Autonomic Functioning in Young Adults Born at Extremely Low Birth Weight

Area of Science:

• Physiology
• Neonatology
• Cardiovascular Health

Background:

• Autonomic nervous system function is known to be affected in extremely low birth weight (ELBW) infants.
• Limited data exist on how these autonomic alterations persist into adulthood.

Purpose of the Study:

• To investigate the long-term effects of ELBW on adult autonomic functioning.
• To examine associations between birth weight and cardiovascular parameters in adulthood.

Main Methods:

• Compared 60 ELBW adults (ages 22-26) with 79 normal birth weight (NBW) controls.
• Assessed resting heart rate (R-R interval), high-frequency (HF) and low-frequency (LF) heart rate variability, and systolic (SBP) and diastolic (DBP) blood pressure.

Main Results:

• ELBW participants, particularly the smallest, exhibited significantly lower HF compared to NBW controls.
• Higher birth weight correlated positively with HF in both groups.
• In ELBW survivors, lower birth weight predicted faster heart rate and higher DBP, with poor coordination with baroreflex activity (LF).

Conclusions:

• Adult autonomic regulation may be significantly altered in individuals born extremely preterm.
• ELBW may have lasting impacts on cardiovascular control mechanisms into adulthood.