Passive exercise failed to reverse OVX-induced bone microstructural degeneration to the extent achieved by HRT

Area of Science:

• Bone biology and metabolism
• Endocrinology
• Exercise physiology

Background:

• Postmenopausal osteoporosis results from estrogen deficiency, increasing fracture risk.
• Hormone replacement therapy (HRT) is a common treatment, but alternatives are sought.
• Estrogen deficiency significantly impacts bone microarchitecture and increases fragility.

Purpose of the Study:

• To assess whole-body vibration training (WBVT) as an alternative to 17β-estradiol (E2) for postmenopausal osteoporosis.
• To investigate if combining WBVT with E2 supplementation offers superior bone protection.
• To evaluate the effects of WBVT and E2 on bone microarchitecture, metabolism, and biomechanics.

Main Methods:

• Ovariectomy (OVX) was performed on mice to induce osteoporosis.
• OVX mice were treated with E2, WBVT, E2+WBVT, or no treatment for 10 weeks.
• Bone microarchitecture, biomechanical properties, and key gene expressions were analyzed.

Main Results:

• E2 supplementation effectively reversed OVX-induced bone loss and improved bone quality.
• WBVT showed partial improvements in bone microarchitecture and biomechanics but was less effective than E2.
• Combined E2+WBVT treatment did not yield greater benefits than E2 monotherapy.

Conclusions:

• WBVT alone is not as effective as E2 supplementation for treating osteoporosis in this model.
• Combining WBVT with E2 does not enhance bone-protective effects beyond E2 monotherapy.
• Further research may explore different WBVT protocols or patient populations.