How Fast Do You Lose Muscle? Detraining and Muscle Memory @BarbellMedicine

Uploaded July 2026 | Updated September 2026, 2 weeks ago

Stop training and what goes first, how fast? We separate real detraining from just being busy, explain why strength fades before size, and get into muscle memory: why your gains come back faster than you built them.

Chapters:
0:00 Why the rate depends on the cause
1:12 Immobilization: how fast you lose it
2:55 Bed rest and illness
5:38 What you lose, and in what order
6:57 Muscle memory: why it comes back

Resources

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Enhanced Games results, AP News, 25 May 2026. apnews.com/article/enhanced-games-kerley-doping-ee1ad0ff82d30b3ff38728a35198fc83

Bhasin S, et al. Supraphysiologic testosterone and muscle size and strength. N Engl J Med. 1996. pubmed.ncbi.nlm.nih.gov/8637535

Warrier AA, et al. Performance-enhancing drugs in healthy athletes: an umbrella review. Sports Health. 2024. pubmed.ncbi.nlm.nih.gov/37688400

ACSM. Resistance Training Prescription... An Overview of Reviews. Med Sci Sports Exerc. 2026. acsm.org/resistance-training-guidelines-update-2026

Morton RW, et al. Neither load nor systemic hormones determine RT hypertrophy or strength in trained men. J Appl Physiol. 2016. pubmed.ncbi.nlm.nih.gov/27174923

Vieira AF, et al. Failure vs not to failure for strength, hypertrophy, power: meta-analysis. J Strength Cond Res. 2021. pubmed.ncbi.nlm.nih.gov/33555822

Refalo MC, et al. Proximity-to-failure and hypertrophy: meta-analysis. Sports Med. 2023. doi.org/10.1007/s40279-022-01784-y

Borde R, et al. Dose-response of resistance training in healthy old adults: meta-analysis. Sports Med. 2015. pubmed.ncbi.nlm.nih.gov/26420238

Cadore EL, et al. Sets to failure vs not in elderly men: randomized trial. Exp Gerontol. 2018. pubmed.ncbi.nlm.nih.gov/29577974

Helms ER, et al. Small vs large energy surplus in resistance-trained individuals. Sports Med Open. 2023. link.springer.com/article/10.1186/s40798-023-00651-y

Longland TM, et al. Higher protein during energy deficit with intense exercise. Am J Clin Nutr. 2016. pubmed.ncbi.nlm.nih.gov/26817506

STEP 1 body-composition substudy (semaglutide). J Endocr Soc. 2021. academic.oup.com/jes/article/5/Supplement_1/A16/6240360

SURMOUNT-1 body-composition substudy (tirzepatide). Diabetes Obes Metab. 2025. dom-pubs.onlinelibrary.wiley.com/doi/10.1111/dom.16275

Forbes SC, et al. Creatine and resistance training on lean tissue and strength in older adults: meta-analysis. Nutrients. 2021. ncbi.nlm.nih.gov/pmc/articles/PMC8229907

Ding P, et al. GLP-1 receptor agonists and risk of paralytic ileus: Mendelian randomization. medRxiv 2024 (preprint, not peer reviewed). doi.org/10.1101/2024.10.17.24315627

Pelland JC, et al. Resistance training dose response: volume and frequency meta-regressions. Sports Med. 2026. pubmed.ncbi.nlm.nih.gov/41343037

Schoenfeld BJ. Mechanisms of muscle hypertrophy. J Strength Cond Res. 2010. pubmed.ncbi.nlm.nih.gov/20847704

Nuell S, et al. Hamstring muscle volume and sprint performance. J Strength Cond Res. 2021. pubmed.ncbi.nlm.nih.gov/33555833

Sanchis-Moysi J, et al. Muscle hypertrophy in prepubescent tennis players (MRI). PLoS One. 2012. pubmed.ncbi.nlm.nih.gov/22428074

Wang R, et al. Variable-resistance vs constant-resistance training and maximum strength: meta-analysis. IJERPH. 2022. pmc.ncbi.nlm.nih.gov/articles/PMC9317775

