Keywords: Resistance Training, Aerobic Exercise, Insulin Sensitivity, GLUT4, Myokines, Longevity Medicine, Metabolic Prevention, Skeletal Muscle, Visceral Adiposity, Glycemic Control, Type 2 Diabetes
Introduction
For decades, clinical and public health messaging has emphasized aerobic exercise such as jogging, cycling, swimming as the primary exercise modality for improving glycaemic control. This recommendation was informed by robust evidence demonstrating that sustained aerobic activity increases insulin-independent glucose uptake via AMPK-mediated GLUT4 translocation, enhances mitochondrial oxidative capacity, and reduces HbA1c levels in people with T2DM. However, this focus on aerobic exercise may have inadvertently marginalized resistance training as a first-line intervention, despite a growing body of molecular and clinical evidence suggesting it may be equally, if not more effective for certain metabolic outcomes [3,5].
A pivotal study published in October 2025 in the Journal of Sport and Health Science by Yan and colleagues at the Fralin Biomedical Research Institute, Virginia Tech, provides the first rigorously controlled, direct comparison between resistance training and endurance running in a high-fat diet-induced obesity model. Their findings revealed that while both modalities improved metabolic parameters, resistance training produced significantly greater reductions in subcutaneous and visceral adiposity and superior improvements in insulin sensitivity and crucially, through molecular pathways distinct from those activated by running [2].
This review synthesizes the current molecular biology of exercise-mediated glycaemic control, situates the Yan et al. findings within a broader evidence landscape, and draws actionable implications for exercise prescription in the context of longevity medicine and preventive metabolic health. We argue that precision exercise medicine, leveraging the unique and complementary pathways of both modalities, represents the most scientifically grounded approach to metabolic disease prevention.
The Global Burden of Metabolic Disease and the Case for Exercise as Medicine
The metabolic disease pandemic encompasses not only T2DM but a spectrum of interrelated conditions like insulin resistance, central obesity, dyslipidaemia, non-alcoholic fatty liver disease, and hypertension collectively termed metabolic syndrome. Together, these conditions represent leading drivers of cardiovascular morbidity, premature mortality, and diminished health span. From a longevity medicine perspective, metabolic dysregulation is increasingly recognized as a root-cause accelerator of biological ageing, driving inflammageing, mitochondrial dysfunction, and cellular senescence [1].
Two landmark randomized controlled trials, the Diabetes Prevention Program (DPP) in the United States and the Finnish Diabetes Prevention Study, established definitively that structured lifestyle interventions combining dietary modification and physical activity can reduce the incidence of T2DM by 58% in high-risk individuals, outperforming pharmacological intervention with metformin. Physical activity was the dominant driver of risk reduction in both trials, underscoring its central role in metabolic disease prevention [17,18].
The concept of “exercise as medicine” has since gained significant traction in evidence-based medicine. A comprehensive review by Pedersen and Saltin (2015) documented the evidence base for exercise prescription across 26 chronic diseases, with T2DM featuring among the conditions with the strongest exercise-outcome relationships. Yet a critical question has remained underexplored in clinical guidelines: not simply whether to exercise, but which type of exercise optimally targets the specific metabolic pathways underlying glycaemic dysregulation and longevity determinants such as muscle mass, visceral adiposity, and systemic inflammation [7].
Physiological foundations: Skeletal Muscle as the Metabolic Governor
Skeletal Muscle and Glucose Homeostasis
Skeletal muscle accounts for approximately 80% of insulin-stimulated glucose disposal in healthy individuals and is the primary site of postprandial glucose uptake. This makes skeletal muscle the central organ in glycaemic regulation and, consequently, the primary target of both exercise modalities under review. Defects in skeletal muscle insulin signalling at the level of the insulin receptor substrate (IRS-1), phosphoinositide 3-kinase (PI3K), Akt/PKB, and TBC1D4, constitute the molecular hallmark of peripheral insulin resistance in T2DM [3,4].
Glucose entry into skeletal muscle is mediated predominantly by glucose transporter type 4 (GLUT4), an insulin-responsive transporter stored in intracellular vesicles (GSVs) that undergoes translocation to the sarcolemma upon appropriate stimulation. GLUT4 translocation can be triggered by two parallel, partially overlapping pathways: the insulin-dependent PI3K/Akt/TBC1D4 pathway, and the insulin-independent, contraction-activated AMPK/CaMKII/TBC1D1 pathway. Both pathways converge on the Rab GTPase-activating proteins TBC1D1 and TBC1D4, whose phosphorylation releases inhibitory tone on GLUT4-containing vesicle exocytosis [3,11].
