Short-term effects of a 3-week interval training program on heart rate variability in chronic heart failure. A randomised controlled trial.
Ann Phys Rehabil Med
; 62(5): 321-328, 2019 Sep.
Article
en En
| MEDLINE
| ID: mdl-31352063
ABSTRACT
BACKGROUND:
Exaggerated sympathetic nervous system activity associated with low heart rate variability (HRV) is considered to trigger cardiac arrhythmias and sudden death. Regular exercise training is efficient to improve autonomic balance.OBJECTIVE:
We aimed to verify the superiority of high-intensity interval training (HIIT) to enhance HRV, cardiorespiratory fitness and cardiac function as compared with moderate intensity continuous training (MICT) in a short, intense cardiac rehabilitation program.METHODS:
This was a prospective, monocentric, evaluator-blinded, randomised (11) study with a parallel two-group design. Overall, 31 individuals with voluntary chronic heart failure (CHF) (left ventricular ejection fraction [LVEF]<45%) were allocated to MICT (n=15) or HIIT (n=16) for a short rehabilitation program (mean [SD] 27 [4] days). Participants underwent 24-hr electrocardiography, echocardiography and a cardiopulmonary exercise test at entry and at the end of the study.RESULTS:
High-frequency power in normalized units (HFnu%) measured as HRV increased with HIIT (from 21.2% to 26.4%, P<0.001) but remained unchanged with MICT (from 23.1% to 21.9%, P=0.444, with a significant intergroup difference, P=0.003). Resting heart rate (24-hr Holter electrocardiography) decreased significantly for both groups (from 68.2 to 64.6 bpm and 66.0 to 63.5 bpm for MICT and HIIT, respectively, with no intergroup difference, P=0.578). The 2 groups did not differ in premature ventricular contractions. Improvement in peak oxygen uptake was greater with HIIT than MICT (+21% vs. +5%, P=0.009). LVEF improved with only HIIT (from 36.2% to 39.5%, P=0.034).CONCLUSIONS:
In this short rehabilitation program, HIIT was significantly superior to the classical MICT program for enhancing parasympathetic tone and peak oxygen uptake. CLINICALTRIALS. GOV IDENTIFIER NCT03603743.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ejercicio Físico
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Rehabilitación Cardiaca
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Entrenamiento de Intervalos de Alta Intensidad
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Insuficiencia Cardíaca
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Frecuencia Cardíaca
Tipo de estudio:
Clinical_trials
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Observational_studies
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Risk_factors_studies
Límite:
Aged
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Ann Phys Rehabil Med
Asunto de la revista:
MEDICINA FISICA
/
REABILITACAO
Año:
2019
Tipo del documento:
Article