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High-intensity inspiratory protocol increases heart rate variability in myocardial revascularization patients

Overview of attention for article published in Brazilian journal of cardiovascular surgery, February 2016
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Title
High-intensity inspiratory protocol increases heart rate variability in myocardial revascularization patients
Published in
Brazilian journal of cardiovascular surgery, February 2016
DOI 10.5935/1678-9741.20160007
Pubmed ID
Authors

Caruso, Flavia Cristina Rossi, Simões, Rodrigo Polaquini, Reis, Michel Silva, Guizilini, Solange, Alves, Vera Lucia Dos Santos, Papa, Valeria, Arena, Ross, Borghi-Silva, Audrey

Abstract

To evaluate heart rate variability during an inspiratory muscle endurance protocol at three different load levels [30%, 60% and 80% of maximal inspiratory pressure], in patients who had previously undergone coronary artery bypass grafting. Nineteen late postoperative myocardial revascularization patients participating in a cardiovascular rehabilitation program were studied. Maximal inspiratory pressure maneuvers were performed. An inspiratory muscle endurance protocol at 30%, 60% and 80% of maximal inspiratory pressure was applied for four minutes each, in random order. Heart rate and RR intervals were recorded and heart rate variability was analyzed by time (RMSSD-the mean of the standard deviations for all R-R intervals, and RMSM-root-mean square differences of successive R-R intervals) and frequency domains indices (high and low frequency) in normalized units. ANOVA for repeated measurements was used to compare heart rate variability indices and Student t-test was used to compare the maximal inspiratory pressure and maximal expiratory pressure values. Heart rate increased during performance of maximal respiratory pressures maneuvers, and the maximal inspiratory pressure and maximal expiratory pressure mean values were significantly lower than predicted values (P <0.05). RMSSD increased significantly at 80% in relation to rest and 30% of maximal inspiratory pressure and RMSM decreased at 30% and 60% of maximal inspiratory pressure in relation to rest (P <0.05). Additionally, there was significant and progressive decrease in low frequency and increase in high frequency at 30%, 60% and 80% of maximal inspiratory pressure in relation to the resting condition. These results suggest that respiratory muscle training at high intensities can promote greater parasympathetic activity and it may confer important benefits during a rehabilitation program in post-coronary artery bypass grafting.

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Mendeley readers

The data shown below were compiled from readership statistics for 96 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 96 100%

Demographic breakdown

Readers by professional status Count As %
Student > Master 17 18%
Student > Bachelor 11 11%
Student > Postgraduate 6 6%
Professor 6 6%
Student > Doctoral Student 5 5%
Other 23 24%
Unknown 28 29%
Readers by discipline Count As %
Nursing and Health Professions 25 26%
Medicine and Dentistry 14 15%
Sports and Recreations 8 8%
Psychology 5 5%
Agricultural and Biological Sciences 4 4%
Other 6 6%
Unknown 34 35%