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How running can benefit your joints

Published: 26th January 2021

With gyms being closed during lockdown, many of us have been taking to the streets to walk and run for our daily exercise, but what impact does pounding the pavements have on our knees?

Despite running receiving a large amount of criticism, mainly in that it wears out your joints, inactivity is in fact more likely to be detrimental to your knees than running.

When people think of joints wearing out, they are most likely describing the onset of osteoarthritis. Osteoarthritis is a specific series of changes in a joint that become more prevalent as we age. Doctors identify these changes as a loss of cartilage (the smooth, glossy surface you see at the ends of the bone in a drumstick) and inflammation in the joint. These changes can result in pain, which can be quite severe when we’re active. With this in mind, it would make sense that jarring joints repetitively during exercise sessions, like running, would increase these degenerative processes – but that’s where the science disagrees.

The first piece of evidence comes from the fact that as we have become more and more sedentary, rates of osteoarthritis are increasing. Between the preindustrial era (up until the mid-18th century) and post-industrial times (from about 1945 onwards), people became increasingly inactive as sedentary lifestyles became the norm. Yet studies of the knees of skeletons in preindustrial times show less prevalence of osteoarthritis than the knees of skeletons in post-industrial times. If excessive use increases joint degeneration and increases inflammation – how could a more sedentary era see an increase of osteoarthritis?

The second piece of evidence comes from a two-decade long study of runners and non-runners. The study, which tracked long distance runners and non-runners aged 50 and over, showed no difference in osteoarthritis prevalence as evident on x-rays.

However, there is a caveat to this. Sustaining an injury while running that disrupts the ligaments and/or the meniscus (the fibrous cartilage) in the knee can increase the likelihood of getting osteoarthritis in the future. This is different, however, to the loads and impacts sustained during normal running.

The scientific evidence indicates that running does not wear out your joints, but actually helps prevent osteoarthritis.

How running benefits your joints

1. Joint nutrition. Nutrients are delivered to cartilage through repeated compression of joint surfaces. Therefore, being active – doing activities such as running – can enhance the health of cartilage.

2. Weight control. Obesity is one of the most common causes of excess joint loading. Exercise is a great way to control weight and therefore give your joints respite from enduring excessive loads during everyday activities.

3. Reduced inflammation. The onset of osteoarthritis is associated with inflammatory processes within the affected joint. Exercise has been shown to reduce ongoing inflammation that can increase as we age.

4. Muscle strength. Muscles support and help protect our joints. Therefore, maintaining muscle bulk through being active helps prevent the chances of deterioration.

Daniel Lieberman, an evolutionary biologist at Harvard, considers the increased prevalence of osteoarthritis an evolutionary mismatch – meaning the way we use our joints today doesn’t match the way they are designed. It’s clear sedentary lifestyles, obesity, and chronic inflammation are the big contributors to conditions like osteoarthritis – not running. So, let’s give runners a well-earned break.

A good way to reduce your risk of running injuries and protect your joints is to vary your training. Rather than running on the pavement every day, try doing some off-road runs and mix them up with strength exercises. You can access a huge range of Les Mills virtual classes that you can do at home, particularly useful for strength and flexibility, via our app for only £5 per month – or FREE if you’re an Active Premier member.

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