following downhill running

Autor(es)

Lima, Leonardo C. R. ^{[1, 2, 3]} ; Bassan, Natalia M. ^[1] ; Cardozo, Adalgiso C. ^[4] ; Goncalves, Mauro ^[4] ; Greco, Camila C. ^[1] ; Denadai, Benedito S. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Human Performance Lab, Av 24-A, 1515, BR-13506900 Rio Claro, SP - Brazil

^[2] Ctr Univ Herminio Ometto, Fac Biol & Hlth Sci, Av Maximilian Baruto 500, BR-13607339 Araras, SP - Brazil

^[3] Ctr Univ Salesian Sao Paulo, Fac Phys Educ, Rua Baronesa Geraldo Resende 330, BR-13075270 Campinas, SP - Brazil

^[4] Sao Paulo State Univ, Biomech Lab, Av 24-A, 1515, BR-13506900 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HUMAN MOVEMENT SCIENCE; v. 60, p. 1-9, AUG 2018.
• Citações Web of Science: 1

Resumo

Running economy (RE) is impaired following unaccustomed eccentric-biased exercises that induce muscle damage. It is also known that muscle damage is reduced when maximal voluntary isometric contractions (MVIC) are performed at a long muscle length 2-4 days prior to maximal eccentric exercise with the same muscle, a phenomenon that can be described as isometric preconditioning (IPC). We tested the hypothesis that IPC could attenuate muscle damage and changes in RE following downhill running. Thirty untrained men were randomly assigned into experimental or control groups and ran downhill on a treadmill (- 15%) for 30 min. Participants in the experimental group completed 10 MVIC in a leg press machine two days prior to downhill running, while participants in the control group did not perform IPC. The magnitude of changes in muscle soreness determined 48 h after downhill running was greater for the control group (122 +/- 28 mm) than for the experimental group (92 +/- 38 mm). Isometric peak torque recovered faster in the experimental group compared with the control group (3 days vs. no full recovery, respectively). No significant effect of IPC was found for countermovement jump height, serum creatine kinase activity or any parameters associated with RE. These results supported the hypothesis that IPC attenuates changes in markers of muscle damage. The hypothesis that IPC attenuates changes in RE was not supported by our data. It appears that the mechanisms involved in changes in markers of muscle damage and parameters associated with RE following downhill running are not completely shared. (AU)

• Processo FAPESP: 16/04909-1 - Efeitos da realização de contrações isométricas máximas dos extensores do joelho no dano muscular e economia de corrida após corrida em Downhill
• Beneficiário: Leonardo Coelho Rabello de Lima
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 13/23585-4 - Relação entre economia de corrida e força muscular: Análise pelo modelo de dano muscular induzido pela corrida em declive
• Beneficiário: Leonardo Coelho Rabello de Lima
• Modalidade de apoio: Bolsas no Brasil - Doutorado