Bone mineral density in flatwater sprint kayakers

Area of Science:

• Sports Science
• Orthopedics
• Human Physiology

Background:

• Kayaking involves intense muscular contractions and a non-weight-bearing loading pattern.
• Understanding the skeletal impact of such activities is crucial for athlete health and performance.
• Previous research has not fully elucidated the specific skeletal benefits of elite kayaking.

Purpose of the Study:

• To investigate the bone mineral density (BMD) and bone mineral content (BMC) in elite kayakers.
• To compare the skeletal status of kayakers with matched controls.
• To identify potential site-specific skeletal adaptations resulting from kayaking.

Main Methods:

• Dual-energy X-ray absorptiometry (DXA) was used to measure BMD and BMC in 10 elite kayakers and matched controls.
• Measurements included total body, head, ribs, humerus, legs, proximal femur, spine, lumbar spine, and arms.
• Body composition was also assessed for all participants.

Main Results:

• Kayakers exhibited significantly greater BMD in upper body sites, including the humerus, ribs, and spine.
• Kayakers also showed significantly higher BMC in the arms.
• While total body and lower body BMD were similar, kayakers had greater pelvic BMD. Controls had lower lean body mass and higher body fat percentage.

Conclusions:

• The unique loading pattern and muscular contractions in kayaking may lead to site-specific skeletal adaptations.
• Elite kayakers demonstrate enhanced upper body bone density, suggesting a positive impact of the sport on skeletal health.
• Training effects in kayakers appear to override typical correlations between BMD and body composition found in controls.