The findings also show that being sedentary, for example sitting still, for 9.5 hours or more a day (excluding sleeping time) 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.
Guidelines - Minutes - Intensity - Minutes - Activity
Guidelines recommend at least 150 minutes of moderate intensity or 75 minutes of vigorous physical activity each week, but are based mainly on self reported activity, which is often imprecise. 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").
Studies - Accelerometers - Device - Volume - Intensity
Studies used accelerometers (a wearable device that tracks the volume and intensity of activity during waking hours) to measure total activity in counts per minute (cpm) of wear time. Intensity is usually separated into light, moderate and vigorous -- and the time in these intensities is then estimated.
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.
Data - Quality - Studies - Adults - Years
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. After adjusting for potentially influential factors, the researchers found that any level of physical activity, regardless of intensity, was associated with a substantially lower risk of death.
Deaths - Activity - Plateau - Cpm - Activity
Deaths fell steeply as total activity increased up to a plateau at 300 cpm, similar to the average activity levels in a...
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