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Autonomic cardiovascular response during the isometric Cuban test of the sustained weight
Author(s) -
SanchezHechavarria Miguel,
CarrazanaEscalona Ramon,
RicardoFerro Beatriz,
CutinoClavel Ileana,
LopezGalan Erislandis
Publication year - 2017
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.31.1_supplement.708.7
Subject(s) - isometric exercise , sample entropy , cardiology , medicine , heart rate variability , blood pressure , cold pressor test , heart rate , mathematics , statistics , time series
The Test of the Sustained Weight (TSW) is an isometric exercise, similar to hand grip, often used in Cuba to induce hemodynamic responses in order to identify individuals with cardiovascular hyperreactivity. However the dynamic changes in the autonomic cardiovascular responses are not totally elucidated. Objective Determining the autonomic cardiovascular response during the isometric Cuban test of the sustained weight. Methods We used a quasi‐experimental (crossover) design of 20 healthy subjects. Following 10 min for acclimation, we evaluated 5 min before (basal), 2 min during TSW, and 3 min of recovery while performing ausculatory blood pressure measurement and analysis of the variability of the RR intervals (HRV) from DII derivation of ECG record (1kHz) using Powerlab® AD Instruments. R‐R intervals were analyzed using frequency (Fourier) and time‐frequency (Wavelet) methods of the bands of high frequency (HF: 0,15–0,4) and low frequency (LF: 0,04–0,15), as well as temporal and nonlinear (Sample Entropy) analysis. Results We did not observe significant differences in the indicators of the temporal (SDNN, RMSSD, pNN50) and frequency analyses (LF, HF, LF/HF). We did observe a significant change in arterial pressure in the TSW with respect to rest and this was associated with the increment of complexity (entropy) and with a peak in the LF and ratio LF/HF around the 2 min reflected by time‐frequency methods. Conclusions The dynamic changes in the sympathetic cardiovascular response during the Test of the Sustained Weight are not evident with traditional lineal methods of HRV due to the non‐stationary and to the increment of the complexity of this physiologic process with regard to basal state. Support or Funding Information Supported by University of Santiago de Cuba, Cuba.