In recent years, the relationship between healthy life expectancy and exercise has been shown, and the same is also reported for the disabilities. However, we have not yet found any reports on the effects of exercise in children with lower extremity amputations. In this study, we had followed a seven-year-old boy who had undergone right knee rotationplasty for the Ewing's sarcoma, and studied the changes in his athletic abilities, bone density, and body composition with the use of a running-specific prosthesis (RSP). After becoming independent on walking with a daily-use prosthesis, he started using the RSP during exercise such as running. We measured the above parameters before the introduction of RSP, then again after one year use of the RSP. The results showed positive changes in all measurements: increased motor strength around hip, longer time on one leg standing test, increased one leg jump, faster walking speed, wider stride, improved bone density, and improved body compositions. The use of RSP's along with daily-use prostheses for children in their growth period may have favorable effects on their athletic abilities, bone densities, and body compositions.

In recent years, the relationship between healthy life expectancy and exercise has been shown, and the same is also reported for the disabilities. However, we have not yet found any reports on the effects of exercise in children with lower extremity amputations. In this study, we had followed a seven-year-old boy who had undergone right knee rotationplasty for the Ewing's sarcoma, and studied the changes in his athletic abilities, bone density, and body composition with the use of a running-specific prosthesis (RSP). After becoming independent on walking with a daily-use prosthesis, he started using the RSP during exercise such as running. We measured the above parameters before the introduction of RSP, then again after one year use of the RSP. The results showed positive changes in all measurements: increased motor strength around hip, longer time on one leg standing test, increased one leg jump, faster walking speed, wider stride, improved bone density, and improved body compositions. The use of RSP's along with daily-use prostheses for children in their growth period may have favorable effects on their athletic abilities, bone densities, and body compositions.

BACKGROUND: Pyrethroid (PYR) insecticides are widely used for controlling various pests. There are two types that differ in terms of usage: agricultural-purpose PYR (agriculture-PYR) and hygiene purpose PYR (hygiene-PYRs). Few studies exist on the exposure to these chemicals in small children. In this study, we conducted biomonitoring of urinary pyrethroid metabolites in 1.5-year-old children throughout the year. METHODS: Study subjects were 1075 children participating in an Aichi regional sub-cohort of the Japan Environment and Children's Study as of 18-month health check-up. The concentrations of four specific hygiene-PYR metabolites including 2,3,5,6-tetrafluoro-1,4-benzenedimethanol (HOCH₂-FB-Al), and five common metabolites of hygiene- and agriculture-PYRs including 3-phenoxybenzoic acid (3PBA) and cis- and trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acid (DCCA), were measured in urine samples extracted from soiled diapers using a triple quadrupole gas chromatograph-mass spectrometer. RESULTS: The highest detection frequencies were for 3PBA, followed by DCCA, 1R-trans-chrysanthemum dicarboxylic acid, and HOCH₂-FB-Al. Among the six metabolites, urinary concentrations were seasonally varied. However, this variation was not observed in the most studied PYR metabolite, 3PBA. Spearman's correlation analysis demonstrated a significant positive correlation between FB-Al and DCCA (r = 0.56) and HOCH₂-FB-Al and 4-methoxymethyl-2,3,5,6-tetrafluorobenzyl alcohol (r = 0.60). CONCLUSIONS This biomonitoring survey found widespread and seasonally specific exposure to multiple hygiene- and agriculture-PYRs in 1.5-year-old Japanese children.
Agriculture ; Child, Preschool ; Environmental Exposure/analysis* ; Humans ; Infant ; Insecticides ; Japan ; Mass Spectrometry ; Pyrethrins/urine*