Research on Exercise & Strength
Why resistance training is metabolic medicine — Wolfe, Westcott, Strasser, Phillips on protein for athletes, Schoenfeld on volume.
15
Papers
7
Strong evidence
06–24
Years covered
Where this literature sits
Resistance training is the single most consequential intervention for metabolic and longevity outcomes after smoking and diet. Wolfe's 2006 AJCN review framed muscle as the primary site of glucose disposal and amino-acid reservoir — losing muscle is losing metabolic real estate. Strasser & Pesta 2013 showed RT improves insulin sensitivity by ~30% via increased GLUT4 translocation.
Schoenfeld's volume meta-analyses establish the dose-response: hypertrophy scales with weekly sets per muscle, plateauing around 20. Phillips's protein-for-athletes work (2011) puts the practical target at 1.2–2.0 g/kg, distributed across 3–4 meals. Cermak's 2012 meta-analysis confirmed protein supplementation augments resistance-training adaptations.
The Fragala 2019 NSCA position is unambiguous for older adults. Below: the strength-training literature.
Evidence mix on this topic
- Strong evidence7
- Moderate evidence8
Every paper behind the claim
Filter by grade or flip the order. Each card links straight to PubMed, the DOI or the journal — read the original rather than our summary of it.
- Moderate evidence2024
Body composition and cardiometabolic effects of GLP-1 receptor agonists: changes in lean mass
Linge J et al. · Obesity Reviews
Across GLP-1 trials, ~25–40% of total weight lost on semaglutide is lean mass — meaningful sarcopenia risk.
- Moderate evidence2024
Bone health after exercise alone, GLP-1 receptor agonist treatment, or combination treatment
Jensen SBK et al. · JAMA Network Open
GLP-1 monotherapy reduced bone mineral density at hip and spine; exercise prevented this loss.
- Moderate evidence2023
International society of sports nutrition position stand: nutritional concerns of the female athlete
Sims ST et al. · Journal of the International Society of Sports Nutrition
Female athletes need attention to RED-S risk, iron status, and protein timing across the menstrual cycle.
- Moderate evidence2023
Bone health management in midlife women
Papadakis GE et al. · BMJ
Midlife women lose ~1–2% bone density yearly across the menopause transition; resistance training and protein blunt loss.
- Strong evidence2019
Resistance Training for Older Adults: Position Statement From the National Strength and Conditioning Association
Fragala MS et al. · Journal of Strength and Conditioning Research
NSCA position: resistance training for older adults preserves strength, mobility, bone density, and metabolic health.
Exercise & StrengthSource ↗ - Strong evidence2018
A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults
Morton RW et al. · British Journal of Sports Medicine
Meta-analysis: protein supplementation augments resistance-training muscle gains up to ~1.6 g/kg/day plateau.
Exercise & StrengthSource ↗ - Strong evidence2017
Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis
Schoenfeld BJ, Ogborn D, Krieger JW · Journal of Sports Sciences
Hypertrophy scales with weekly sets per muscle (≥10 weekly sets > <5); plateaus around 20 sets/week.
Exercise & StrengthSource ↗ - Moderate evidence2016
Protein 'requirements' beyond the RDA: implications for optimizing health
Phillips SM, Chevalier S, Leidy HJ · Applied Physiology, Nutrition, and Metabolism
RDA (0.8 g/kg) is a floor for nitrogen balance; optimal for ageing, body composition, satiety is 1.2–1.6 g/kg.
- Moderate evidence2013
Resistance training for diabetes prevention and therapy: experimental findings and molecular mechanisms
Strasser B, Pesta D · BioMed Research International
Resistance training improves insulin sensitivity ~30% via increased muscle mass and GLUT4 translocation.
- Moderate evidence2012
Resistance training is medicine: effects of strength training on health
Westcott WL · Current Sports Medicine Reports
Review of resistance training as primary intervention for sarcopenia, glycemic control and bone density.
Exercise & StrengthSource ↗ - Strong evidence2012
Protein supplementation augments the adaptive response of skeletal muscle to resistance-type exercise training: a meta-analysis
Cermak NM et al. · American Journal of Clinical Nutrition
Protein supplementation augments lean mass and strength gains from resistance training across diverse populations.
- Strong evidence2012
Effect of dietary protein content on weight gain, energy expenditure, and body composition during overeating
Bray GA et al. · JAMA
Inpatient overfeed: low-protein groups gained more fat and less lean mass than normal/high-protein at matched calories.
- Strong evidence2011
Dietary protein for athletes: from requirements to optimum adaptation
Phillips SM, Van Loon LJC · Journal of Sports Sciences
Recommends 1.2–2.0 g/kg protein for athletes; spreads protein across 3–4 meals to maximize MPS.
- Moderate evidence2010
Achieving hunter-gatherer fitness in the 21st century: back to the future
O'Keefe JH et al. · American Journal of Medicine
Recommends modeling activity on hunter-gatherer movement patterns: walking, intermittent intensity, recovery.
- Strong evidence2006
The underappreciated role of muscle in health and disease
Wolfe RR · American Journal of Clinical Nutrition
Foundational review of muscle as the primary site of glucose disposal and amino-acid reservoir for metabolic health.
Exercise & StrengthSource ↗
Nothing metabolic sits on its own
Sleep moves insulin. Stress moves visceral fat. Protein moves total intake. The other shelves in the library are usually where the missing half of the answer lives.
- Ultra-Processed Food8 studies
- Metabolic Adaptation8 studies
- GLP-1 Drugs8 studies
- Insulin Resistance14 studies
- Fasting6 studies
- Seed Oils7 studies
- Ancestral Diet7 studies
- Sleep & Circadian9 studies
- Women-Specific9 studies
- Gut Microbiome8 studies
- Protein Leverage9 studies
- Heart Disease12 studies
- Glucose Variability7 studies
- Cortisol & Stress8 studies
Exercise & Strength
Reading this evidence honestly
Of the 15 papers filed under this topic, 7 carry a strong-evidence grade — replicated trials or large meta-analyses — and 0 sit in the contested or mechanism-only tiers where the human outcome has not been settled.
A mixed distribution is normal and honest. Topics where every paper is graded strong are usually topics where the inconvenient papers have been quietly left out.
7 of 15 papers
8 of 15 papers
Evidence grades describe the strength of the research, not a promise about your outcome.
Papers describe populations. Your labs describe you.
The free assessment takes the research above and asks which parts of it apply to your pattern — then names the protocol the evidence actually supports for it.
Educational only, not medical advice. Citing a study is not a recommendation to act on it. Consult your physician before major dietary changes or altering prescribed medication. These statements have not been evaluated by the Food and Drug Administration. Individual results vary; no outcome is guaranteed.