Exercising Regularly Strengthens the Immune System

A good thing to keep in mind during a pandemic.

Being in isolation without access to gyms and sports clubs should not mean people stop exercising, according to a new study from researchers at the University of Bath. Keeping up regular, daily exercise at a time when much of the world is going into isolation will play an important role in helping to maintain a healthy immune system.

The analysis, published in the international journal Exercise Immunology Review, involving leading physiologists Dr James Turner and Dr John Campbell from the University of Bath’s Department for Health, considers the effect of exercise on our immune function.

Over the last four decades, many studies have investigated how exercise affects the immune system. It is widely agreed that regular moderate intensity exercise is beneficial for immunity, but a view held by some is that more arduous exercise can suppress immune function, leading to an ‘open-window’ of heightened infection risk in the hours and days following exercise.

In a benchmark study in 2018, this ‘open window’ hypothesis was challenged by Dr Campbell and Dr Turner. They reported in a review article that the theory was not well supported by scientific evidence, summarising that there is limited reliable evidence that exercise suppresses immunity, concluding instead that exercise is beneficial for immune function.

They say that, in the short term, exercise can help the immune system find and deal with pathogens, and in the long term, regular exercise slows down changes that happen to the immune system with ageing, therefore reducing the risk of infections.

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