Exercise boosts immunity and makes vaccines more effective – new study
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Exercise boosts immunity and makes vaccines more effective – new study

Coronavirus chronicle

TBS Report
21 April, 2021, 12:05 pm
Last modified: 21 April, 2021, 02:41 pm

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Exercise boosts immunity and makes vaccines more effective – new study

A study from 2008 found that physical inactivity is responsible for more than five million premature deaths every year

TBS Report
21 April, 2021, 12:05 pm
Last modified: 21 April, 2021, 02:41 pm
Photo: UNB
Photo: UNB

The availability of vaccines has raised hopes of an end to the pandemic. Yet Covid deaths and lawsuits are still ongoing around the world. 

After we try to immunise the world, the most likely situation in the next few years Covid-19 will be like other contagious diseases like flu. That's why we need to constantly manage and protect against the virus reports The Conversation.

One of the best ways to do that is by being physically active.

We already know that physical activity is one of the most effective ways to prevent chronic diseases, along with diet and quitting smoking. A study from 2008 found that physical inactivity is responsible for more than five million premature deaths every year.

Now, a new systematic review of evidence by Professor Sebastien Chastin, Health Behaviour Dynamics, Glasgow Caledonian University and his colleagues shows that regular physical activity strengthens the human immune system, reduces the risk of falling ill and dying from infectious disease by more than a third and significantly increases the effectiveness of vaccination campaigns. This has important implications for pandemic responses.

In the study, the researchers systematically gathered and reviewed all available evidence relating to the effect of physical activity on the risk of falling ill and dying from infectious diseases such as pneumonia – a frequent cause of death from Covid-19 – on the functioning of the immune system and on the outcome of vaccination. The study was conducted too early in the pandemic to include research into Covid-19 itself, but the findings are highly relevant to the current pandemic response.

The researchers found consistent and compelling evidence across six studies involving more than a half-million participants that meeting the recommended guidelines for physical activity – 30 minutes of activity, five days a week – reduces the risk of falling ill and dying of infectious diseases by 37%.

This adds to the results of another new study conducted in the United States specifically on Covid-19. The effect is at least as strong if not more so than the effect reported for other risk factors of Covid-19 such as age or having a pre-existing condition such as diabetes.

They also found reliable evidence that regular physical activity strengthens the human immune system. Across 35 independent randomised controlled trials – the gold standard for scientific evidence – regular physical activity resulted in elevated levels of the antibody immunoglobulin IgA. This antibody coats the mucosal membrane of our lungs and other parts of our body where viruses and bacteria can enter.

Regular physical activity also increases the number of CD4+ T cells, which are responsible for alerting the immune system of an attack and regulate its response.

Finally, in the randomised controlled trials the researchers studied, vaccines appear more effective if they are administered after a programme of physical activity. A person who is active is 50% more likely to have a higher antibody count after the vaccine than somebody who is not active.

This can be a cost-effective and easy way of boosting vaccination campaigns. Considering the difficulties in supply chains, this could be a wise move to make every dose count.

How physical activity wards off disease

There are three mechanisms that make physical activity an effective medicine against infectious diseases.

First, it protects against risk factors of severe and fatal infection. Physically active people are less likely to develop obesity, diabetes, respiratory and cardiovascular conditions. Epidemiological studies have shown that Covid-19 and other respiratory infectious diseases are more severe for people who have these conditions.

Physical activity also reduces stress and chronic inflammation, in turn reducing the likelihood of adverse and fatal infections. Most Covid-19 and pneumonia fatalities have been as a result of uncontrolled inflammatory response.

Finally, our immune system is stronger if we are physically active.

We need to get moving

Physical activity is undeniably an important way to make populations less vulnerable to infectious diseases and future epidemics and pandemics. It should be used more urgently and effectively in fighting the current Covid-19 outbreak, but also as a long term investment to prevent the devastating social and economic impacts this pandemic has had on society.

Governments encouraged people to stay active early in the pandemic to cope with lockdown measures. There was a surge of interest in exercise immediately following lockdown in most communities. Unfortunately, this has not translated into positive change in activity levels.

Instead, an apparent decrease in physical activity levels has been seen globally in the past year. This is a dangerous trend that could make the population more vulnerable to infectious and chronic diseases in the short term. Left unchecked, it will also leave a damaging long-term legacy and increase the burden of disease and its associated social and economic cost.

Underestimating the impact of physical inactivity could also exacerbate the unsustainable and unacceptable health inequalities highlighted by the pandemic. Generally, physical activity levels are lower in societies with greater economic inequalities and this affects women most.

It is now more important than ever for governments and health professionals to galvanise all sectors of society to promote physical activity.

Every move counts in fighting this pandemic and managing infectious disease in the future.

Top News / World+Biz

exercise / immunity / boost / Vaccine / COVID-19

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