Related Experiment Videos
Effects of physical training on cortical bone at midtibia assessed by peripheral QCT
LiJing Liu1, Ryouko Maruno, Tomoko Mashimo
1Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8574, Japan.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 25, 2003
Summary
Long-term exercise improves bone strength in young adults primarily through geometric changes, not increased bone mineral density. Athletes showed enhanced bone geometry, indicating adaptation to physical demands.
Area of Science:
- Orthopedics
- Sports Medicine
- Bone Physiology
Background:
- Long-term exercise influences bone health.
- Understanding exercise-induced bone adaptations is crucial for injury prevention and performance.
Purpose of the Study:
- To investigate the effects of long-term exercise on bone properties in athletes.
- To differentiate the roles of volumetric bone mineral density (vBMD) and bone geometry in exercise-related bone adaptations.
Main Methods:
- Cross-sectional study comparing jumpers, swimmers, and controls (aged 18-23).
- Peripheral quantitative computed tomography (pQCT) used to scan tibial bone properties.
- Analysis included vBMD, bone geometry, and strength indexes.
Main Results:
- Female athletes had lower cortical vBMD than controls.
- Male jumpers and female athletes exhibited larger periosteal areas.
- Bone strength indexes, like polar moment of inertia, were higher in male jumpers and female athletes.
- Endocortical area was greater in female swimmers.
Conclusions:
- Long-term exercise enhances bone mechanical properties in young adults.
- Adaptations are primarily driven by geometric changes in bone structure.
- Volumetric bone mineral density does not appear to be the main factor in exercise-induced bone strength improvements.