Premenopausal bone mass is related to physical activity

Area of Science:

• Exercise Science
• Bone Physiology
• Public Health

Background:

• Bone mineral density (BMD) is crucial for skeletal health and preventing osteoporosis.
• Peak bone mass is established during young adulthood and maintained thereafter.
• Factors influencing bone mass include genetics, nutrition, and lifestyle.

Purpose of the Study:

• To investigate the relationship between physical activity and bone mass in premenopausal women.
• To determine if physical activity levels correlate with bone mineral density and total body calcium.
• To explore the impact of lifestyle factors like smoking on bone health.

Main Methods:

• 24 healthy, white, premenopausal women participated.
• Physical activity was measured using a trunk movement sensor.
• Bone mineral density was assessed using single- and dual-photon absorptiometry.
• Total body calcium was determined by neutron activation analysis.

Main Results:

• Higher total physical activity correlated significantly with increased spine bone mineral density (r = .41).
• Total physical activity also showed a positive correlation with total body calcium levels (r = .51).
• No significant association was found between physical activity and bone density in the distal radius (r = .20).
• Cigarette smoking was negatively correlated with bone density in both the spine and radius.

Conclusions:

• Physical activity level is a potential determinant of peak total skeletal mass in sedentary white women.
• Higher physical activity may contribute to greater bone mineral density of the spine.
• Lifestyle choices, including smoking, negatively impact bone density.