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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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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]
Total Authors: 12
Affiliation:
[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
Total Affiliations: 7
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF SPORTS MEDICINE; v. 34, n. 11, p. 991-996, NOV 2013.
Web of Science Citations: 12
Abstract

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)

FAPESP's process: 09/01842-0 - Analysis of central and peripheral muscle metabolism and adjustments on dynamic versus resistance exercise in coronary arterial disease patients: effects of resistance physical training program based on anaerobic threshold by different methodologies
Grantee:Audrey Borghi Silva
Support Opportunities: Research Grants - Young Investigators Grants