GLUT4 as the Molecular Nexus of Exercise-Mediated Glycaemic Control
GLUT4 expression itself is upregulated by chronic exercise training through transcriptional mechanisms involving PGC-1α, MEF2, and the HDAC4/5 axis, pathways activated by both aerobic and resistance exercise, though through distinct upstream kinases. A single bout of exercise can acutely increase GLUT4 translocation independent of insulin, producing a post-exercise window of enhanced insulin sensitivity that can persist for 2–48 hours. Chronic training progressively increases basal GLUT4 protein content, raising the ceiling of maximal glucose transport capacity. Understanding which exercise modality most potently drives GLUT4 expression and the broader insulin signaling scaffold is therefore central to optimizing exercise prescriptions for metabolic health [3,15].
Aerobic Exercise: Established Mechanisms and Clinical Evidence
Molecular Mechanisms of Aerobic Training
Aerobic exercise (AE) activates skeletal muscle primarily through repeated calcium transient cycling and sustained energy demand, leading to AMP:ATP ratio elevation and consequent AMPK phosphorylation. Activated AMPK drives GLUT4 translocation during exercise and promotes mitochondrial biogenesis through phosphorylation of PGC-1α. Concurrently, increased intracellular calcium activates CaMKII, which contributes independently to GLUT4 translocation via TBC1D1 phosphorylation. Over weeks of training, these acute signals cumulatively upregulate mitochondrial density, oxidative enzyme capacity, and skeletal muscle capillary density, improving both peak and submaximal glucose oxidation rates [3,11].
At the systemic level, aerobic training reduces hepatic glucose output by decreasing liver lipid accumulation and improving hepatic insulin sensitivity It also drives modest reductions in visceral adipose tissue (VAT), with consequent attenuation of adipokine-driven inflammation (TNF-α, IL-6, resistin) that otherwise impairs insulin receptor signaling in peripheral tissues. These effects collectively contribute to the well-documented improvements in fasting glucose, postprandial glucose excursions, and HbA1c observed with regular aerobic training [4,5].
Clinical Evidence for Aerobic Training in T2DM
A seminal meta-analysis by Boulé et al. (2001) of 14 controlled trials demonstrated that structured aerobic exercise training reduced HbA1c by a mean of 0.66% without significant changes in body weight, independent of dietary modification. Subsequent meta-analyses have consistently confirmed HbA1c reductions of 0.5–0.8% with aerobic training programs of ≥12 weeks duration at moderate-to-vigorous intensity, with larger effects in programs incorporating ≥150 minutes of weekly exercise. These reductions are clinically significant; epidemiological data estimate that each 1% absolute reduction in HbA1c reduces the risk of diabetes-related complications including nephropathy, retinopathy, and neuropathy by 21–35% [5,7].
Limitations of Aerobic Exercise as the Sole Prescription
Despite its established efficacy, aerobic exercise faces significant real-world barriers. Endurance activities such as running place mechanical load on weight-bearing joints, making them inaccessible or contraindicated for a substantial proportion of the T2DM population particularly older adults, individuals with obesity-related osteoarthritis, and those with peripheral neuropathy or cardiovascular limitations. Moreover, purely aerobic regimens do not substantially increase muscle mass, which has independent metabolic benefits like muscle being the primary reservoir for insulin-stimulated glucose storage. The failure of aerobic exercise alone to drive meaningful hypertrophy represents a metabolic missed opportunity in the management of sarcopenic obesity, a phenotype increasingly prevalent in ageing populations with T2DM [6].
Resistance Training: Distinct Molecular Pathways and Emerging Glycaemic Superiority
Mechano-Metabolic Signaling in Resistance Exercise
Resistance training (RT) exerts its metabolic effects through a fundamentally different molecular architecture than aerobic exercise. During high-intensity muscle contractions against external resistance, the primary metabolic stress is anaerobic glycolysis within type II (fast-twitch) muscle fibres, which have disproportionately high GLUT4 content and glycogen storage capacity. Acutely, this recruits the same AMPK/TBC1D1 axis as aerobic exercise for insulin-independent GLUT4 translocation. However, chronically, resistance training activates the mechanistic target of rapamycin complex 1 (mTORC1) through IGF-1/PI3K/Akt signaling, driving muscle protein synthesis and hypertrophy [3,4].
