Late-night cinema watching did not affect cortisol awakening response and heart rate variability in the next morning

Abstract

Objective Effect of watching a screen late in the night on the hypothalamo-pituitary-adrenal axis (HPA) and autonomous nervous system (ANS) activity in the next morning is not known. Aim of the current study was, therefore, to measure effects of late-night cinema watching on sleep quality, cortisol awakening response (CAR) as an indicator of HPA and heart rate variability (HRV) as an indicator of ANS activity. Material-Method Medical students (n=22, 20-26 year-old) were followed for two consecutive days: a control day followed by a cinema watching day. In each day, sleep dairies were filled; salivary samples were taken at 0, 15, 30 and 60 min post-awakening for measurement of CAR; and electrocardiogram was recorded for 5 min for determination of HRV. A film lasting 140 min, ‘Fast and Furious 7’, was watched altogether at the last 09:00 p.m session. Results Late-night cinema watching did not affect CAR (mean, area under the curve) and sleep parameters (time, duration, disturbed sleep, awakening problems) and time- and frequency-domain parameters of HRV (p>0.05). Conclusion The results suggest that late-night cinema watching does not affect HPA and ANS activities in the next morning if the person is accustomed to sleeping late in the night. Additionally, it might be speculated that watching a film with a groups of friends is an entertaining activity counteracting the negative effects of late-night sleeping.

Keywords

• Late night cinema
• cortisol awakening response
• heart rate variability

Gece Geç Saatlerde Sinema Izlemek, Ertesi Sabah Kortizol Uyanma Yanıtı Ve Kalp Hızı Değişkenliğini Etkilemedi

Öz

Amaç: Gece geç saatlerde ekran (sinema) seyretmenin, ertesi gün hipotalamus-hipofiz-adrenal aks (HPA) ve otonom sinir sistemi
(OSS) aktivitesi üzerine etkileri bilinmiyor. Bu nedenle, mevcut çalışmanın amacı, uyku kalitesi, OSS aktivitesinin belirteci olan kalp
hızı değişkenliği (KHD) ve HPA aksının belirteci olan kortizol uyanma yanıtı (KUY) üzerine gece geç saatlerde sinema izlemenin
etkilerini incelemekti.
Materyal Metod: Bu çalışmada Tıp Fakültesi öğrencileri (n=22), biri kontrol günü ve takiben sinema izleme günü olmak üzere iki
ardışık gün takip edildi. Her gün, uyku ölçekleri dolduruldu; KUY ölçümü için uyandıktan sonra 0, 15, 30 ve 60. dakikalarda tükürük
örnekleri toplandı ve KHD belirlemek için 5 dakikalık EKG kaydı alındı. Sinema izleme günü, film olarak 140 dk süren “Hızlı ve Öfkeli
7” filmi saat 21:00 da hep birlikte izlendi.
Bulgular: Gece geç saatlerde sinema izlemek, zaman ve frekans bağımlı KHD parametrelerini, uyku parametrelerini (uyku zamanı,
süresi, uyku bozukluğu, uyanma problemleri) ve KUY (ortalama, eğri altında kalan alan) etkilemedi (p>0.05).
Sonuç: Sonuçlar, kişinin gece geç saatlerde uyumaya alışkın olması durumunda, gece geç saatlerde sinema izlemenin ertesi sabah
HPA ve OSS aktivitelerini etkilemediğini göstermektedir. Ek olarak, bir grup arkadaşıyla birlikte bir film izlemenin, gece geç saatlerde
uyumanın olumsuz etkilerine karşı koyan eğlenceli bir etkinlik olduğu düşünülebilir.

Anahtar Kelimeler

• Gece geç saatlerde sinema
• kortizol uyanma yanıtı (KUY)
• kalp hızı değişkenliği (KHD)

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