PDF herunterladen
Int J Sports Med 2013; 34(11): 991-996
DOI: 10.1055/s-0033-1337946
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

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

Authors

  • R. P. Simões

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • V. Castello-Simões

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • R. G. Mendes

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • B. Archiza

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • D. A. Santos

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • H. G. Machado

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • J. C. Bonjorno jr

    2   Bioengineering Post-graduation, University of Sao Paulo, Sao Carlos, Brazil

  • C. R. Oliveira

    3   Medicine Department of Federal University of Sao Carlos, Federal University of Sao Carlos, Sao Carlos, Brazil

  • M. S. Reis

    5   Division of Physical Therapy, Department of Orthopaedics, Division of Cardiology, Department of Internal Medicine, and Latin American and Iberian Institute, University of New Mexico, Albuquerque, United States

  • A. M. Catai

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil

  • R. Arena

    5   Division of Physical Therapy, Department of Orthopaedics, Division of Cardiology, Department of Internal Medicine, and Latin American and Iberian Institute, University of New Mexico, Albuquerque, United States

  • A. Borghi-Silva

    1   Department of Physiotherapy, Cardiopulmonary Physiotherapy Laboratory, Nucleus of Research in Physical Exercise, Federal University of Sao Carlos, Sao Carlos, Brazil
Weitere Informationen

Publikationsverlauf



accepted after revision 13. Februar 2013

Publikationsdatum:
19. April 2013 (online)

Auch verfügbar auf
   Lizenzen und Reprints
Preview

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.

Key words

aging - exercise - autonomic cardiac control - blood lactate