Assisted Physical Exercise and Stress in Preterm Neonates

ABSTRACT

Objective: To evaluate the markers of stress before and after a session of assisted physicalexercise in infants born before 35 weeks’ gestation. Methods: 25 infants born at 280/7 to 346/7weeks were subjected to assisted physical exercise daily for about 10-15 min at one week ofpostnatal age or 33 weeks of post menstrual age, whichever was later. Primary outcome wassalivary cortisol and secondary outcome was Premature infant pain profile (PIPP) score.Outcomes were measured, on day 5 (±1) of exercise. Results: There was no difference insalivary cortisol between baseline and immediately after (P=0.16), at 90 min (P=0.6) or 120min (P=0.7) after exercise. Salivary cortisol was lower at 30 min after exercise as compared tobaseline (mean difference -0.08 ?g/dL; 95% CI -0.16 to -0.002; P=0.04). The median (IQR)PIPP score was significantly higher at 5 min into exercise (4 (3-6) vs 4 (3-5); P=0.04) and atcompletion of exercise 6 (4-8) vs 4 (3-5); P<0.01), as compared to baseline. Conclusion:Assisted physical exercise does not seem to result in stress in premature infants