Apparently healthy and free of unstable cardiovascular, neurological, or psychiatric conditions per screening.
Cleared for low-to-moderate intensity whole-body vibration delivered supine/recumbent on a mat.
Willing and able to comply with study procedures: two lab visits; 3-week home protocol (3-4 days/week); three 15-min sessions; brief affect check-ins and daily logs.
Willing to abstain from caffeine, alcohol, and strenuous exercise for 24 hours before each lab visit and to attend visits at the same time of day.
Able to lie supine for 15 minutes and follow instructions for the HRV device.
You may not be if
Implanted electronic medical devices (e.g., pacemaker, neurostimulator).
Uncontrolled hypertension or severe vestibular disorders.
Current substance dependence.
Medications known to markedly affect autonomic function or sleep architecture (e.g., beta-blockers, antiarrhythmics, sedative-hypnotics, antidepressants with strong autonomic effects).
Diagnosed neurological or psychological disorders that substantially affect emotional processing or autonomic regulation (severe psychiatric conditions).
Prior extensive experience with vibration therapies (to minimize expectancy bias).
Any condition judged by study staff to contraindicate vibration exposure or preclude safe participation (including inability to tolerate supine/recumbent position).
Unwillingness to refrain from initiating new structured exercise or relaxation programs during the study period.
