Related Experiment Video
Updated: Feb 3, 2026
08:56
Estrogen-Like Effect of Bazi Bushen Capsule in Ovariectomized Rats
Published on: April 7, 2023
1.3K
Mechanical Vibration Associated With Intermittent PTH Improves Bone Microarchitecture in Ovariectomized Rats
Jenifer Freitas Campos1, Aline Gomes Hidalgo Mierzwa1, Mariana Freitas-Jesus1
1Department of Morphology and Genetics, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
Summary
Mechanical vibration (MV) enhanced the bone-forming effects of intermittent parathyroid hormone (iPTH) therapy in rats. However, MV did not maintain bone mass after iPTH treatment ended.
Area of Science:
- Bone biology and osteoporosis research
- Mechanobiology and therapeutic interventions
- Endocrinology and metabolic bone disease
Background:
- Intermittent parathyroid hormone (iPTH) is a bone-forming therapy for severe osteoporosis, limited to 24 months.
- Antiresorptive drugs are required post-iPTH to preserve newly formed bone tissue.
- Mechanical load, particularly vibration, shows potential for preventing bone loss.
Purpose of the Study:
- To assess if whole-body mechanical vibration (MV) can enhance iPTH's anabolic effects.
- To determine if MV can inhibit bone resorption after iPTH treatment cessation in estrogen-deficient rats.
Main Methods:
- Ovariectomized (OVX) and sham-operated rats were used, divided into seven treatment groups.
- Treatments included vehicle, MV alone, iPTH alone, iPTH combined with MV, and sequential iPTH and MV.
- Bone mineral density (BMD), body composition, histomorphometry, and biomechanical properties were analyzed.
Main Results:
- Mechanical vibration (MV) potentiated the anabolic effects of intermittent parathyroid hormone (iPTH) on cancellous bone.
- BMD increased in all iPTH-treated groups; PTH+MV showed the highest bone volume (BV/TV).
- Vibration applied after iPTH treatment improved tibial bone strength but did not maintain overall bone mass.
Conclusions:
- Mechanical vibration can amplify the bone-building effects of iPTH.
- Mechanical vibration alone is insufficient to maintain bone mass after iPTH treatment discontinuation in this model.
- Combined or sequential therapies warrant further investigation for osteoporosis management.
Keywords:
Bone densitometrybone histomorphometryintermittent PTHmechanical vibrationovariectomized ratsMore Related Videos
Related Concept Videos
01:19Vibrating Concrete
399
Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
399
01:24IR Spectroscopy: Molecular Vibration Overview
4.7K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
4.7K
01:24Drug Accumulation During Multiple Dosing: Intermittent IV Infusions
255
Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
255
01:16IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
2.9K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
According to Hooke's law, the vibrational frequency is directly proportional to...
2.9K
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.8K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.8K
03:06Reaction Mechanisms
30.8K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
30.8K