Low-level mechanical vibrations can influence bone resorption and bone formation in the growing skeleton

Area of Science:

• Biomedical Engineering
• Skeletal Biology
• Mechanobiology

Background:

• Mechanical stimuli influence bone health.
• Previous studies show anabolic effects in adult skeletons.
• The impact on growing skeletons requires investigation.

Purpose of the Study:

• To investigate the effects of whole-body vibration (WBV) on bone formation and resorption in the growing skeleton.
• To determine if newly formed bone is of high quality.
• To assess if rest periods during WBV enhance efficacy.

Main Methods:

• Eight-week-old female mice were subjected to daily 15-minute whole-body vibration (45 Hz, 0.3 g) for 3 weeks.
• Groups included control, age-matched control, WBV, and WBV with rest periods (WBV-R).
• In vivo strain gaging measured periosteal strain; bone histomorphometry assessed cellular activity and bone formation rates.

Main Results:

• WBV significantly reduced osteoclastic activity in the tibia (33-31% decrease).
• Endocortical bone formation rates increased by 30% in the WBV group.
• WBV did not negatively affect body mass, bone length, or matrix quality; WBV-R showed no additional benefit.

Conclusions:

• Short-duration, low-magnitude, high-frequency mechanical signals (WBV) inhibit bone resorption and maintain bone formation in the growing skeleton.
• WBV can preserve bone matrix quality without adverse effects.
• This non-pharmacological method holds potential for increasing peak bone mass and reducing future osteoporosis and fracture risk.