Are vibration plates safe for seniors or people with joint pain?

Many verified users and physical-therapy community threads describe relief from stiffness and arthritis-style pain, and value the low-impact nature. However, at least one beginner on r/Fitnessplates reported their back, hips, and knees hurt after first use of a high-intensity model, so reviewers recommend starting at low speeds and consulting a doctor if you have existing conditions.