Post-exercise, resistance training uniquely enhances insulin-stimulated glucose uptake through two mechanisms absent from aerobic training: (1) increased IRS-1 protein expression and phosphorylation capacity, improving the fidelity of insulin receptor signal transduction; and (2) expanded absolute muscle cross-sectional area, which increases the total mass of insulin-responsive tissue and therefore the total glucose storage sink. These adaptations, enhanced signaling sensitivity combined with increased metabolic mass, represent a qualitatively different insulin-sensitizing mechanism than the mitochondrial and oxidative adaptations of aerobic training [4,13].
Resistance Training and Visceral Adipose Tissue
A 2024 systematic review and network meta-analysis by Chen et al., encompassing 84 randomized controlled trials, compared the effects of aerobic exercise, resistance training, HIIT, and combined training on visceral adipose tissue (VAT) in individuals with overweight and obesity. The analysis demonstrated that all exercise modalities significantly reduced VAT, but resistance training produced reductions comparable to aerobic exercise despite involving substantially less total energy expenditure per session. Importantly, RT-mediated VAT reduction occurred even in the absence of significant changes in body weight or lean mass, suggesting unique lipolytic signaling pathways, potentially involving locally elevated catecholamines and growth hormone that are activated specifically by high-intensity mechanical loading [6,8].
A 2025 meta-analysis by Batrakoulis et al. specifically examining resistance training in middle-aged and older adults with T2DM confirmed significant improvements in HOMA-IR, fasting insulin, fasting glucose, and HbA1c, alongside reductions in systemic inflammatory markers (CRP, IL-6, TNF-α). These anti-inflammatory effects are particularly relevant from a longevity medicine perspective, as chronic low-grade inflammation drives not only metabolic deterioration but also accelerated biological ageing, cardiovascular disease, and neurodegenerative pathology [13].
Head-to-Head: Direct Comparative Evidence Between Resistance and Aerobic Exercise
The Virginia Tech “Mouse Squat” Study (Yan et al., 2025)
The study by Yan and colleagues, published in the Journal of Sport and Health Science in October 2025, represents a landmark contribution to comparative exercise physiology. Its methodological innovation lies in a novel resistance training paradigm for mice, a progressive weighted-lid cage system requiring the animals to perform squat-equivalent resistance exercise to access food, thereby enabling, for the first time, a directly controlled comparison between resistance training and voluntary wheel running under identical dietary conditions in an obese, metabolically compromised animal model [2].
Both groups were fed a high-fat diet to induce obesity-related metabolic syndrome. After the training period, the resistance-trained group demonstrated significantly greater reductions in total body fat, subcutaneous adipose tissue, and visceral adipose tissue compared to runners, despite the absence of significant differences in total exercise-related energy expenditure. Glucose tolerance testing and insulin tolerance testing confirmed superior improvements in insulin sensitivity in the resistance training cohort. Molecular analysis of skeletal muscle tissue revealed differential phosphorylation of key insulin signaling intermediates, including enhanced Akt and TBC1D4 phosphorylation in resistance-trained animals, pointing to modality-specific enhancement of post-receptor insulin signal transduction [2].
Critically, the metabolic benefits of resistance training were not explained by differences in muscle mass between groups, suggesting that the unique metabolic effects are driven by qualitative changes in muscle biochemistry rather than simply by adding more metabolically active tissue. Lead researcher Dr Zhen Yan stated: “The findings also bring good news for people who, for any number of reasons, cannot engage in endurance-type exercise. Weight training has equal, if not better, anti-diabetes benefits [2].”
Meta-Analytic Evidence and Network Analyses
Complementing the mechanistic animal data, clinical meta-analyses provide convergent evidence for the glycaemic efficacy of resistance training. A 2025 network meta-analysis evaluated multiple exercise modalities against HbA1c reduction in T2DM, finding that while high-intensity interval training (HIIT) produced the largest effect on HbA1c (−0.71%, 95% CI [−1.07; −0.35]), combined aerobic plus resistance training achieved the second-largest reduction (−0.74%, 95% CI [−0.91; −0.57]), numerically surpassing aerobic exercise alone [7,8].
A 2025 meta-analysis by Wen et al. specifically examining combined aerobic and resistance training in T2DM patients found significant reductions in HbA1c (pooled effect: −0.53; 95% CI: −0.98, −0.07; p=0.03), fasting plasma glucose, BMI, and blood pressure. Crucially, the magnitude of improvement was consistently greater in programs incorporating resistance training components than in aerobic-only programs, reinforcing the view that RT engages independent glycaemic pathways that add measurable clinical value to exercise prescriptions [12].
