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Coronavirus live news: New Zealand battles first Delta outbreak, vaccine warning for south-east Asia

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New Zealand prime minister Jacinda Ardern placed the country in a snap coronavirus lockdown after its first case of the Delta variant emerged on Tuesday. Photograph: Mark Mitchell/AP

A lack of exercise is linked to an increased risk of severe Covid-19 and associated complications, according to a study in the British Journal of Sports Medicine.

Researchers compared hospitalisation rates, intensive care (ICU) admissions and mortality among almost 50,000 patients with Covid-19 who were consistently inactive, doing some activity or consistently reporting doing sufficient exercise.

It found that, “consistently meeting physical activity guidelines was strongly associated with a reduced risk for severe Covid-19 outcomes among infected adults.”

The researchers recommend public health agencies to prioritise the promotion of physical activity and to incorporate it into routine medical care.

Obesity increases the risk of dying of Covid-19 by nearly 50% and may make vaccines against the disease less effective, according to a comprehensive study using global data. About 2.2m of the 2.5m deaths related to Covid as of March were in countries with high levels of overweight people, says a report from the World Obesity Federation.

Writing in the Conversation, clinician scientist Jane Thornton, from Western University in Canada, said:

Statistics Canada’s data on Canadian Covid-19 deaths in 2020 reported at least one comorbidity present in 90% of all Covid-19-related deaths (including younger age groups). A comorbidity is a disease or condition that a patient has at the same time as another illness. Many of the most common comorbid conditions on the list — including high blood pressure, heart disease and diabetes — are linked to physical inactivity.

As a part of prevention and treatment of these comorbid conditions that put people at greater risk, access to physical activity for all must play a central part in this change. Physicians and other health care providers can play a part by prescribing physical activity, facilitating access and measuring outcomes.

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