A similar trend was noted in infants with low baseline HF below the median, though the increase in HF during KMC did not reach statistical significance ( p = 0.07, Fig. 1c ).
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Impact of Kangaroo mother care on autonomic cardiovascular control in foetal-growth-restricted preterm infants.
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28 , 49 In our study, infants with lower baseline HF showed a trend of higher HF during KMC, similar to a previous study which suggested that these infants with low baseline HF were less comfortable prior to KMC. 31 The higher HF during KMC may be due to activation of pressure receptors that can increase parasympathetic activities, as HF and vagal tone in preterm infants were also increased by massage therapies 56 , 57 and hand containment together with maternal voice. 58 Infants with high baseline HRV showed reduced HRV during KMC On the other hand, infants with high baseline LF or HF had decreased HRV during KMC.