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Physical activity, screen exposure and sleep among students during the pandemic of COVID-19.
Guo, YF, Liao, MQ, Cai, WL, Yu, XX, Li, SN, Ke, XY, Tan, SX, Luo, ZY, Cui, YF, Wang, Q, et al
Scientific reports. 2021;(1):8529
Abstract
This study aimed to determine the levels of health-related behaviours (physical activity, screen exposure and sleep status) among Chinese students from primary, secondary and high schools during the pandemic of COVID-19, as well as their changes compared with their status before the pandemic. A cross-sectional online survey of 10,933 students was conducted among 10 schools in Guangzhou, China, between 8th and 15th March, 2020. After getting the informed consent from student's caregivers, an online questionnaire was designed and used to obtain time spending on health-related behaviours during the pandemic of COVID-19, as well as the changes compared with 3 months before the pandemic, which was completed by students themselves or their caregivers. Students were stratified by regions (urban, suburban, exurban), gender (boys and girls), and grades (lower grades of primary school, higher grades of primary schools, secondary schools and high schools). Data were expressed as number and percentages and Chi-square test was used to analyse difference between groups. Overall, the response rate of questionnaire was 95.3% (10,416/10,933). The median age of included students was 13.0 (10.0, 16.0) years and 50.1% (n = 5,219) were boys. 41.4%, 53.6% and 53.7% of total students reported less than 15 min per day in light, moderate and vigorous activities and 58.7% (n = 6,113) reported decreased participation in physical activity compared with the time before pandemic. Over 5 h of screen time spending on online study was reported by 44.6% (n = 4,649) of respondents, particular among high school students (81.0%). 76.9% of students reported increased screen time compared with the time before pandemic. Inadequate sleep was identified among 38.5% of students and the proportion was highest in high school students (56.9%). Our study indicated that, during the COVID-19 pandemic, the school closure exerted tremendous negative effects on school-aged children's health habits, including less physical activity, longer screen exposure and irregular sleeping pattern.
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Effect of Tai Chi exercise on lower limb function and balance ability in patients with knee osteoarthritis: A protocol of a randomized controlled trial.
Zheng, H, Zhang, D, Zhu, Y, Wang, Q
Medicine. 2021;(46):e27647
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Abstract
BACKGROUND Knee osteoarthritis (KOA) is a chronic degenerative joint disease commonly occurring in middle-aged and elderly people. The main clinical manifestations are joint pain, limited activity, and decreased muscle strength resulting in decreased motor control ability. Exercise therapy is an effective method to enhance muscle strength of lower limbs, while China's traditional skill Tai Chi (TC) is a combination of activity and inertia, internal and external exercise therapy. In recent years, scholars at home and abroad have found that regular TC can effectively improve patients' lower limb function and balance ability. The purpose of this study is to explore the effects of TC on lower limb function and balance ability in patients with KOA. METHODS This is a prospective randomized controlled clinical trial. One hundred forty-six cases of KOA patients will be randomly divided into experimental group and control group according to 1:1 ratio, 73 cases in each group, the control group: sodium hyaluronate; experimental group: TC added on the basis of the control group. Both groups will receive standard treatment for 5 weeks and will be followed up for 3 months. Observation indicators include: the western Ontario and McMaster universities osteoarthritis index; hospital for special surgery knee score; balance stability index, liver and kidney function, adverse reaction rate, etc. SPSS 23.0 software will be used for data analysis. DISCUSSION This study will evaluate the effects of TC on lower limb function and balance ability of patients with KOA. The results of this trial will provide a clinical basis for the selection of exercise therapy for patients with KOA.
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Walking in the Light: How History of Physical Activity, Sunlight, and Vitamin D Account for Body Fat-A UK Biobank Study.
Klinedinst, BS, Meier, NF, Larsen, B, Wang, Y, Yu, S, Mochel, JP, Le, S, Wolf, T, Pollpeter, A, Pappas, C, et al
Obesity (Silver Spring, Md.). 2020;(8):1428-1437
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OBJECTIVE The high prevalence of vitamin D deficiency and obesity drives the need for successful strategies that elevate vitamin D levels, prevent adipogenesis, and stimulate lipolysis. This study provides a theoretical model to evaluate how physical activity (PA) and sunlight exposure influence serum vitamin D levels and regional adiposity. This study hypothesized a posteriori that sunlight is associated with undifferentiated visceral adiposity by increasing the ratio of brown to white adipose tissue. METHODS Using 10-year longitudinal data, accelerometry, a sun-exposure questionnaire, and regional adiposity quantified by dual-energy x-ray absorptiometry imaging, a structural-equation mediation model of growth curves was constructed with a data-driven methodology. RESULTS Sunlight and PA conjointly increased serum vitamin D. Changes in vitamin D levels partially mediated how sunlight and PA impacted adiposity in visceral and subcutaneous regions within a subjective PA model. In an objective PA model, vitamin D was a mediator for subcutaneous regions only. Interestingly, sunlight was associated with less adiposity in subcutaneous regions but greater adiposity in visceral regions. CONCLUSIONS Sunlight and PA may increase vitamin D levels. For the first time, this study characterizes a positive association between sunlight and visceral adiposity. Further investigation and experimentation are necessary to clarify the physiological role of sunlight exposure on adipose tissue.
