Activity, cardiac and respiratory responses of blindfold preterm infants in a neonatal intensive care unit.

The purposes of the present study were to examine 24-h periods in the life of preterm infants incubated in a Neonatal Intensive Care Unit (NICU) using indices of activity, cardiac and respiratory responses, and to examine the effects of blindfolding incubated infants upon these behavioural indices. Ten healthy preterm infants were individually observed for 2 days a week for a 24-h period, using a continuous video recording system. Each infant was blindfolded with an eye-mask and a black head-cap for approximately equal to 10 h during a night out of the 2 days. Analyses on activity, cardiac and respiratory responses were done for (1) 20 min sampled from every other hour during the 2 days, and (2) for 1 h during the night, both a blindfolded day and unblindfolded, respectively. The results showed that activity was less and respiration rate lower when blindfolded than when unblindfolded. Respiration rate was also found to be stable when blindfolded.