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Study shows benefits of exercise dependent on hours spent sitting

Study shows benefits of exercise dependent on hours spent sitting
Credit: Physiological Reviews (2023). DOI: 10.1152/physrev.00022.2022

The most comprehensive review of the effects of sedentary behavior on health and risk of death has intensified the call to reduce time spent being sedentary as well as increasing physical activity.

The extensive review, titled “Physiology of Sedentary Behavior,” published this month in Physiological Reviews, examines current understandings of sedentary behavior (SB).

It determines that the physiological evidence now available should be used to sharpen public health and clinical practice guidelines to extend beyond just the broadly prescribed message to exercise more, and to move towards a more comprehensive message of “sit less, move more and exercise.”

Head of the Baker Heart and Diabetes Physical Activity laboratory and Baker-Deakin Department of Lifestyle and Diabetes, Professor David Dunstan, is working with GPs and primary health providers to push for the inclusion of the question “How much time do you spend sitting?” into any conversation about physical activity, as the gains from physical activity depend on how much time you also spend sitting.

“So many of us think that if we go for a short walk, a jog, or do a session at the gym after a day sitting at our desks that we’re doing as much as we need to for good health, but it’s not the case,” Prof. Dunstan said. “That’s because the benefits of those physical activities depend on how much time you spend sitting.

“If, for example, you sat at your desk for hours, but then went out for a jog after work, yes, you’d certainly gain some health benefits from that run, but the nine hours seated during the day drags those health benefits down.

“By breaking up sitting time throughout the day, you break the accumulation of your sedentary time, which basically restarts the body’s engine (our

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