physical activity

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The Health Risks of Prolonged Occupational Sitting and the Benefits of Physical Activity

The 2020 World Health Organisation guidelines on physical activity highlighted the importance of reducing sedentary behaviour due to its negative health effects. However, the specific impact of prolonged sitting at work, particularly in the context of varying levels of physical activity, has not been fully explored. A recent prospective cohort study in Taiwan, published earlier this year in JAMA Network Open sheds light on this issue, focusing on the health outcomes associated with occupational sitting among apparently healthy individuals. The study followed 481,688 participants over an average period of 12.85 years, collecting data on their occupational sitting habits, leisure-time physical activity (LTPA), lifestyle choices, and metabolic health. The findings revealed that individuals who predominantly sat at work had a 16% higher risk of all-cause mortality, and a 34% higher risk of cardiovascular disease mortality compared to those who predominantly did not sit at work. These increased risks persisted even after accounting for factors such as age, sex, education, smoking, drinking, and body mass index. To counteract the negative effects of prolonged sitting, the study suggests that individuals who sit most of the day at work should aim to add 15 to 30 minutes of physical activity per day. This additional…

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Sedentary Behaviour and Sleep Quality

High-quality sleep is an important factor in sustaining health and improving well-being. Previous evidence has demonstrated the positive associations between increased physical activity and reduced sedentary behaviour (SB) with sleep quality. In a recent study published in Scientific Reports in January 2023, researchers in Japan aimed to explore the relationship between sedentary behaviour (SB), light-intensity physical activity (LPA), moderate-to-vigorous physical activity (MVPA) and sleep quality in middle-aged adults. The study used an isotemporal substitution approach to examine the relationship between physical activity and sleep quality. This approach involves replacing one type of activity with another while keeping the total amount of time spent active the same. The participants were middle-aged adults who wore accelerometers to objectively measure their daily time spent in sedentary behaviour, light physical activity (LPA), and MVPA. They also completed self-reported questionnaires to assess their rest by sleep and sleep quality. The results of the study showed that each 60-minute unit of sedentary time or LPA replaced with MVPA was associated with improved rest by sleep in women. However, there were no significant associations found between physical activity levels and sleep measures in men across all three models. The study highlights the importance of considering substitutional relationships…

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