Objective-To determine if massage therapy increased serum insulin and insulin-like growth factor 1 (IGF-1) in preterm neonates.Study Design-Forty-two preterm neonates who averaged 34.6 weeks (M=29.5 weeks gestational age; M birthweight= 1237 gms) and were in the "grower" (step-down) nursery were randomly assigned to a massage therapy group (body stroking and passive limb movements for three, 15-minute periods per day for 5 days) or a control group that received the standard nursery care without massage therapy. On days 1 and 5, the serum collected by clinical heelsticks was also assayed for insulin and insulin-like growth factor-1 (IGF-1), and weight gain and kilocalories consumed were recorded daily.Results-Despite similar formula intake, the massaged preterm neonates showed greater increases during the 5 day period in: 1) weight gain; 2) serum levels of insulin; and 3) insulin-like growth factor-1 (IGF-1). Increased weight gain was significantly correlated with insulin and IGF-1.Discussion-Previous data suggested that preterm infant weight gain following massage therapy related to increased vagal activity, which suggests decreased stress, and gastric motility, which may contribute to more efficient food absorption. The data from this study suggest for the first time that weight gain was also related to increased serum insulin and IGF-1 levels following massage therapy.
Conclusion-Preterminfants who received massage therapy not only showed greater weight gain but also a greater increase in serum insulin and IGF-1 levels, suggesting that massage therapy might be prescribed for all growing neonates.Reprint requests and correspondence should be addressed to Tiffany Field. Touch Research Institute, University of Miami School of Medicine, Department of Pediatrics (D-820), P.O. Box 016820, Miami, Florida 33101; office telephone: (305) 243-6781; Fax: (305) 243-6488; E-mail: tfield@med.miami.edu. There are no prior publications or submissions with any overlapping information. This will not be submitted to any other journal while under consideration. There are no potential conflicts of interest, real or perceived; the study sponsors had no role in the study design, the collection, analysis, and interpretation of data; the writing of the report; and the decision to submit the paper for publication. Tiffany Field wrote the first draft of the manuscript and no honorarium, grant, or other form of payment was given to anyone to produce the manuscript. Each author listed on the manuscript has seen and approved the submission of this version of the manuscript and takes full responsibility for the manuscript. Massage therapy has consistently led to greater weight gain in preterm neonates (Means range from 28% to 47%), earlier discharge (M=6 days), and a substantial reduction in hospital costs. 1-4 In addition, massaged preterm neonates show more mature motor behavior, more stable state organization, and fewer abnormal reflexes on the Brazelton Neonatal Behavioral Assessment Scale. 2,3 A recent study on potential underly...