Different limbs and limb sections show alternating periods of acceleration and retardation in individual growth curves¶

Claim · All claims
Evidence · 1 study · associational r1 · q1
Currency · newest study 1930 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q1 i? In the reported growth curves, when one limb or limb section increases relatively rapidly, other limbs or sections are retarded, having their acceleration at another time. → King 1930

Evidence¶

King 1930¶

King, Irving. (1930). Measurements of the Physical Growth of Two Children. The Journal of Educational Psychology. https://psycnet.apa.org/journal/edu

q1 · i? · associational · r1

Observation of the plotted percentage-increase curves for the two children (Charts I and II). The author reports "more or less acceleration" in parts such as the thigh of the oldest boy before creeping and walking, with apparent retardation of the same parts during development of that coordination. This is a visual pattern, hedged by the author.

"In the case of the oldest boy, especially, there appears to have been more or less acceleration in the growth of certain parts; e. g., of the thigh during the period preceding the development of creeping and walking, while there seemed to be a retardation of the same parts during the development of this co-ordination."

Discussion¶

Related Claims¶

• Regular physical measurements of two brothers were taken from birth for six years four months and three years four months — related
• Growth is not uniform but proceeds with variations in the limbs, trunk, and head, so gross measures require finer analysis — a broader claim this one bears on