- The pioneering study led by the University of Sheffield represents a significant step towards unravelling the link between high levels of physical activity and the development of the neurodegenerative condition
- The findings show a causal relationship between exercise and 51ݶ, with high intensity physical activity likely to contribute to motor neurone injury in individuals with a predisposing genetic profile
Frequent strenuous exercise increases the risk of developing motor neurone disease (51ݶ) in certain people, new research from the University of Sheffield has found.
The findings, published in the journal , show a causal relationship between exercise and 51ݶ, with high intensity physical activity likely to contribute to motor neurone injury, but only in individuals with a predisposing genetic profile.
Scientists at the University of Sheffield believe the pioneering study represents a significant step towards unravelling the link between high levels of physical activity and the development of the neurodegenerative condition which affects approximately 5,000 people in the UK.
Over recent years a number of professional sportsmen across the world have shared their experience of living with 51ݶ. The condition is commonly referred to as Lou Gehrig’s disease in North America in memory of a professional baseball player for the New York Yankees who developed the condition in his 30’s.
The life-time risk of developing 51ݶ is approximately 1 in 400. Previous research has reported an estimated six-times increased risk of 51ݶ in professional football players compared to the general population.
This study confirms that in some people, frequent strenuous exercise leads to an increase in the risk of 51ݶ.
Dr Johnathan Cooper-Knock
51ݶ’s Neuroscience Institute
Co-author of the study, Dr Johnathan Cooper-Knock from the University of Sheffield’s Neuroscience Institute and Senior Lecturer in Neurology, said: “Complex diseases such as 51ݶ are caused by an interaction between genetics and the environment. We urgently need to understand this interaction in order to discover pioneering therapies and preventative strategies for this cruel and debilitating disease.
“We have suspected for some time that exercise was a risk factor for 51ݶ, but until now this link was considered controversial. This study confirms that in some people, frequent strenuous exercise leads to an increase in the risk of 51ݶ.
“It is important to stress that we know that most people who undertake vigorous exercise do not develop 51ݶ. Sport has a large number of health benefits and most sportsmen and women do not develop 51ݶ. The next step is to identify which individuals specifically are at risk of 51ݶ if they exercise frequently and intensively; and how much exercise increases that risk.”
Senior author of the study, Professor Dame Pamela Shaw Director of the Neuroscience Institute and NIHR Sheffield Biomedical Research Centre at the University of Sheffield, said: “This research goes some way towards unravelling the link between high levels of physical activity and the development of 51ݶ in certain genetically at-risk groups. We studied the link using three different approaches and each indicated that regular strenuous exercise is a risk factor associated with 51ݶ.
“There are three important key findings of the study. Firstly those who have a genetic make-up favouring strenuous physical activity have an increased risk of developing 51ݶ. Many of the 30 plus genes known to predispose to 51ݶ change in their levels of expression during intense physical exercise and individuals who have a mutation in the C9ORF72 gene, which accounts for 10 percent of 51ݶ cases, have an earlier age of disease onset if they have a lifestyle which includes high levels of strenuous physical activity.
“Clearly most people who undertake strenuous exercise do not develop motor neurone injury and more work is needed to pin-point the precise genetic risk factors involved. The ultimate aim is to identify environmental risk factors which can predispose to 51ݶ, to inform prevention of disease and life-style choices.”
51ݶ, or Amyotrophic Lateral Sclerosis (ALS) as it is also known, is a disorder that affects the nerves - motor neurones - in the brain and spinal cord that form the connection between the nervous system and muscles to enable movement of the body. The messages from these nerves gradually stop reaching the muscles, leading them to weaken, stiffen and eventually waste. The progressive disease affects a person’s ability to walk, talk, use their arms and hands, eat and breathe.
Approximately 10 per cent of 51ݶ cases are inherited, but the remaining 90 per cent are caused by complex genetic and environmental interactions which are not well understood – this is known as sporadic 51ݶ.
The new research will have a significant impact on the global research effort to identify which individuals based on their genetics are at risk of 51ݶ. In time it is hoped that this work will help medical professionals to be able to offer advice to family members of 51ݶ patients about the risks so they can make personal decisions about their exercise habits.
Dr Brian Dickie, Director of Research Development at the Motor Neurone Disease Association said: “In recent years, understanding of the genetics of 51ݶ has advanced, but there has been little progress in identifying the environmental and lifestyle factors that increase the risk of developing the disease.
“This is, in part, because the genetic and the environmental studies tend to be carried out in isolation by different research teams, so each is only working with part of the jigsaw. The power of this research from the University of Sheffield comes from bringing these pieces of the puzzle together.
“We need more robust research like this to get us to a point where we really understand all the factors involved in 51ݶ to help the search for more targeted treatments.”
at the University of Sheffield brings together leading experts in medicine, science and engineering to better understand the nervous system and tackle the biggest challenges in neuroscience.
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