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For strong bones get into gardening and tea News in Science ABC Science,[link widoczny dla zalogowanych]
Throw away the jogging shoes and pick up the hedge clippers,[link widoczny dla zalogowanych]. A large US study has found gardening is the best form of exercise for maintaining bone health; and another study in Britain suggests drinking tea may also help hold off osteoporosis,[link widoczny dla zalogowanych].
The US study, by Dr Lori Turner and colleagues at the University of Arkansas, looked at the health habits of over 40,[link widoczny dla zalogowanych],000 women,[link widoczny dla zalogowanych], including more than 3,[link widoczny dla zalogowanych],000 aged 50 years and older. Those in the 50-plus age group that gardened at least once a week showed higher bone density measurements than those who regularly did other kinds of exercise. Higher bone density readings mean a lower risk of fractures in later life.
The researchers were surprised to find that gardening had such a strong effect. "We hadn't expected yard work to be significant," said Dr Turner. "But there's a lot of weight-bearing motion going on in the garden -- digging holes,[link widoczny dla zalogowanych], pulling weeds, pushing a mower."
She speculated that being outdoors might add to the bone-strengthening effects, since sunlight stimulates production of vitamin D which helps the body absorb dietary calcium.
Weight-bearing exercise is any activity that requires the bones to fully support the body's weight, such as jogging, dancing and weight training. Gardening and weight training were the only exercises found to significantly improve bone density in the age group studied. Jogging has also been found to be effective in other studies, but is much less popular than gardening, said Dr Turner. Nearly half the women in the study said they gardened on a weekly basis.
Meanwhile,[link widoczny dla zalogowanych], according to a different study in Britain,[link widoczny dla zalogowanych], women who indulge in the gentle pastime of drinking tea also seem to have some protection against bone loss.
Researchers measured bone density at strategic points in the hip and spine of 1,256 women aged 65 to 76. Tea-drinkers had 5 per cent higher average density measurements than non tea-drinkers, even after taking into account other major factors affecting bone density (smoking,[link widoczny dla zalogowanych], coffee and hormone replacement therapy). The study was reported in the American Journal of Clinical Nutrition.
The effect could not be explained by the calcium in the milk added to tea, said the researchers,[link widoczny dla zalogowanych], because women who didn't take milk also benefited. They suggest that compounds found in tea called isoflavinoids - thought to help prevent bone loss in a similar manner to the hormone oestrogen - may be responsible.
Critics,[link widoczny dla zalogowanych], however, have pointed out that if tea does have a protective effect it must be very weak,[link widoczny dla zalogowanych], because Britain has very high rates of tea-drinking, but also very high rates of osteoporosis.
Likewise,[link widoczny dla zalogowanych], gardening alone is no guarantee of bone health. Consuming sufficient quantities of calcium and not smoking were also important preventative measures,[link widoczny dla zalogowanych], said the US researchers.相关的主题文章：

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