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Official Journal of the Italian Sports Medicine Federation
Indexed/Abstracted in: BIOSIS Previews, EMBASE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 0,163
Online ISSN 1827-1863
Krivolapchuk I. A.
Department of Physiology of Muscular Activity and Physical Training, Institute of Developmental Physiology, Russian Academy of Education, Moscow, Russia
AIM: Aim of this study was to assess the variation in rates of growth in height and development of body organs and systems across different age periods
METHODS: This study compared anthropometric characteristics and fitness performance data in a group (N.=123) of preschool boys and girls. The physical working capacity of preschool children at this age is determined by five major factors. Sex-related differences in some parameters reflect the physical working capacity and fitness characterizing the anaerobic alactic and anaerobic glycolytic productivity of the body.
RESULTS: The girls outperformed the boys for time of retention “hold to failure” at 4 W/kg (38.89±2.30 vs. 31.18±2.77 s; P<0.05), W40 (3.87±0.11 vs. 3.53±0.12 W/kg; P<0.05), the number of torso raising a minute (22.77±1.38 vs. 18.65±1.43 times/min; p<0.05), general physical fitness score (12.81±0.20 vs. 12.17±0.24; P<0.05); the coefficient of Muller’s equation «a» (2.07±0.07 vs. 2.35±0.11 a.u.; P<0.05) and the pulse debt accumulation rate after tension at submaximum power (2.17±0.06 vs. 2.41±0.09 bps; P<0.05) were lower for the girls. These differences are apparently related to an advanced development of anaerobic energy-supply mechanisms in girls as compared to age-matched boys. Analysis of physical development and central hemodynamics showed that the girls surpassed the boys in body length (111.8±0.6 vs. 110.1±0.6 sm; P<0.05), systolic blood pressure (92.3±0.90 vs. 89.1±1.3 mmHg; P<0.05), diastolic blood pressure (60.7±0.90 vs. 56.2±1.1 mmHg; P<0.01), blood pressure average (72.3±0.8 vs. 67.2±1.1 mmHg; P<0.001).
CONCLUSION: The higher blood pressure correlated with a more advanced somatic maturity in the girls, as well as the ratios of their physical growth at this stage of development.
language: English, Italian