Age-dependent association of exposure to television screen with children's urinary melatonin excretion?
OBJECTIVE
Changes in magnetic field are associated with a decrease in nocturnal urinary melatonin excretion. Television screens emit low and very low frequency electromagnetic waves (radiofrequencies and light) and exposure to them may be associated with a decrease in 24-hour melatonin in children's urine. Design and setting. An observational study in schools of Cavriglia, Italy, determined melatonin in 24-hour urines from 42 boys and 32 girls 6 to 13 years of age after one week of watching TV and after another week of abstaining from watching TV.
In a gender- and age-dependent fashion, exposure to a television screen was associated with lower urinary melatonin concentrations, affecting particularly younger children at a pubertal stage when important changes in melatonin's time structure occur.


CONCLUSIONS
Additional work should test further relations to growth, maturation and development, focusing on any adverse effect from exposure to a television screen also on obesity from a neuro-hormonal viewpoint, quite apart from any decreased activity and/or other lifestyle alterations associated with watching TV.
Salti
Roberto
R
Department of Pediatrics, University of Florence, Florence, Italy.
Tarquini
Roberto
R
Stagi
Stefano
S
Perfetto
Federico
F
Cornélissen
Germaine
G
Laffi
Giacomo
G
Mazzoccoli
Gianluigi
G
Halberg
Franz
F
D000293:Adolescent; D000375:Aging / Q000378:metabolism; D002648:Child; D004574:Electromagnetic Fields / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008297:Male; D008550:Melatonin / Q000652:urine*; D012727:Sex Characteristics; D013690:Television
D008550:Melatonin