| 1. |
- Berglind, Daniel, et al.
(författare)
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The influence of the COVID-19 pandemic on physical activity in Stockholm County : Evidence from time series models of smartphone measured daily steps data spanning over 3 years
- 2024
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Ingår i: Preventive Medicine. - : Elsevier Inc. - 1096-0260 .- 0091-7435. ; 183
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Tidskriftsartikel (refereegranskat)abstract
- It has been reported that physical activity levels decreased during the COVID-19 pandemic. Previous studies often relied on self-reported physical activity, which has low accuracy. Studies based on objectively measured physical activity have had short data collection periods, thereby not allowing the consideration of pre-pandemic levels of physical activity or the influence over the different waves of the pandemic. In this study, we utilize smartphone-measured step data from a nonprobability sample in Stockholm County, Sweden, where measures to limit the spread of COVID-19 differed from those in many other countries. The results are based on 522 individuals and 532,739 person-days with step data spanning from 2019 to 2021. Generalized additive models were fitted for each individual, and meta-regression was used to combine the results from individual models. Daily steps decreased during the first wave but increased during the third wave compared to individual pre-pandemic levels. The decrease in daily steps occurred primarily in young individuals and those with occupations allowing remote work. Individuals of retirement age on the contrary increased their daily steps during the same period. This study reveal that the influence of the COVID-19 pandemic was temporary and that younger age and the possibility of working from home were associated with a decreasing trend in physical activity. •Using mobile phone derived daily steps data over three years.•Negative influence of Covid-19-pandemic on walking steps only exists during the early stage of the pandemic.•Being younger and having the possibility of working from home are associated with fewer steps per day.•Individual modeling with meta-analysis is an ideal method for large scale physical activity studies.
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| 2. |
- Gudjonsdottir, Hrafnhildur, et al.
(författare)
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Cohort Profile : The Stockholm Diabetes Prevention Programme (SDPP)
- 2022
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Ingår i: International Journal of Epidemiology. - : Oxford University Press (OUP). - 0300-5771 .- 1464-3685. ; 51:6, s. e401-e413
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Tidskriftsartikel (refereegranskat)abstract
- The Stockholm Diabetes Prevention Programme (SDPP) was established in the mid-1990s as a baseline for a community-based intervention aimed at primary prevention of type 2 diabetes (T2D). The intervention was found to be ineffective, but the cohort continues to contribute to our understanding of the pathogenesis of T2D and cardiometabolic risk factors.The cohort comprises 15 070 men and 19 416 women, born between 1938 and 1961, resident in five municipalities in Stockholm County, Sweden, at baseline. A sub-cohort answered a screening survey (10 236 men and 16 481 women), and a sub-cohort of those participated in a clinical examination (3128 men and 4821 women) at baseline (clinical cohort).The clinical cohort has been followed up after 10 years, when 2383 men and 3329 women participated, and after 20 years, when 1752 men and 2545 women participated.Socioeconomic, demographic and health-related register information was collected for all. The screening survey contains self-reported information on own and familial T2D. For the clinical cohort, we conducted oral glucose tolerance tests, drew blood and took blood pressures and anthropometric measurements. The participants also filled in questionnaires on lifestyle and psychosocial conditions.Data are available on request after ethical approval; information is available on the study webpage [Stockholm-Diabetes-Prevention-Programme-(SDPP)(regionstockholm.se)].
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| 3. |
- Xing, Liu, et al.
(författare)
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Octave-spanning supercontinuum generation in a silicon-rich nitride waveguide
- 2016
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Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 41:12, s. 2719-2722
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally show octave-spanning supercontinuum generation in a nonstoichiometric silicon-rich nitride waveguide when pumped by femtosecond pulses from an erbium fiber laser. The pulse energy and bandwidth are comparable to results achieved in stoichiometric silicon nitride waveguides, but our material platform is simpler to manufacture. We also observe wave-breaking supercontinuum generation by using orthogonal pumping in the same waveguide. Additional analysis reveals that the waveguide height is a powerful tuning parameter for generating mid-infrared dispersive waves while keeping the pump in the telecom band.
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