PEDIATRICS Vol. 46 No. 1 July 1970, pp. 28-35
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REFLEX-ARC LATENCY MEASUREMENTS IN NEWBORN INFANTS AND CHILDREN

Marvin A. Eisengart M.D.1

1 Behavioral Biology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland

Measurements of biceps reflex latency were made in newborn infants, older infants, and children at the National Naval Medical Center and in infants and children at a child and youth clinic in the District of Columbia. Relating reflex latency to a standard skeletal measure, an average "reflex velocity" was calculated which reliably reflects the maturational changes reported for motor nerve conduction velocity.

In newborn infants reflex velocity was found to be more closely related to gestational age than to birth weight.

There were no differences found in the absolute values or rates of maturation of reflex velocity among the children in the two clinic populations.

Submitted on December 5, 1969
Accepted on February 10, 1970