A36 SLEEP, Volume 40, Abstract Supplement, 2017 A. Basic Sleep Science III. Physiology 0095 THE EFFECTS OF EVENING ELECTRONIC DEVICE USE ON SLEEP IN HIGHLY TRAINED ATHLETES Jones M 1 , Peeling P 1 , Dawson B 1 , Halson S 2 , Miller J 2 , Dunican I 1 , Clarke M 1 , Goodman C 3 , Eastwood P 1 1 The University of Western Australia, Crawley, AUSTRALIA, 2 Australian Institute of Sport, Bruce, AUSTRALIA, 3 Western Australian Institute of Sport, Mount Claremont, AUSTRALIA Introduction: Sleep is considered one of the most important compo- nents of recovery for athletes, and sleep optimisation may assist athletes in achieving peak performance. Currently, it is thought that sleep quality and quantity are negatively affected by electronic device use (e.g. laptops, smartphones, televisions), but the mechanism underlying this relation- ship is unclear. This study aimed to investigate the influence of different types of tasks (i.e. puzzles vs. reading) performed with or without an electronic device (tablet) on pre-sleep alertness and sleep quality. Methods: Eight highly-trained netball players attended a sleep labo- ratory for pre-sleep testing and polysomnographic sleep monitoring on five separate occasions (1 familiarisation and 4 experimental sessions), each conducted at least one week apart. During the 2 h prior to bedtime in each experimental session, athletes completed cognitively stimu- lating tasks (puzzles) or passive tasks (reading) administered with or without an electronic device (tablet). The order of task administration was randomised. Sleep measures were obtained from polysomnogra- phy and questionnaires; melatonin concentration was measured via saliva samples. Sleep measures were compared using repeated meas- ures ANOVA. Effect sizes were calculated using Cohen’s d statistic. Results: The increase in melatonin concentration was significantly greater after reading compared to completing puzzles on a tablet (p=0.02), but was not different between any other conditions. A moderate-large effect size indicated that perceived sleepiness tended to be greater after reading compared to completing puzzles without a tablet (d=0.80), but not with a tablet. There were no significant differences in sleep duration, sleep onset latency, wake after sleep onset, sleep efficiency or percentage of time spent in each stage of sleep between any of the conditions. Conclusion: These data suggest that using a tablet for 2 h prior to sleep does not negatively affect subsequent sleep in athletes. Further research is required to better understand the relationship between evening electronic device use and sleep. Support (If Any): 0096 TEMPORAL VARIATION OF TRANSPORTATION NOISE DURING SLEEP IMPACTS ON GLUCOSE METABOLISM Thiesse L 1 , Rudzik F 1 , Pieren R 2 , Wunderli JM 2 , Spiegel K 3 , Leproult R 4 , Vienneau D 5 , Brink M 6 , Probst-Hensch N 5 , Röösli M 5 , Cajochen C 1 1 Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERLAND, 2 Empa - Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, SWITZERLAND, 3 INSERM U1028 - UMR 5292, Lyon Neuroscience Research Center (CRNL), Team “Integrated Physiology of the Brain Arousal System”, Lyon, FRANCE, 4 UNI-ULB Neuroscience Institute, Université Libre de Bruxelles (ULB), avenue F.D. Roosevelt 50, Bruxelles, BELGIUM, 5 Swiss Tropical and Public Health Institute, Basel, SWITZERLAND, 6 Swiss Federal Office for the Environment, Dept. Noise and Non-ionizing Radiation, Bern, SWITZERLAND Introduction: Intermittency ratio (IR) has been proposed as a new metric to reflect the effects of transportation noise exposure on health. IR takes the frequency distribution of events into account. Since nocturnal transportation noise has been linked to higher risk of inci- dent type 2 diabetes, we investigated the short-term effect of IR during sleep on glucose metabolism. Methods: Twenty-three young volunteers (age: 19-33y; BMI: 18.5– 25; 11 females) participated in a six-day laboratory study starting with a noise-free baseline night (BL) followed by four nights with night-time noise scenarios (NN2-NN5) differing in IR (LowIR: distant highway, dense traffic vs. HighIR: short distance, residential street or railway line) with a constant hourly Leq of 45 dB(A) at the ear of the sleeper. The study ended with a noise-free recovery night (RC). Carbohydrate metabolism was assessed during an oral glucose tolerance test con- ducted upon awakening in the mornings of BL, NN5 and RC. Results: Post-charge glucose levels (AUCglc) increased after four nights of nocturnal transportation noise compared to BL (+12 ± 3%; p=0.004 for LowIR on NN5 (LowIR_NN5) and +16 ± 3%; p=0.0003 for HighIR on NN5 (HighIR_NN5)). After one recovery night AUCglc returned to baseline levels in the case of LowIR_NN5, while it stayed higher for HighIR_NN5 (BL-RC: p=0.0004). Sleep macrostructure did not significantly change across the noise nights compared to BL. However, the percentage increase in arousals was 31 ± 12% (p<0.036) for the HighIR_NN5 and only 7 ± 8% (NS) for the LowIR_NN5 com- pared to BL. Conclusion: Four nights of nocturnal traffic noise impaired glucose tolerance in lean young volunteers - an effect that disappeared after one recovery night in the LowIR but not in the HighIR condition. In addition, sleep was more fragmented in the HighIR compared to the LowIR condition. Thus, short-term effect of nocturnal HighIR noise is more deleterious for sleep and glucose metabolism than LowIR. Support (If Any): 0097 SPINDLE DENSITY PREDICTS AROUSABILITY FROM ACOUSTIC STIMULATION DURING SLEEP Rudzik F 1 , Thiesse L 1 , Pieren R 2 , Wunderli JM 2 , Brink M 3 , Vienneau D 4 , Probst-Hensch N 4 , Röösli M 4 , Cajochen C 1 1 Psychiatric Hospital of the University of Basel, Basel, SWITZERLAND, 2 Empa Laboratory for Acoustics/Noise Control, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, SWITZERLAND, 3 Swiss Federal Office for the Environment, Dept. Noise and Non-ionizing Radiation, Bern, SWITZERLAND, 4 Swiss Tropical and Public Health Institute, Basel, SWITZERLAND Introduction: Nocturnal transportation noise can disturb sleep by causing awakenings, sleep-stage changes or EEG arousals. However, not all external acoustic stimuli disrupt sleep. Processing of stimuli is modulated by transient EEG rhythms during sleep such as sleep spin- dles where sensory relay is hindered at a sub-cortical level. Thus, we investigated whether sleep spindle density rhythms predict arousability from acoustic stimulation (noise) during sleep. Methods: Twenty-six healthy participants (age: 19-33y, 12 female) were exposed to 80 railway noise events (RNE) that were played back in regular intervals during an 8-h night. For this, ten pre-recorded noise events were used, that differed with respect to maximum sound pres- sure level (SPL), event duration (SPL above 35 dB(A)), and slope of the SPL. Polysomnography and SPL of the noise events were recorded simultaneously during the night. Sleep and EEG arousals were scored according to standard criteria. Spindles on central channels were detected in EEG arousal and artefact free parts of sleep (NREM stages 1, 2 and 3) using an automatic scoring algorithm (http://spisop.org). Single RNE’s that occurred during stage 2 sleep were post-hoc clas- sified as Non-arousal or Arousal trials depending on whether an EEG arousal occurred during the particular event duration. Downloaded from https://academic.oup.com/sleep/article/40/suppl_1/A36/3780994 by guest on 13 June 2022