Abstract
Purpose
The long-term implications of premature birth on autonomic nervous system (ANS) function are unclear. Heart rate recovery (HRR) following maximal exercise is a simple tool to evaluate ANS function and is a strong predictor of cardiovascular disease. Our objective was to determine whether HRR is impaired in young adults born preterm (PYA).
Methods
Individuals born between 1989 and 1991 were recruited from the Newborn Lung Project, a prospectively followed cohort of subjects born preterm weighing < 1500 g with an average gestational age of 28 weeks. Age-matched term-born controls were recruited from the local population. HRR was measured for 2 min following maximal exercise testing on an upright cycle ergometer in normoxia and hypoxia, and maximal aerobic capacity (VO2max) was measured.
Results
Preterms had lower VO2max than controls (34.88 ± 5.24 v 46.15 ± 10.21 ml/kg/min, respectively, p < 0.05), and exhibited slower HRR compared to controls after 1 and 2 min of recovery in normoxia (absolute drop of 20 ± 4 v 31 ± 10 and 41 ± 7 v 54 ± 11 beats per minute (bpm), respectively, p < 0.01) and hypoxia (19 ± 5 v 26 ± 8 and 39 ± 7 v 49 ± 13 bpm, respectively, p < 0.05). After adjusting for VO2max, HRR remained slower in preterms at 1 and 2 min of recovery in normoxia (21 ± 2 v 30 ± 2 and 42 ± 3 v 52 ± 3 bpm, respectively, p < 0.05), but not hypoxia (19 ± 3 v 25 ± 2 and 40 ± 4 v 47 ± 3 bpm, respectively, p > 0.05).
Conclusions
Autonomic dysfunction as seen in this study has been associated with increased rates of cardiovascular disease in non-preterm populations, suggesting further study of the mechanisms of autonomic dysfunction after preterm birth.
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Abbreviations
- ANS:
-
Autonomic nervous system
- GPAQ:
-
Global Physical Activity Questionnaire
- HR:
-
Heart rate
- HRmax :
-
Maximal heart rate
- HRR:
-
Heart rate recovery
- MET:
-
Metabolic equivalent
- P max :
-
Maximal power
- T max :
-
Maximal time to exhaustion
- VO2max :
-
Maximal aerobic capacity
- VTVO2 :
-
Oxygen consumption per kg of body weight at ventilatory threshold
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Funding
National Institutes of Health: NIH-NHLBI R01-HL115061, NIH-NHLBI R01Supplement-HL1150613 (PI Eldridge), T32-HL 07936 (Haraldsdottir).
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KH, AMW, KNG, and MWE conceptualized and designed the study and are the guarantor of the content of the manuscript, including the data and analysis. KH, AMW, KNG, AGB, DFP, LHT, MDB, RMC, and MWE assisted with data collection. KH, AMW, KNG, AGB, MP, LHT, MDB, RMC, and MWE contributed to the analysis and interpretation of data. AMW conducted statistical analysis. KH and AMW prepared figures. KH drafted the initial manuscript. All authors reviewed, revised, and approved the final manuscript as submitted.
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Haraldsdottir, K., Watson, A.M., Beshish, A.G. et al. Heart rate recovery after maximal exercise is impaired in healthy young adults born preterm. Eur J Appl Physiol 119, 857–866 (2019). https://doi.org/10.1007/s00421-019-04075-z
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DOI: https://doi.org/10.1007/s00421-019-04075-z