Title: Exercise: The Cellular 'Fountain of Youth'
Headings: Exercise: The Cellular 'Fountain of Youth'
Exercise: The Cellular 'Fountain of Youth'
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Content: They also worked out more moderately -- walking on a treadmill -- twice a week. A second group performed moderate aerobic exercise -- using an exercise bike at a less-intense pace -- five days a week, for 30 minutes. They also did some light strength-training four days a week. The third group performed strengthening exercises only, two days a week. After 12 weeks, all of the groups were showing positive changes -- younger and older exercisers alike, the researchers found. People who performed moderate aerobic exercise boosted their fitness levels -- the body's ability to supply blood and oxygen to working muscles. And the improvement was greater for older adults, who generally started out with lower fitness levels than younger people. Meanwhile, people who performed strength-training -- alone or with aerobic exercise -- increased their muscle strength. The interval-training group showed only small gains in strength. But the training improved mitochondrial function in the muscles, especially among older adults.