Lactate and Heart Rate Variability Threshold during Resistance Exercise in the Young and Elderly

Autor(es):Mostrar menos -

Simoes, R. P. ^[1] ; Castello-Simoes, V. ^[1] ; Mendes, R. G. ^[1] ; Archiza, B. ^[1] ; Santos, D. A. ^[1] ; Machado, H. G. ^[1] ; Bonjorno, Jr., J. C. ^[2] ; Oliveira, C. R. ^[3] ; Reis, M. S. ^[4] ; Catai, A. M. ^[1] ; Arena, R. ^{[5, 6, 7]} ; Borghi-Silva, A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Cardiopulm Physiotherapy Lab, Dept Physiotherapy, BR-13560 Sao Carlos - Brazil

^[2] Univ Sao Paulo, BR-13560 Sao Carlos - Brazil

^[3] Univ Fed Sao Carlos, Dept Med, BR-13560 Sao Carlos - Brazil

^[4] Univ Fed Rio de Janeiro, Fac Med, Dept Internal Med, Rio De Janeiro - Brazil

^[5] Univ New Mexico, Latin Amer & Iberian Inst, Albuquerque, NM 87131 - USA

^[6] Univ New Mexico, Dept Orthopaed, Div Phys Therapy, Albuquerque, NM 87131 - USA

^[7] Univ New Mexico, Dept Internal Med, Div Cardiol, Albuquerque, NM 87131 - USA

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF SPORTS MEDICINE; v. 34, n. 11, p. 991-996, NOV 2013.
• Citações Web of Science: 12

Resumo

This purpose of this study was to: 1) determine the intensity corresponding to anaerobic threshold (AT) during a discontinuous resistance exercise protocol in healthy young and elderly subjects by analyzing heart rate variability (HRV) and blood lactate (BL) and 2) investigate the effect of aging on these variables. A total of 28 individuals, 14 young and 14 elderly healthy men underwent one-repetition maximum (1RM) testing to determine maximum load on the leg press. Discontinuous resistance exercise testing was initiated at 10% of the 1RM with subsequent increases of 10%. The load corresponding to AT was approximately 30% 1RM in both groups. The determination of AT by HRV was associated with BL responses (p<0.01). While HRV indexes decreased with increasing of loads in both groups, the elderly had lower values at loads below AT (p<0.05). Additionally, BL increased sharply after the load corresponding to AT in both groups, although elderly subjects showed the lowest values (p<0.05). In conclusion, HRV is an effective tool for determining AT, which was approximately 30% 1RM under the testing procedures included in the present study. Furthermore, there was a marked change in autonomic function, with gradual vagal withdrawal followed by sympathetic activation. These responses were lower in elderly subjects. (AU)

• Processo FAPESP: 09/01842-0 - Análise dos ajustes centrais e metabólicos periféricos durante o exercício físico dinâmico versus resistido em pacientes com DAC: efeitos de um programa de treinamento resistido baseado na determinação do limiar anaeróbio por diferentes metodologias
• Beneficiário: Audrey Borghi Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 09/51976-2 - Analise da cinetica on e off da frequencia cardiaca durante o exercicio fisico dinamico versus resistido em idosos e jovens
• Beneficiário: Rodrigo Polaquini Simões
• Modalidade de apoio: Bolsas no Brasil - Doutorado