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Dr. Hsu Li Yang, Dr. Tan Thuan Tong, Dr. Andrea Kwa, 08 Jan 2021
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Screen time, physical activity affect sleep in teens

06 Dec 2020

Among adolescents, less screen time and more physical activity may help promote more stable sleep, a recent study has found.

Wrist accelerometers were given to 247 teenagers (mean age, 15.8±0.3 years; 144 girls) to measure their sleep and activity patterns over 1 week. Screen time was self-reported through a seven-point Likert scale. At baseline, the mean body mass index (BMI) and body fat percentage were 21.9±3.0 kg/m2 and 25.0 percent, respectively.

Participants logged an average of 2,043±471 cpm/day of physical activity, which tended to be higher during school days. The average screen time was 5.6±2.3 hours per day and was higher during non-school days, such as weekends or holidays. Girls tended to have lower overall screen time and higher levels of physical activity than boys.

Screen time had a significantly negative impact on sleep, leading to later bedtime (p=0.03) and shorter rest (p=0.02) and sleep (p=0.047) durations. Each additional hour of screen time pushed bedtime back by 0.12 minutes and cut rest and sleep duration by 2.8 and 2.2 minutes, respectively.

Physical activity likewise reduced sleep and rest durations (p<0.0001 for both) and was linked to an earlier rise time (p=0.0003), while simultaneously decreasing awakenings during the night (p=0.0002).

Adjusted linear regression analysis further showed that screen time was significantly related to night-to-night variations in sleep parameters, particularly total sleep (p=0.001) and rest (p=0.001) time, bedtime (p<0.001), and rise time (p=0.03). Analysis according to sex found that all of these were driven by boys and none of the interactions were significant in girls.

Physical activity also correlated with sleep variability in terms of number of awakenings (p<0.001) and rise time (p=0.013), with such interactions observed in both boys and girls.

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Most Read Articles
01 Dec 2020
Tetanus toxoid 5 Lf, diphtheria toxoid 2 Lf, pertussis toxoid 2.5 mcg, filamentous haemagglutinin 5 mcg, fimbriae types 2 and 3 5 mcg, pertactin 3 mcg
Dr. Hsu Li Yang, Dr. Tan Thuan Tong, Dr. Andrea Kwa, 08 Jan 2021
Antimicrobial resistance has become increasingly dire as the rapid emergence of drug resistance, especially gram-negative pathogens, has outpaced the development of new antibiotics. At a recent virtual symposium, Dr Hsu Li Yang, Vice Dean (Global Health) and Programme Leader (Infectious Diseases), NUS Saw Swee Hock School of Public Health, presented epidemiological data on multidrug-resistant (MDR) gram-negative bacteria (GNB) in Asia, while Dr Tan Thuan Tong, Head and Senior Consultant, Department of Infectious Diseases, Singapore General Hospital (SGH), focused on the role of ceftazidime-avibactam in MDR GNB infections. Dr Andrea Kwa, Assistant Director of Research, Department of Pharmacy, SGH, joined the panel in an interactive fireside chat, to discuss challenges, practical considerations, and solutions in MDR gram-negative infections. This Pfizer-sponsored symposium was chaired by Dr Ng Shin Yi, Head and Senior Consultant of Surgical Intensive Care, SGH.
Jairia Dela Cruz, 4 days ago
Spending too much time sitting cannot be good for the body, and rising to one's feet breaks up such a behaviour and yields small, but meaningful, reductions in certain cardiovascular disease (CVD) risk factors, according to the results of a meta-analysis.
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