Article

An efficient cardiac rehabilitation programme (CRP) can improve the
functional ability of patients after acute coronary syndrome (ACS). OBJECTIVE: To
examine the effect of a CRP on parasympathetic reactivation and heart rate
recovery (HRR) measured after a 6-min walk test (6MWT),
and correlation with 6MWT
distance and well-being after ACS. METHODS: Eleven normoweight patients after ACS
(BMI<25kg/m(2); 10 males; mean [SD] age 61 [9] years) underwent an 8-week CRP.
Before (pre-) and at weeks 4 (W4) and 8 (W8) during the CRP, they performed a
6MWT on a treadmill, followed by 10-min of seated passive recovery, with HRR and
HR variability (HRV) recordings. HRR was measured at 1, 3, 5 and 10min after the
6MWT (HRR1, HRR3, HRR5, HRR10), then modelized by a mono-exponential function.
Time-domain (square root of the mean of the sum of the squares of differences
between adjacent normal R-R intervals [RMSSD]) and frequency-domain (with high-
and low-frequency band powers) were used to analyse HRV. Participants completed a
mental and physical well-being questionnaire at pre- and W8. Exhaustion after
tests was assessed by the Borg scale. Pearson correlation was used to assess
correlations. RESULTS: HRR3, HRR5 and HRR10 increased by 37%, 36% and 28%,
respectively, between pre- and W8 (P<0.05), and were positively correlated with
change in 6MWT distance (r=0.58, 0.66 and 0.76; P<0.05). Percentage change in
HRR3 was positively correlated with change in well-being (r=0.70; P=0.01).
Parasympathic reactivation (RMSSD) was improved only during the first 30sec of
recovery (P=0.04). CONCLUSION: Among patients undergoing a CRP after ACS,
increased HRR after a 6MWT, especially at 3min, was positively correlated with
6MWT distance and improved well-being. HRR raw data seem more sensitive than
post-exercise HRV analysis for monitoring functional and autonomic improvement
after ACS.
CI - Copyright (c) 2017. Published by Elsevier Masson SAS.

Langue : ANGLAIS