Use of Heart Rate Variability to Estimate Lactate Threshold in Coronary Artery Disease Patients during Resistance Exercise

Autor(es)

Simoes, Rodrigo P. ; Mendes, Renata G. ; Castello-Simoes, Viviane ; Catai, Aparecida M. ; Arena, Ross ; Borghi-Silva, Audrey

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SPORTS SCIENCE AND MEDICINE; v. 15, n. 4, p. 649-657, DEC 2016.
• Citações Web of Science: 2

Resumo

The aim of this study was to investigate whether it is possible to identify the first turn point of blood lactate (BL) concentration (1st lactate threshold - LT1) during a discontinuous resistance exercise protocol in coronary artery disease (CAD) patients and verify if heart rate variability (HRV) responses are consistent with BL responses. A total of 22 elderly men, 12 with CAD and 10 apparently healthy (control group = CG), underwent one-repetition maximum (1RM) testing on an inclined leg press. Discontinuous resistance exercise testing (DRET) was initiated at 10% of the 1RM with subsequent increases of 10% until 30% and after this percentage, 5% increments of 1RM was carried out. The load corresponding to LT1 was approximately 30% 1RM in both groups; and the LT1 estimate by HRV was associated with BL responses. HRV indices representing parasympathetic modulation decreased with increasing loads until LT1 and stabilized thereafter in both groups, and HRV indices representing sympathetic and parasympathetic modulations only increased in the CAD group from 30% 1RM with higher values after this load in relation to the CG. We conclude HRV appears to be an effective tool to estimate the LT1 during discontinuous resistance exercise in patients with CAD. In addition, these results may have an impact on the prescription of endurance resistance exercise in the CAD population, as cardiac vagal modulation is an important indicator of cardiovascular protection and the over-activity of sympathetic modulation is related to cardiovascular risk. (AU)

• Processo FAPESP: 15/12763-4 - A exacerbação da DPOC isolada e na coexistência da IC e o suporte ventilatório não invasivo: investigação do impacto sobre a função endotelial e autonômica cardíaca e análise da relação dos desfechos cardiovasculares com aspectos clincos e funcionais
• Beneficiário: Renata Gonçalves Mendes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/04101-1 - Efeitos clínicos, funcionais e sistêmicos da estimulação elétrica neuromuscular corpórea no pós-operatório de cirurgia bariátrica.
• Beneficiário: Audrey Borghi Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular