[Exercise reduces bone mineral density loss in women]

Area of Science:

• Exercise physiology
• Bone biology
• Gerontology

Background:

• Bone strength is crucial for skeletal health throughout life.
• Mechanical loading is a primary stimulus for bone development and maintenance.
• Age, sex, and hormonal factors can influence bone's response to training.

Purpose of the Study:

• To evaluate the impact of high-impact training on bone strength across different life stages.
• To assess the osteogenic potential of various exercise modalities.
• To understand factors modulating training effects on bone mass.

Main Methods:

• Review of existing literature on exercise and bone density.
• Analysis of studies involving different age groups (prepubertal, adult, elderly).
• Examination of training effects in conjunction with hormonal status (estrogen, contraceptives).

Main Results:

• Adequate mechanical load stimulates bone strength irrespective of age or hormonal status, though magnitude varies.
• High-impact training is effective, while walking offers limited osteogenic benefit except in sedentary individuals.
• Bone mass gains are partially retained with aging.
• Combined estrogen therapy and training show modest benefits in postmenopausal women.
• Hormonal contraceptives may diminish training-induced bone benefits in premenopausal women.

Conclusions:

• High-impact training is a fundamental strategy for optimizing bone strength throughout the lifespan.
• Exercise interventions should be tailored considering age, hormonal status, and specific goals like fall prevention.
• Further research is needed to fully elucidate the interplay between training, hormones, and bone health across diverse populations.