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Link to original content: http://pubmed.ncbi.nlm.nih.gov/35211651/
Influence of Wearing Blue Lenses on Melatonin Production and Performance in Volleyball Players - PubMed Skip to main page content
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. 2022 Feb 21;6(1):E1-E8.
doi: 10.1055/a-1720-6083. eCollection 2022 Jan.

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

Eduardo Baptista  1 , Rhai André Arriel  1 , Ana Luiza de Castro Carvalho  1 , Matheus M C Bispo  1 , Alex Batista Rodrigues  1 , Hiago Souza  1 , Gustavo R Mota  2 , Moacir Marocolo  1
Affiliations

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

Eduardo Baptista et al. Sports Med Int Open. .

Abstract

We analyzed the effects of wearing blue lenses on melatonin level, physical and cognitive performance. Fifteen youth volleyball players (15.0±1.5 yrs) attended the laboratory on 3 occasions (48-h interval): on the 1 st visit they were familiarized with the procedures of the study, and on 2 nd and 3 rd visits they were submitted to the testing protocol wearing transparent (control) or blue lens glasses in a counterbalanced crossover design. The protocol consisted of 10 min in "total darkness," 30 min of light stimulation (wearing blue or transparent lenses), followed by an attentional test, and an agility T-test (without wearing the glasses). Samples of saliva (to determine 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 levels did not differ within and between groups (blue lenses, pre: 0.79±0.73 and 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 significantly correlated with physical sedation for glasses with blue lenses (r=-0.526; p=0.04). No other variables differed (p>0.05) between protocols, including T-test performance (p=0.07; ES=0.41). Blue lenses do not influence melatonin levels, cognitive/physical performance, and mood status in amateur youth volleyball players.

Keywords: attention; physical functional performance; psychomotor performance.

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Conflict of interest statement

Conflict of Interest The authors declare that they have no conflict of interest.

Figures

Fig. 1
Fig. 1
Experimental Design of the Study.
Fig. 2
Fig. 2
Blue Safety Glasses.
Fig. 3
Fig. 3
Melatonin responses before and after exposure of the blue and transparent lenses. Data are expressed as individual values±SD.
Fig. 4
Fig. 4
a , Accuracy results (p=0.308, ES=–0.47); b , Reaction time (p=0.698, ES=–0.14); c , T-test (P=0.066; ES=0.41). Data are expressed as individual values±SD.
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