Growth of schoolchildren with early, average and late ages of peak height velocity

Abstract

A sample of Swedish urban schoolchildren (357 girls, 373 boys) born in 1954/55 followed from 10 to 18 years were grouped according to peak height velocity age (PHV age) into early, average and late maturers. Mean heights differed between the maturity groups at ages from 10.0 to 14.0 years for girls and 10.5 to 17.0 years for boys. Mean weights differed between the maturity groups at all ages up to 16.0 years for girls and up to 18.0 years for boys. The earlier the maturity process, the heavier for given height. The time differences between peak weight velocity (PWV) and PHV significantly differed between early, average and late maturers amounting to 0.9, 0.5 and 0.2 years respectively for girls and 0.6, 0.3 and -0.1 years respectively for boys. The time difference between menarche and PWV did not differ between the maturity groups and amounted to about 0.6 +/- 0.05 years (SD = 0.9). For boys a similar lack of difference between maturity groups was obtained concerning the time difference between secondary sex characteristics; stage 4 (SSC IV) and PWV. Mean height and weight for girls and boys differed between the maturity groups at PHV but not at PWV, menarche or SCC IV.

Analysis of the velocity curve for height by the wavelet interpolation method in children classified by maturity rate

“…Thus, MPV during adolescence decreases gradually as the timing of MPV becomes later. Such tendency was also shown by Lindgren (1978), among others, who showed significant differences in respective mean velocities at PHV in early, average, and late maturers. (1-4) There exists a function (t) ʰ V 0 such that { (t − k) : k ʰ z} is an orthogonal basis of V 0 .…”

Pubertal development in obese children and adolescents

“…28,33 Longitudinal data on growth of Swedish schoolchildren showed that increased body weight was associated with earlier peak height velocity in both genders. 34 The gain of 1 unit of BMI between 2 and 8 years of age was associated with an average of 0.11 years earlier for peak height velocity. 35 There are only few studies, which have investigated the hormonal regulation of the acceleration of bone age in obese children.…”

Environmental Factors and Puberty Timing: Expert Panel Research Needs

“…[77][78][79][80][81][82][83][84] Similar findings are observed in boys as measured by growth spurt or genital and pubic hair maturation. 81,[85][86][87] Body size measures also have been associated with early puberty, 82,86,88 as have dietary and physical activity exposures and pubertal timing. 79,[89][90][91][92][93][94] Environmental exposure to persistent halogenated organic chemicals such as PCBs, dichlorodiphenyltrichloroethane/dichlorodiphenyldichloroethylene (DDT/DDE), and brominated flame retardants have been associated with pubertal alterations, as have dioxin, hexachlorobenzene (HCB), endosulfan, and heavy metals, but to a lesser extent ( Table 2).…”