Retraction notice, Soria-Gila MA, et al. Variable resistance training on maximal strength. J Strength Cond Res. 2018. pubmed.ncbi.nlm.nih.gov/30540286

Haugen ME, et al. Free-weight vs machine-based training: meta-analysis. BMC Sports Sci Med Rehabil. 2023. pubmed.ncbi.nlm.nih.gov/37582807

Aune D, et al. Fruit and vegetable intake and mortality: dose-response meta-analysis. Int J Epidemiol. 2017. doi.org/10.1093/ije/dyw319

Ding EL, et al. SHBG and risk of type 2 diabetes. N Engl J Med. 2009. nejm.org/doi/full/10.1056/NEJMoa0804381

Vermeulen A, et al. Estimation of free testosterone in serum. J Clin Endocrinol Metab. 1999. academic.oup.com/jcem/article/84/10/3666/2660660

Bhasin S, et al. Testosterone therapy in men with hypogonadism: Endocrine Society guideline. J Clin Endocrinol Metab. 2018. academic.oup.com/jcem/article/103/5/1715/4939465

Coleman KJ, et al. Initial validation of an exercise vital sign in EMRs. Med Sci Sports Exerc. 2012. pubmed.ncbi.nlm.nih.gov/22688832

Sallis JF, et al. Physical activity assessment, prescription and referral in US healthcare (It's Time to Move). Prog Cardiovasc Dis. 2021. pubmed.ncbi.nlm.nih.gov/33383058

How Fast Do You Lose Muscle? Detraining and Muscle Memory

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$On a low-protein diet? Thats exactly when to lift. These are often older patients already losing muscle, and strength and physical function predict who stays independent, who avoids a fall and a fracture, and who lives longer better than almost any number on a lab report. Push their protein down to protect a lab value and you can speed up the muscle loss that shapes the rest of their life. So if someone truly has to restrict protein, thats exactly the person who should be lifting. A 2001 trial out of Tufts put older kidney patients on a low-protein diet and had half of them do resistance training. The ones who trained built muscle and got stronger on that same restricted diet. The ones who only dieted lost strength.$

$Body Composition, Bone, Brain, & the Fitness Changes (Data vs the Influencers) I Menopause Part 3 Most women in 2026 are told menopause affects everything, the weight, the belly fat, the bones, the heart, the brain, and that the fix is hormones, supplements, and a proprietary protocol. The data tell a different story. Menopause does some of it, but not all of it. Dr. Jordan Feigenbaum and Dr. Austin Baraki — with OB-GYN Dr. Loraine Baraki at the clinical changes — put real numbers on what menopause actually does to body composition, cardiometabolic healh around the final menstrual period, bone, cognition, and sleep. Then the single biggest modifiable lever against what actually kills postmenopausal women — which isnt a hormone. This is Episode 3 of Barbell Medicines four-part menopause series. TIMESTAMPS 01:23 Intro 02:45 Body composition & the SWAN study 04:16 How much weight gain is really menopause? 06:55 The answer: about 1.5 kg 08:14 Subcutaneous vs visceral fat 11:08 Why waist beats weight (and body-fat %) 17:21 Does menopause crash your metabolism? 19:02 Clinic: MHT for body composition 23:51 Dr. Loraine Baraki — MHT, weight & testosterone 27:29 The cardiometabolic shift: cholesterol at the FMP 30:18 Insulin resistance & metabolic syndrome 33:12 Blood pressure & 10-year heart risk 34:54 Clinic: the estrogen crisis lipid panic 39:13 Bone: the advice vs the data 40:34 Why DXA misses most fractures 41:24 LIFTMOR: lifting heavy with low bone density 44:47 The LIFTMOR results 46:53 Lifting vs Pilates, and falls 52:17 Clinic: Should I be deadlifting? 56:14 Cognition & brain fog 57:50 Why brain fog is mostly a sleep problem 59:17 Clinic: brain fog, night sweats, broken sleep 1:03:06 Depression & dementia in midlife 1:05:43 Does hormone therapy protect the brain? 1:08:53 Clinic: Am I getting early dementia? 1:13:19 Dr. Loraine Baraki — the timing hypothesis & the brain 1:16:15 What actually kills postmenopausal women 1:17:31 Fitness: the biggest mortality lever 1:20:21 Strength, power & grip 1:25:15 Clinic: where to start when youre overwhelmed 1:30:41 The detraining problem 1:32:38 Trained vs untrained: whats recoverable 1:34:53 The actual plan 1:39:48 Takeaways RESOURCES Subscribe to BBM Plus: https://barbellmedicine.supercast.com/ Coaching & templates: https://www.barbellmedicine.com/ STUDIES Greendale, SWAN body composition: https://doi.org/10.1172/jci.insight.124865 Lovejoy, visceral fat in the transition: https://doi.org/10.1038/ijo.2008.25 Pontzer, energy expenditure across life: https://doi.org/10.1126/science.abe5017 Karppinen, metabolism in midlife women: https://doi.org/10.1093/eurjpc/zwad177 Matthews, lipids & the transition: https://doi.org/10.1016/j.jacc.2009.10.009 Janssen, menopause & metabolic syndrome: https://doi.org/10.1001/archinte.168.14.1568 El Khoudary, AHA statement on midlife women: https://doi.org/10.1161/CIR.0000000000000912 Greendale, SWAN bone loss: https://doi.org/10.1002/jbmr.534 Siris, low BMD & fractures (NORA): https://doi.org/10.1001/jama.286.22.2815 Watson, LIFTMOR: https://doi.org/10.1002/jbmr.3284 Kemmler, EFOPS 16-year: https://doi.org/10.1097/GME.0000000000000720 Kistler-Fischbacher, MEDEX-OP: https://doi.org/10.1002/jbmr.4334 Sherrington, exercise & falls (Cochrane): https://doi.org/10.1002/14651858.CD012424.pub2 Greendale, SWAN cognition: https://doi.org/10.1212/WNL.0b013e3181a71193 Kravitz, sleep in midlife women: https://doi.org/10.1016/j.ogc.2018.07.008 Cohen, Harvard Moods & Cycles: https://doi.org/10.1001/archpsyc.63.4.385 Bromberger & Kravitz, mood & menopause (SWAN): https://doi.org/10.1016/j.ogc.2011.05.011 Livingston, Lancet Commission on dementia: https://doi.org/10.1016/S0140-6736(24)01296-0 Shumaker, WHIMS (estrogen+progestin): https://doi.org/10.1001/jama.289.20.2651 Espeland, WHIMS (estrogen-alone): https://doi.org/10.1001/jama.291.24.2959 Gleason, KEEPS-Cog: https://doi.org/10.1371/journal.pmed.1001833 Henderson, ELITE: https://doi.org/10.1212/WNL.0000000000002980 USPSTF, HT for primary prevention: https://doi.org/10.1001/jama.2022.18625 Mandsager, fitness & mortality: https://doi.org/10.1001/jamanetworkopen.2018.3605 Kodama, fitness & mortality meta-analysis: https://doi.org/10.1001/jama.2009.681 Momma, muscle-strengthening & mortality: https://doi.org/10.1136/bjsports-2021-105061 Araújo, power vs strength & mortality (CLINIMEX): https://doi.org/10.1016/j.mayocp.2025.02.015 Leong, grip strength & mortality (PURE): https://doi.org/10.1016/S0140-6736(14)62000-6 Troiano, accelerometer activity: https://doi.org/10.1249/mss.0b013e31815a51b3 Fleg, aerobic-capacity decline (BLSA): https://doi.org/10.1161/CIRCULATIONAHA.105.545459 Janssen, skeletal muscle mass across adulthood: https://doi.org/10.1152/jappl.2000.89.1.81 Pollock, master athletes & aerobic capacity: https://doi.org/10.1152/jappl.1987.62.2.725 Latella, strength across ages in powerlifters: https://doi.org/10.1007/s40279-023-01962-6$