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Identification of anaerobic threshold by analysis of heart rate variability during discontinuous dynamic and resistance exercise protocols in healthy older men
Author(s) -
Simões Rodrigo Polaquini,
CastelloSimões Viviane,
Mendes Renata Gonçalves,
Archiza Bruno,
Santos Daniel Augusto,
Bonjorno José Carlos,
Oliveira Claudio Ricardo,
Catai Aparecida Maria,
Arena Ross,
BorghiSilva Audrey
Publication year - 2014
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/cpf.12070
Subject(s) - medicine , anaerobic exercise , resistance training , heart rate , heart rate variability , cardiology , physical medicine and rehabilitation , physical therapy , blood pressure
Summary The purposes of this study were to determine anaerobic threshold ( AT ) during discontinuous dynamic and resistive exercise protocols by analysing of heart rate variability ( HRV ) and blood lactate ( BL ) in healthy elderly subjects and compare the cardiovascular, metabolic and autonomic variables obtained from these two forms of exercise. Fourteen elderly (70 ± 4 years) apparently healthy males underwent the following tests: (i) incremental ramp test on cycle ergometer, (ii) one repetition maximum (1 RM ) leg press at 45°, (iii) a discontinuous exercise test on a cycle ergometer ( DET ‐ C ) protocol and (iv) a resistance exercise leg press ( DET ‐L) protocol. Heart rate, blood pressure and BL were obtained during each increment of exercise intensity. No significant differences ( P >0·05) were found between methods of AT determination ( BL and HRV ) nor the relative intensity corresponding to AT (30% of maximum intensity) between the types of exercise ( DET ‐ C and DET ‐ L ). Furthermore, no significant differences ( P >0·05) were found between the DET ‐ C and DET ‐ L in relation to HRV , however, the DET ‐ L provided higher values of systolic blood pressure and BL ( P <0·05) from the intensity corresponding to AT . We conclude that HRV was effective in determination of AT , and the parasympathetic modulation responses obtained during dynamic and resistive exercise protocols were similar when compared at the same relative intensity. However, DET ‐ L resulted in higher values of blood pressure and BL at workloads beyond AT .