Published: 22-08-2019 00:30 | Updated: 26-08-2019 09:53

Move more - Sit less

Clear evidence that higher levels of physical activity - regardless of intensity - are associated with a lower risk of early death in middle aged and older people, is published by The BMJ today. The findings also show that being sedentary, for example sitting still, for 9.5 hours or more a day is associated with an increased risk of death.

Previous studies have repeatedly suggested that sedentary behaviour is bad and physical activity is good for health and long life. So exactly how much activity (and at what intensity) is needed to protect health remains unclear. To explore this further, researchers led by Professor Ulf Ekelund at the Norwegian School of Sport Sciences in Oslo analysed observational studies assessing physical activity and sedentary time with death (“all cause mortality”).
Maria Hagströmer, Associate Professor at NVS, KI, and Ing-Mari Dohrn, Postdoctoral Researcher at NVS, KI are co-authors and have contributed with the Swedish data included in the study and analysed these.
"The results are in good agreement with the current recommendations of 150 minutes per week at moderate intensity," says Maria Hagströmer.

Studies used accelerometers (a wearable device that tracks the volume and intensity of activity during waking hours) to measure activity in counts per minute (cpm) of wear time.
Examples of light intensity activity includes walking slowly or light tasks such as cooking or washing dishes. Moderate activity includes brisk walking, vacuuming or mowing the lawn, while vigorous activity includes jogging, carrying heavy loads or digging.
”A major advantage of accelerometers is that we can also get information about low-intensity activities, such as everyday tasks, which are difficult to self-estimate and report. We saw that the risk of dying decreased sharply in more than 5 hours of low-intensity activity per day”, says Ing-Mari Dohrn.

Data from eight high quality studies involving 36,383 adults aged at least 40 years (average age 62) were included. Activity levels were categorised into quarters, from least to most active, and participants were tracked for an average of 5.8 years. During follow-up, 2149 (5.9%) participants died. 
“Developing ways to limit sedentary time and increase activity at any level could considerably improve health and reduce mortality,” the researchers conclude.

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Maria Hagströmer

Professor/Physical Therapist
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Ing-Mari Dohrn

Assistant Senior Lecturer