Weight bearing exercise helps to increase bone density, therefore lowering your risk of osteoporosis, etc
Take in lots of calcium, exercise like running will increase bone density,
Not many. Regular resistance exercise and aerobic exercise can actually help to increase bone density, reducing the risk of fractures. As with any program of exercise, consult a physician before beginning.
calcium supplementation may have added benefits for improving bone mineral density
No, a lack of exercise typically leads to decreased bone density rather than thicker bones. Regular weight-bearing exercise can help maintain and improve bone density by stimulating the bones to become stronger.
Wolff's Law
No, it does not decrease your bone density. Rather, exercising potentially stimulates the tissues and blood vessels around your bones, prompting them to better maintain their density. While you can take actions to promote bone health, there is little you can do to directly affect increasing or decreasing your bone density intentionally.
Osteoporosis
For bone density to be effected by exercise you should use appropriate (end to end) loading.The effect of exercise on bone density depends on the exercise in question.Examples of exercise that would increase bone density are those which load the bone from one end to the other providing impact or external resistance (weight) loading through the bone i.e.- Walking/jogging - the impact of the foot striking the floor causes the leg bones to be loaded appropriately. Jogging would be better than walking as there is greater impact.- Pressing/Pushing a weight or your body (such as press ups or bench press) loads the bones in the arms appropriately whereas pulling exercises or rotating (bicep curl for instance) does not apply any such load.Cycling has some loading whereas swimming on the other hand does not load the bone and would have little benefit for increasing bone density.Note: You should be cautious of impact however as weak joints can be damaged. Build up slowly i.e. walking instead of jogging or by using a workout based on your current level of fitness and designed to increase bone density.
A hypothesis for a study involving bones could be: "Increased weight-bearing exercise will lead to an increase in bone mineral density among post-menopausal women." This hypothesis tests the relationship between a specific type of exercise and its effect on bone health in a specific population.
No
There is the possibility that low bone density can increase health risks. One possible risk for those with low bone density is an increase risk of bone fracture, especially in older women who suffer fractures to the hip and pelvis areas as the result of falls.