Exposure to bright light during evening class hours increases alertness among working college students

Autor(es)

Teixeira, Liliane ^[1] ; Lowden, Arne ^[2] ; da Luz, Andrea Aparecida ^[3] ; Turte, Samantha Lemos ^[3] ; Moreno, Claudia Roberta ^[3] ; Valente, Daniel ^[1] ; Nagai-Manelli, Roberta ^[3] ; Louzada, Fernando Mazzilli ^[4] ; Fischer, Frida Marina ^[3]

Afiliação do(s) autor(es)

^[1] Fiocruz MS, Natl Sch Publ Hlth, BR-21041210 Rio De Janeiro, RJ - Brazil

^[2] Stockholm Univ, Stress Res Inst, SE-10691 Stockholm - Sweden

^[3] Univ Sao Paulo, Dept Environm Hlth, BR-01246904 Sao Paulo - Brazil

^[4] Univ Fed Parana, Dept Physiol, Curitiba, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Sleep Medicine; v. 14, n. 1, p. 91-97, JAN 2013.
• Citações Web of Science: 6

Resumo

Objective: To evaluate the effects of exposure to bright light on sleepiness during evening hours among college students. Methods: Twenty-seven healthy college students, all males, with ages ranging from 21 to 24 years, working during the day and studying in the evening, participated in this study. During the 3 week study, the students wore actigraphs and recorded levels of sleepiness. In a crossover design, on the second and third weeks, the students were exposed to bright light (BL) at either 19:00 or 21:00 h. Salivary melatonin samples were collected before and after BL exposure. ANOVA test for repeated measurements were performed. Results: After BL exposure, sleepiness levels were reduced at 20:30 and 22:00 h (F = 2.2; p < 0.05). ANOVA showed statistical differences between time (F = 4.84; p = 0.04) and between day and time of BL exposure (F = 4.24; p = 0.05). The results showed effects of melatonin onset at 20:00 and 21:30 h and sleepiness levels (F = 7.67; p = 0.02) and perception of sleepiness and intervention time (F = 6.52; p = 0.01). Conclusion: Controlled exposure to BL during evening hours increased alertness among college students. The effects of BL on sleepiness varied according to the time of melatonin onset. (C) 2012 Elsevier B. V. All rights reserved. (AU)

• Processo FAPESP: 07/04648-4 - Jovens universitários e as jornadas duplas de trabalho: repercussões na saúde e na qualidade de vida
• Beneficiário: Frida Marina Fischer
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/59053-2 - Avaliação da proposta de intervenção para redução da sonolência entre universitários trabalhadores
• Beneficiário: Liliane Reis Teixeira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado