Non-pharmacological Exercise Mimetics and Their Multisystem Health Effects: A Structured Narrative Review

Background: Regular exercise produces multisystem adaptations, yet frailty, disability and chronic disease may restrict participation. Several non-pharmacological approaches have been proposed to reproduce selected exercise-responsive pathways. Aim: To classify these approaches, examine their proposed mechanisms and appraise human evidence on organ-system effects and safety. Methods: This structured narrative review searched PubMed/MEDLINE using nine predefined concept strings, with restrictions on language (English), publication date (1990–2026) and publication type. Records underwent title, abstract and full PubMed record screening, supplemented by targeted searches. Results: From 8,082 records, 7,996 were unique; 2,735 titles and 652 abstracts were screened, and 595 records were assessed for eligibility. Seventy-nine database records and 11 targeted records were included, yielding 90 sources. Eight modalities were identified: passive heat, cold exposure, whole-body vibration, neuromuscular electrical stimulation, passive blood-flow restriction, calorie restriction and fasting, dietary bioactive compounds, and intermittent hypoxic conditioning. These modalities engage different subsets of energy-sensing, vascular, thermal, muscular and hypoxia-related pathways. Meta-analyses suggest modest improvements in blood pressure and vascular function with heat therapy, strength and falls outcomes with whole-body vibration, and muscle strength and mass with electrical stimulation. A two-year randomised trial supports improvements in cardiometabolic risk factors with calorie restriction. Evidence for several other modalities remains limited or inconsistent, and some trials reported null findings. Conclusion: These approaches are partial rather than comprehensive exercise mimetics. They may offer supervised adjunctive options for selected individuals unable to exercise, but cannot replace exercise. Larger trials with clinical outcomes and adequate safety assessment are needed.