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We analyzed the effects of wearing blue lenses on melatonin level, physical andcognitive performance. Fifteen youth volleyball players(15.0±1.5 yrs) attended the laboratory on 3 occasions (48-hinterval): on the 1st visit they were familiarized with theprocedures of the study, and on 2nd and 3rd visits theywere submitted to the testing protocol wearing transparent (control) or bluelens glasses in a counterbalanced crossover design. The protocol consisted of10 min in “total darkness,” 30 min of lightstimulation (wearing blue or transparent lenses), followed by an attentionaltest, and an agility T-test (without wearing the glasses). Samples of saliva (todetermine melatonin concentration) were obtained pre- and post-exposure(30 min) to artificial light, wearing the lenses. Sleepiness, alertness,attention, mood, and perceived recovery status and performance variables(reaction time and T-test) were assessed after lens exposure. Melatonin levelsdid not differ within and between groups (blue lenses, pre: 0.79±0.73and post: 1.19±1.374 pg/dl, p=0.252, effect size(ES)=0.38; control, pre: 0.97±1.00 and post:0.67±0.71 pg/dl, p=0.305,ES=–0.35). Nonetheless, melatonin differences were significantlycorrelated with physical sedation for glasses with blue lenses(r=−0.526; p=0.04). No other variables differed(p&gt;0.05) between protocols, including T-test performance(p=0.07; ES=0.41). Blue lenses do not influence melatoninlevels, cognitive/physical performance, and mood status in amateur youthvolleyball players.

Influence of Wearing Blue Lenses on Melatonin Production and Performance in Volleyball Players