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Long-term Effects of Moderate versus High Durations of Aerobic Exercise on Biomarkers of Breast Cancer Risk: Follow-up to a Randomized Controlled Trial.
Friedenreich, CM, Wang, Q, Yasui, Y, Stanczyk, FZ, Duha, A, Brenner, DR, Courneya, KS
Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology. 2019;(10):1725-1734
Abstract
BACKGROUND The optimal lifestyle for breast cancer prevention over the long term is unclear. We aimed to determine whether or not the amount of exercise prescribed in a year-long exercise intervention influences breast cancer biomarker levels 1 year later. METHODS We conducted a 24-month follow-up study (2012-2014) to the Breast Cancer and Exercise Trial in Alberta (BETA), a 12-month, two-armed (1:1), two-center randomized controlled trial of exercise in 400 cancer-free, postmenopausal women. The exercise prescription was moderate-vigorous aerobic exercise, 5 days/week (3 days/week supervised) for 30 minutes/session (MODERATE) or 60 minutes/session (HIGH). Participants were asked not to change their usual diet. We used linear mixed models to compare biomarker concentrations (C-reactive protein, insulin, glucose, HOMA-IR, estrone, sex hormone binding globulin, total estradiol, and free estradiol) over time (0, 12, and 24 months) by group (MODERATE, HIGH), using group-time interactions. RESULTS After 12 months of no intervention, 24-month fasting blood samples were available for 84.0% and 82.5% of MODERATE and HIGH groups, respectively (n = 333/400). We found no evidence that 0 to 24- or 12 to 24-month biomarker changes differed significantly between randomized groups (HIGH:MODERATE ratio of mean biomarker change ranged from 0.97 to 1.06, P values >0.05 for all). We found more favorable biomarker profiles among participants who experienced greater than the median fat loss during the trial. CONCLUSIONS Prescribing aerobic exercise for 300 versus 150 minutes/week for 12 months to inactive, postmenopausal women had no effects on longer-term biomarkers. IMPACT Exercise may lead to larger improvements in breast cancer biomarkers after intervention among women who also experience fat loss with exercise.
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Physical Activity and Survival After Prostate Cancer.
Friedenreich, CM, Wang, Q, Neilson, HK, Kopciuk, KA, McGregor, SE, Courneya, KS
European urology. 2016;(4):576-585
Abstract
BACKGROUND Despite the high global prevalence of prostate cancer (PCa), few epidemiologic studies have assessed physical activity in relation to PCa survival. OBJECTIVE To evaluate different types, intensities, and timing of physical activity relative to PCa survival. DESIGN, SETTING, AND PARTICIPANTS A prospective study was conducted in Alberta, Canada, in a cohort of 830 stage II-IV incident PCa cases diagnosed between 1997 and 2000 with follow-up to 2014 (up to 17 yr). Prediagnosis lifetime activity was self-reported at diagnosis. Postdiagnosis activity was self-reported up to three times during follow-up. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS Cox proportional hazards models related physical activity to all-cause and PCa-specific deaths and to first recurrence/progression of PCa. RESULTS AND LIMITATIONS A total of 458 deaths, 170 PCa-specific deaths, and, after first follow-up, 239 first recurrences/progressions occurred. Postdiagnosis total activity (>119 vs ≤42 metabolic equivalent [MET]-hours/week per year) was associated with a significantly lower all-cause mortality risk (hazard ratio [HR]: 0.58; 95% confidence interval [CI], 0.42-0.79; p value for trend <0.01). Postdiagnosis recreational activity (>26 vs ≤4 MET-hours/week per year) was associated with a significantly lower PCa-specific mortality risk (HR: 0.56; 95% CI, 0.35-0.90; p value for trend = 0.01). Sustained recreational activity before and after diagnosis (>18-20 vs <7-8 MET-hours/week per year) was associated with a lower risk of all-cause mortality (HR: 0.66; 95% CI, 0.49-0.88). Limitations included generalisability to healthier cases and an observational study design. CONCLUSIONS These findings support emerging recommendations to increase physical activity after the diagnosis of PCa and would inform a future exercise intervention trial examining PCa outcomes. PATIENT SUMMARY In a 17-yr prostate cancer (PCa) survival study, men who survived at least 2 yr who were more physically active postdiagnosis or performed more recreational physical activity before and after diagnosis survived longer. Recreational physical activity after diagnosis was associated with a lower risk of PCa death.