title: Cardiac autonomic modulation in healthy elderly after different intensities of dynamic exercise.
abstract: OBJECTIVE
  To investigate the heart rate (HR) and its autonomic modulation at baseline and during dynamic postexercise (P(EX)) with intensities of 40% and 60% of the maximum HR in healthy elderly.
  
  
  METHODS
  This cross-sectional study included ten apparently healthy people who had been submitted to a protocol on a cycle ergometer for 35 minutes. Autonomic modulation was evaluated by spectral analysis of HR variability (HRV).
  
  
  RESULTS
  A relevant increase in HR response was observed at 15 minutes postexercise with intensities of 60% and 40% of the maximum HR (10±2 bpm versus 5±1 bpm, respectively; P=0.005), and a significant reduction in HRV was also noted with 40% and 60% intensities during the rest period, and significant reduction in HRV (RR variance) was also observed in 40% and 60% intensities when compared to the baseline, as well as between the post-exercise intensities (1032±32 ms versus 905±5 ms) (P<0.001). In the HRV spectral analysis, a significant increase in the low frequency component HRV and autonomic balance at 40% of the maximum HR (68±2 normalized units [nu] versus 55±1 nu and 2.0±0.1 versus 1.2±0.1; P<0.001) and at 60% of the maximum HR (77±1 nu versus 55±1 nu and 3.2±0.1 versus 1.2±0.1 [P<0.001]) in relation to baseline was observed. A significant reduction of high frequency component at 40% and 60% intensities, however, was observed when compared to baseline (31±2 nu and 23±1 nu versus 45±1 nu, respectively; P<0.001). Moreover, significant differences were observed for the low frequency and high frequency components, as well as for the sympathovagal balance between participants who reached 40% and 60% of the maximum HR.
  
  
  CONCLUSIONS
  There was an increase in the HR, sympathetic modulation, and sympathovagal balance, as well as a reduction in vagal modulation in the elderly at both intensities of the PEX.
authors: Department of Pathology, Federal University of Pernambuco, Recife, Pernambuco, Brazil.
authors: Viviane Santos López
authors: VS
authors: Droguett
authors: Department of Physical Education, Federal University of Paraiba, João Pessoa, Paraiba, Brazil.
authors: Amilton da Cruz
authors: Ada C
authors: Santos
authors: Department of Physical Education, Federal University of Paraiba, João Pessoa, Paraiba, Brazil.
authors: Carlos Eduardo
authors: CE
authors: de Medeiros
authors: Department of Physical Education, Federal University of Paraiba, João Pessoa, Paraiba, Brazil.
authors: Douglas Porto
authors: DP
authors: Marques
authors: Department of Physical Education, Federal University of Paraiba, João Pessoa, Paraiba, Brazil.
authors: Leone Severino
authors: LS
authors: do Nascimento
authors: Department of Physical Education, Federal University of Paraiba, João Pessoa, Paraiba, Brazil.
authors: Maria do Socorro
authors: Mdo S
authors: Brasileiro-Santos
mesh_terms: D000368:Aged; D000375:Aging / Q000502:physiology; D001341:Autonomic Nervous System / Q000502:physiology*; D003430:Cross-Sectional Studies; D004562:Electrocardiography; D015444:Exercise / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013564:Sympathetic Nervous System / Q000502:physiology
keywords: autonomic nervous system; exercise; heart rate
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