La miopia nei giovani può essere associata a disturbi dei ritmi circadiani ed a una minore produzione di melatonina

Dal seguente studio, effettuato su giovani adulti, è risultato che le persone miopi avevano un ritardo significativo nell'inizio del sonno oltre che una durata più breve e una preferenza diurna di tipo più serale rispetto agli emmetropi. Questi risultati suggeriscono una potenziale associazione tra ritmi circadiani alterati e miopia negli esseri umani.

Abstract dello studio:

Myopia, or near-sightedness, is associated with delayed melatonin circadian timing and lower melatonin output in young adult humans.

Study objectives
Myopia, or near-sightedness, is the most common refractive vision disorder and predisposes the eye to many blinding conditions in adulthood. Recent research has suggested that myopia is associated with increased endogenous melatonin production. Here we investigated the differences in melatonin circadian timing and output in young adult myopes and non-myopes (or emmetropes) as a pathogenesis for myopia.

A total of 18 myopic (refractive error [mean ± standard deviation] −4.89 ± 2.16 dioptres) and 14 emmetropic participants (−0.09 ± 0.13 dioptres), aged 22.06 ± 2.35 years were recruited. Circadian timing was assessed using salivary dim light melatonin onset (DLMO), collected half-hourly for 7 h, beginning 5 h before and finishing 2 h after individual average sleep onset in a sleep laboratory. Total melatonin production was assessed via aMT6s levels from urine voids collected from 06:00 pm and until wake-up time the following morning. Objective measures of sleep timing were acquired a week prior to the sleep laboratory visit using an actigraphy device.

Myopes (22:19 ± 1.8 h) exhibited a DLMO phase-delay of 1 hr 12 min compared with emmetropes (21:07 ± 1.4 h), p = 0.026, d = 0.73. Urinary aMT6s melatonin levels were significantly lower among myopes (29.17 ± 18.67) than emmetropes (42.51 ± 23.97, p = 0.04, d = 0.63). Myopes also had a significant delay in sleep onset, greater sleep onset latency, shorter sleep duration, and more evening-type diurnal preference than emmetropes (all p < 0.05).

These findings suggest a potential association between circadian rhythms and myopia in humans.

Sleep, Volume 44, Issue 3, March 2021, zsaa208,
Published: 08 October 2020

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