title: Analysis of autonomic modulation after an acute session of resistance exercise at different intensities in chronic obstructive pulmonary disease patients.
abstract: OBJECTIVE
  Physical exercises are employed as part of the treatment of patients with chronic obstructive pulmonary disease (COPD); however information regarding cardiac autonomic modulation after an acute session of resistance exercise (RE) is unknown. The aim of this study was to evaluate the cardiac autonomic modulation, via heart rate variability after an acute session of RE applied at different intensities in COPD patients.
  
  
  METHODS
  Twelve COPD patients underwent an acute session of RE with an intensity of 60% and another of 90% of the one repetition maximum test. For analysis of autonomic modulation, heart rate was recorded beat-by-beat for 20 minutes at rest and after the training session. Heart rate variability indexes were obtained in the time and frequency domains for the assessment of autonomic modulation.
  
  
  RESULTS
  Regardless of exercise intensity, RE acute sessions influenced the autonomic modulation when the recovery period was compared with the baseline. An increase in standard deviation of normal to normal RR intervals was observed throughout recovery time after the RE, as compared to baseline in both protocols: 60% and 90% of the one repetition maximum test. The spectral component of low frequency index (ms) was higher throughout recovery when compared to baseline in both protocols. The same was also observed in the spectral component of high frequency index (ms) for the protocols of 60% and 90%.
  
  
  CONCLUSIONS
  RE sessions impact on the autonomic modulation of COPD patients by promoting differences in the recovery period compared to baseline, regardless of the intensity of the exercise performed.
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Juliana
authors: J
authors: Nicolino
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Dionei
authors: D
authors: Ramos
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Marceli Rocha
authors: MR
authors: Leite
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Fernanda Maria Machado
authors: FM
authors: Rodrigues
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Bruna Spolador
authors: BS
authors: de Alencar Silva
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Guilherme Yassuyuki
authors: GY
authors: Tacao
authors: Department of Pathology, School of Medicine of the University of São Paulo, São Paulo, Brazil.
authors: Alessandra Choqueta
authors: AC
authors: de Toledo
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Luiz Carlos Marques
authors: LC
authors: Vanderlei
authors: Department of Physiotherapy, Paulista State University (UNESP), Presidente Prudente, São Paulo, Brazil.
authors: Ercy Mara Cipulo
authors: EM
authors: Ramos
mesh_terms: D000368:Aged; D001341:Autonomic Nervous System / Q000503:physiopathology*; D006321:Heart / Q000294:innervation*; D006339:Heart Rate; D006801:Humans; D008168:Lung / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy*; D020127:Recovery of Function; D055070:Resistance Training; D013147:Spirometry; D013997:Time Factors; D016896:Treatment Outcome
keywords: autonomic nervous system; heart rate variability; parasympathetic nervous system; physical exercise; sympathetic nervous system