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Training very hard 'as bad as no exercise at all' | |
(3 days later) | |
Training very hard may be as bad for you as not putting on your running shoes at all, a report in the Journal of the American College of Cardiology says. | |
Scientists studied more than 1,000 healthy joggers and non-joggers over a 12-year period. | Scientists studied more than 1,000 healthy joggers and non-joggers over a 12-year period. |
The study suggests jogging at a steady pace for less than two and a half hours a week was best for health. | |
UK guidance says adults should aim for 150 minutes of exercise each week. | |
'Upper limit' | 'Upper limit' |
The Danish study asked participants to register how frequently they jogged, for how long and at what intensity - as well as requesting details of their health. | |
The scientists concluded the ideal pace to jog was about 5mph (8km/h) - and that it was best to jog no more than three times a week or for 2.5 hours in total. | |
Researcher Jacob Louis Marott, from the Frederiksberg Hospital in Copenhagen, said: "You don't actually have to do that much to have a good impact on your health. | Researcher Jacob Louis Marott, from the Frederiksberg Hospital in Copenhagen, said: "You don't actually have to do that much to have a good impact on your health. |
"And perhaps you shouldn't actually do too much. | "And perhaps you shouldn't actually do too much. |
"No exercise recommendations across the globe mention an upper limit for safe exercise, but perhaps there is one." | "No exercise recommendations across the globe mention an upper limit for safe exercise, but perhaps there is one." |
This is a small study, particularly when it comes to the people in the most active groups - only 36 were classified as "strenuous" joggers and just two of this group died. | |
So experts caution this makes it harder to detect and be confident of the differences between each group. | |
But the paper does build on previous research, such as this study in mice, which suggested exercise affected heart rhythm, and other work which has suggested long-term strenuous endurance exercise can damage the heart. | |
'Brisk walking' | 'Brisk walking' |
Maureen Talbot, senior cardiac nurse at the British Heart Foundation, said: "This study shows that you don't have to run marathons to keep your heart healthy. | Maureen Talbot, senior cardiac nurse at the British Heart Foundation, said: "This study shows that you don't have to run marathons to keep your heart healthy. |
"Light and moderate jogging was found to be more beneficial than being inactive or undertaking strenuous jogging, possibly adding years to your life. | "Light and moderate jogging was found to be more beneficial than being inactive or undertaking strenuous jogging, possibly adding years to your life. |
"National guidelines recommend we do 150 minutes of moderate-intensity activity a week. | "National guidelines recommend we do 150 minutes of moderate-intensity activity a week. |
"It may sound like a lot, but even brisk walking is good exercise. And if you're bit of a couch potato, this is a good place to start." | "It may sound like a lot, but even brisk walking is good exercise. And if you're bit of a couch potato, this is a good place to start." |
Update 6 February 2015: This story, which was first published on 3 February, has been amended to give more detail of the scale of the study. |
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