Wednesday, 2 October 2013

Exercise as effective as drugs for treatment of many diseases?

Coronary heart disease now costs the NHS £1.6bn a year to treat and costs the UK economy around £10bn. Yet when was the last time your doctor told you to take more physical exercise? 

Your GP may weigh you, take your blood pressure and pulse. You might be on repeat prescriptions for drugs. But a new review of evidence published today on bmj.com suggests that physical activity is potentially as effective as many drug interventions for patients with existing coronary heart disease and stroke.

Are we overdependent on drugs?

The researchers argue that more trials comparing the effectiveness of exercise and drugs are urgently needed to help doctors and patients make the best treatment decisions. In the meantime, they say exercise “should be considered as a viable alternative to, or alongside, drug therapy.”

Physical activity has well documented health benefits. Our sedentary lifestyles may be killing us, yet statistics from the British Heart Foundation show that in the UK only 14% of adults exercise regularly, with roughly one third of adults in England meeting recommended levels of physical activity.  

In contrast, prescription drug rates continue to skyrocket sharply rising to an average of 17.7 prescriptions for every person in England in 2010, compared with 11.2 in 2000.  We are becoming a nation on medication when exercise might be the best 'treatment'.

But there is still very little evidence on how exercise compares with drugs in reducing the risk of death for common diseases.

In the current analysis researchers based at the London School of Economics, Harvard Pilgrim Health Care Institute at Harvard Medical School and Stanford University School of Medicine set out to compare the effectiveness of exercise versus drugs on mortality across four conditions (secondary prevention of coronary heart disease, rehabilitation of stroke, treatment of heart failure and prevention of diabetes).

Secondary prevention refers to treating patients with existing disease before it causes significant illness.

They analysed the results of 305 randomised controlled trials involving 339,274 individuals and found no statistically detectable differences between exercise and drug interventions for secondary prevention of heart disease and prevention of diabetes.

Among stroke patients, exercise was more effective than drug treatment, while for heart failure, diuretic drugs were more effective than exercise and all other types of drug treatment.

The need for more evidence

So is exercise as effective as drugs in treatment of diseases? It is probably too early to say with certainty. The authors point out that the amount of trial evidence on the mortality benefits of exercise is considerably smaller than that on drugs, and this may have had an impact on their results.

They argue that this “blind spot” in available scientific evidence “prevents prescribers and their patients from understanding the clinical circumstances where drugs might provide only modest improvement but exercise could yield more profound or sustainable gains in health.”

Physical activity potentially as effective as many drugs

Despite this uncertainty, they say that, based on the available data, physical activity is potentially as effective as many drug interventions – and call for more trials to address the disparity between exercise and drug-based treatment evidence.

“In cases where drug options provide only modest benefit, patients deserve to understand the relative impact that physical activity might have on their condition,” they conclude.

Changing lifestyle may be more effective at treating and preventing diseases. But experience demonstrates it is more difficult to achieve than it seems. We have known for decades that regular exercise is beneficial yet so few of us do it. We live increasingly sedentary lives. Increasing awareness of the importance of exercise is insufficient to bring about an effective change.

Read also:

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