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Heart rate recovery after maximal exercise is impaired in healthy young adults born preterm

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European Journal of Applied Physiology Aims and scope Submit manuscript

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

References

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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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Authors and Affiliations

Authors

Contributions

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.

Corresponding author

Correspondence to Andrew M. Watson.

Additional information

Communicated by Massimo Pagani.

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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

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