Myokines, Adipokines, and the Endocrine Dimension of Exercising Muscle
Skeletal Muscle as an Endocrine Organ
A conceptual revolution in muscle physiology has occurred over the past two decades with the recognition that contracting skeletal muscle secretes a diverse array of bioactive peptides, collectively termed myokines that exert autocrine, paracrine, and endocrine effects on adipose tissue, liver, pancreas, brain, bone, and immune cells. This positions skeletal muscle not merely as a passive effector of metabolic control, but as an active endocrine regulator of whole-body energy homeostasis, a “metabolic communicator” whose secretory profile is determined in part by the modality, intensity, and duration of exercise [9].
Key Myokines and Their Metabolic Roles
Interleukin-6 (IL-6), the first identified exercise-induced myokine, is released in large quantities during moderate-to-vigorous exercise from contracting myofibers. In this context, distinct from its inflammatory role in chronic disease, exercise-derived IL-6 stimulates hepatic glucose production during exercise, promotes fat oxidation, and exhibits insulin-sensitizing effects in adipose tissue [9].
Irisin, cleaved from the membrane protein FNDC5 under the transcriptional control of PGC-1α, has garnered particular attention for its metabolic effects. Irisin promotes the “browning” of white adipose tissue, inducing expression of uncoupling protein 1 (UCP1), which increases thermogenic energy expenditure and reduces lipid accumulation. Irisin also improves glucose tolerance, suppresses hepatic gluconeogenesis, and exerts neuroprotective effects relevant to the metabolic-cognitive axis in longevity medicine. A 2024 systematic review and meta-analysis confirmed that concurrent aerobic and resistance training produces the most sustained elevations in circulating irisin levels compared to either modality alone [14].
Brain-derived neurotrophic factor (BDNF), also released from contracting muscle, promotes neuronal survival and plasticity, improves hypothalamic insulin sensitivity, and suppresses appetite via central mechanisms. The myokine secretome of resistance exercise includes additional factors including meteorin-like protein, musclin, and follistatin, whose metabolic functions remain active areas of investigation but suggest a broad, systemic anti-obesogenic signaling program activated by mechanical loading that is distinct from the myokine profile of aerobic exercise [9].
Combined Training: The Multimodal Prescription for Optimal Metabolic Health
Physiological Rationale for Combined Training
The complementary molecular mechanisms of aerobic and resistance exercise provide a strong physiological rationale for combined training (CT) protocols. AE optimizes mitochondrial density and oxidative substrate utilization, while RT expands insulin-sensitive muscle mass, enhances post-receptor signaling, and reduces visceral adiposity through unique lipolytic pathways. Together, these adaptations address the metabolic pathophysiology of T2DM and insulin resistance more comprehensively than either modality alone.
From a myokine perspective, CT protocols produce a more diverse and sustained secretory response than single-modality programs, with evidence of additive or synergistic effects on irisin, IL-6, and adiponectin. At the systemic level, this translates into more pronounced attenuation of chronic low-grade inflammation, improved adipokine balance (higher adiponectin, lower leptin), and enhanced hepatic insulin sensitivity, the multi-organ metabolic benefits central to a longevity medicine approach [14].
Clinical Evidence and Sequencing Considerations
The clinical superiority of CT over either modality alone is well-supported. Meta-analyses consistently demonstrate that CT produces the greatest absolute reductions in HbA1c, fasting glucose, HOMA-IR, and body fat in individuals with T2DM. Network meta-analyses additionally show that CT achieves broad cardiovascular risk factor improvements, including blood pressure, lipid profiles, and resting heart rate that partially exceed those of single modalities, reinforcing its primacy as a treatment approach [7,8,12].
The sequencing of aerobic and resistance exercise within a single session has emerged as a clinically relevant consideration. Current evidence suggests performing resistance exercise prior to aerobic exercise (RT-AE order) may be preferable for glycaemic control, as it preserves muscle glycogen for RT performance while allowing subsequent aerobic exercise to utilize elevated circulating free fatty acids and glucose. However, this remains an area of active investigation, with individual factors including diabetes management goals, fitness level, and medication use likely modifying the optimal approach [12].
Clinical Implications for Longevity and Preventive Metabolic Medicine
Revised exercise Prescription Framework
Current guidelines from the American Diabetes Association (ADA, 2025) recommend ≥150 minutes per week of moderate-to-vigorous aerobic activity spread over at least 3 days, alongside 2–3 sessions of resistance training on non-consecutive days. The evidence reviewed here supports elevating resistance training from an optional supplement to an essential component of metabolic health prescriptions, not merely as cardiovascular risk reduction, but as a primary glycaemic and longevity intervention in its own right [2,10,13].
