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Quantifying leisure physical activity and its relation to bone density and strength.

Abstract：

PURPOSE:Compare three published methods of quantifying physical activity (total activity, peak strain, and bone-loading exposure (BLE) scores) and identify their associations with areal bone mineral density (aBMD), volumetric BMD (vBMD), and bone strength. METHODS:Postmenopausal women (N = 239; mean age: 53.8 yr) from Iowa (ISU) and California (UCD) completed the Paffenbarger Physical Activity Questionnaire, which was scored with each method. Dual energy x-ray absorptiometry assessed aBMD at the spine, hip, and femoral neck, and peripheral quantitative computed tomography (pQCT) measured vBMD and bone strength properties at the distal tibia and midshaft femur. RESULTS:UCD women had higher total activity scores and hours per week of leisure activity. All scoring methods were correlated with each other. No method was associated with aBMD. Peak strain score was negatively associated with polar moment of inertia and strength-strain index at the tibia, and total activity score was positively associated with cortical area and thickness at the femur. Separating by geographic site, the peak strain and hip BLE scores were negatively associated with pQCT measures at the tibia and femur among ISU subjects. Among UCD women, no method was significantly associated with any tibia measure, but total activity score was positively associated with measures at the femur (P < 0.05 for all associations). CONCLUSION:Given the significantly greater hours per week of leisure activity done by UCD subjects, duration may be an important determinant of the effect physical activity has on bone. The positive association between leisure physical activity (assessed by the total activity score) and cortical bone measures in postmenopausal women may indicate a lifestyle factor that can help offset age-related bone loss.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Shedd KM,Hanson KB,Alekel DL,Schiferl DJ,Hanson LN,Van Loan MD

doi

10.1249/mss.0b013e318155a7fe

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

2189-98

issue

eissn

0195-9131

issn

1530-0315

pii

00005768-200712000-00012

journal_volume

pub_type

杂志文章,多中心研究

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Quantifying leisure physical activity and its relation to bone density and strength.