Submitted:
30 January 2026
Posted:
03 February 2026
You are already at the latest version
Abstract
Keywords:
1. Introduction
2. The Clinical Paradox: Lipedematous Dynapenia
2.1. The Illusion of Mass: Pseudo-Hypertrophy versus Functional Reality
2.2. The Failure of Standard Metrics: Why BMI Is Blind
2.3. Inflammatory Myosteatosis as a Metabolic Bottleneck
2.4. The Vicious Cycle of Pain, Inactivity, and Functional Decline
3. The Therapeutic Deadlock and a Translational, Hypothesis-Driven Pharmacological Bypass
3.1. The Exercise Paradox: Why Mechanical Loading May Fail
3.2. The Dual-Target Hypothesis: Breaking the Pathophysiological Cycle
3.2.1. Metabolic Modulation: Tirzepatide and Mitochondrial Flexibility
3.2.2. Anabolic Signaling as a Functional Rescue Analogy
4. Discussion: Translational Implications and Safety Considerations
4.1. Identifying the Functional Inflection Point
4.2. Contextualizing the Anabolic Rationale Within Evidence-Based Medicine
4.3. Safety Considerations in a Hypothesis-Driven Framework
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
| AAS | Anabolic Androgenic Steroids |
| BIA | Bioelectrical Impedance Analysis |
| BMI | Body Mass Index |
| CPT-1 | Carnitine Palmitoyltransferase 1 |
| ECM | Extracellular Matrix |
| ERα | Estrogen Receptor Alpha |
| ERβ | Estrogen Receptor Beta |
| FFM | Fat-Free Mass |
| GIP | Glucose-Dependent Insulinotropic Polypeptide |
| GLP-1 | Glucagon-Like Peptide-1 |
| HDL | High-Density Lipoprotein |
| HFpEF | Heart Failure with Preserved Ejection Fraction |
| IL-6 | Interleukin-6 |
| MRI | Magnetic Resonance Imaging |
| ROS | Reactive Oxygen Species |
| RQ | Respiratory Quotient |
| SAT | Subcutaneous Adipose Tissue |
| SIF | Italian Society of Phlebology |
| SISMES | Italian Society of Motor and Sports Sciences |
| SMM | Skeletal Muscle Mass |
| STS | Sit-to-Stand Test |
| TNF-α | Tumor Necrosis Factor Alpha |
| TUG | Timed Up and Go Test |
| UCP1 | Uncoupling Protein 1 |
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| Domain | Operational definition & assessment (examples) | Pathophysiological significance | Suggested objective endpoints |
|---|---|---|---|
| 1. Objective dynapenia (function) | Timed Up and Go (TUG) >10 s; Sit-to-Stand (5×STS or 30 s STS) below age/sex norms; handgrip or quadriceps strength below normative values (specify dynamometer and units). | Dissociation between limb volume and contractile performance, indicating failure of muscle quality rather than simple mass loss. | TUG, STS, handgrip, isokinetic quadriceps torque, gait speed, mobility-related patient-reported outcomes. |
| 2. Mechanical intolerance and refractoriness to loading | Post-exertional pain persisting >24 h; measurable limb volume increase within 24–48 h after activity; persistence of symptoms despite ≥6 months of documented conservative therapy (compression, physiotherapy, diet). | Captures the “exercise paradox,” in which inflammatory and edematous responses limit tolerance to mechanical loading and promote disuse atrophy. | Pain NRS/VAS, post-exertional symptom diary, limb volume change, pressure pain thresholds, accelerometry-based activity metrics. |
| 3. Myosteatosis and impaired muscle quality (structure) | MRI Dixon fat fraction or muscle radiodensity; ultrasound echo-intensity where advanced imaging is unavailable; sodium-MRI markers when feasible. | Links dynapenia to ectopic lipid deposition, inflammatory muscle remodeling, and reduced contractile efficiency. | Muscle fat fraction, radiodensity/echo-intensity, correlation with strength and mobility, longitudinal structural change. |
| 4. Metabolic–inflammatory milieu consistent with oxidative mismatch | Optional enrichment markers: insulin resistance indices, inflammatory cytokines, adipokines, and fibrosis/ECM-related biomarkers. | Tests the proposed lipolysis–oxidation mismatch and immunometabolic drivers sustaining myosteatosis and functional decline. | Metabolic flexibility (RQ/indirect calorimetry), insulin sensitivity, inflammatory and fibrosis-related panels, association with imaging and function. |
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