In clinical practice, exercise prescriptions should be individualized based on functional capacity, musculoskeletal status, cardiovascular risk, and personal preference. For patients with contraindications to high-impact aerobic exercise, including those with severe obesity, osteoarthritis, peripheral neuropathy, or fall risk, resistance training should be promoted as a primary and accessible metabolic intervention, with aerobic elements adapted to low-impact modalities (aquatic exercise, cycling, walking) [6,10].
Resistance Training as a Longevity Tool
From a longevity medicine perspective, resistance training confers benefits that extend substantially beyond glycaemic control. Progressive resistance training preserves and increases skeletal muscle mass, combating age-related sarcopenia, a key predictor of metabolic deterioration, functional decline, falls, fracture, and all-cause mortality in older adults. Resistance training also maintains bone mineral density, improves balance and coordination, reduces visceral fat accumulation independent of diet, and attenuates the inflammatory milieu driving multimorbidity in ageing populations. These multifactorial longevity benefits make resistance training a uniquely powerful preventive intervention that aerobic exercise, despite its established cardiovascular benefits, cannot fully replicate [7,13].
Precision Exercise Medicine: Toward Individualized Molecular Monitoring
An emerging frontier in longevity and preventive medicine is the use of molecular biomarkers to guide and monitor exercise prescription precision. Circulating irisin, insulin-like growth factor-1 (IGF-1), myostatin, adiponectin, and muscle-specific microRNAs are among candidate biomarkers that may reflect individual responsiveness to exercise modalities and guide the titration of RT vs. AE dosing. Wearable technology enabling continuous glucose monitoring (CGM) has already transformed patient feedback loops, allowing real-time visualization of glycaemic responses to specific exercise sessions. The integration of CGM data with exercise prescription algorithms represents a near-term clinical opportunity to personalize exercise modality, intensity, and timing for optimal glycaemic outcomes in high-risk individuals [9,14].
Limitations of Current Evidence and Future Research Directions
While the body of evidence reviewed here is compelling, several important limitations warrant consideration. The Yan et al. (2025) study, though methodologically innovative and internally rigorous, was conducted in a murine model. Rodent skeletal muscle composition, hormonal milieu, and metabolic scaling differ meaningfully from humans, and the specific molecular pathways demonstrating differential activation between modalities require validation in human exercise physiology studies. Notably, the progressive weighted-lid protocol, while elegant, approximates but does not fully replicate the neural, biomechanical, and hormonal complexity of human resistance training [2].
Meta-analyses of combined training are heterogeneous with respect to RT protocols (modality, intensity, volume, frequency), AE protocols, training duration, and participant characteristics, complicating direct comparisons across studies. Few studies have examined long-term (>12 months) adherence and outcome sustainability in structured RT programs for metabolic disease prevention, and real-world effectiveness in diverse, non-research populations remains to be fully characterized [8-12].
Future research priorities include: (1) controlled human trials directly comparing resistance training to aerobic exercise with molecular endpoint assessment (muscle biopsy, proteomics, metabolomics); (2) investigation of optimal RT dosing (frequency, intensity, volume) specifically for glycaemic outcomes in prediabetes and early T2DM; (3) mechanistic studies of the resistance training-specific myokine secretome and its systemic metabolic consequences; and (4) precision medicine trials incorporating genomic, proteomic, and CGM data to identify responder phenotypes for specific exercise modalities [2,4]
Conclusion
The prevailing clinical narrative positioning aerobic exercise as the default, superior modality for glycaemic control and metabolic disease management requires substantial revision in light of accumulating molecular and clinical evidence. The 2025 Virginia Tech comparative study by Yan et al. provides the most direct experimental confirmation to date that resistance training activates distinct, complementary, and in certain contexts superior insulin-sensitizing pathways that aerobic exercise alone does not engage. Combined with broader meta-analytic evidence showing CT superiority for HbA1c reduction and the multifactorial longevity benefits of preserved muscle mass, reduced visceral adiposity, and attenuated inflammageing, resistance training emerges as an indispensable pillar of precision metabolic medicine [2,7-9,12,13].
In the context of a global diabetes epidemic affecting nearly 590 million people and a longevity medicine paradigm that demands optimization of both health span and lifespan, the imperative is clear: exercise prescriptions for metabolic health must be multimodal, mechanistically informed, and individually tailored. The message from the evidence is not to abandon the treadmill, but to never underestimate the barbell [1].
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