{"url":"https://whatshealthyandwhy.com/sodium-bicarbonate/athletic-performance-and-kidney-health","path":"/sodium-bicarbonate/athletic-performance-and-kidney-health","alternates":{"json":"https://whatshealthyandwhy.com/api/articles/sodium-bicarbonate/athletic-performance-and-kidney-health.json","markdown":"https://whatshealthyandwhy.com/sodium-bicarbonate/athletic-performance-and-kidney-health.md"},"topic":{"slug":"sodium-bicarbonate","name":"Sodium Bicarbonate","url":"https://whatshealthyandwhy.com/sodium-bicarbonate"},"slug":"athletic-performance-and-kidney-health","order":1,"title":"Athletic Performance and Kidney Health","question":"Does baking soda improve exercise performance and slow kidney disease?","answer":"Sodium bicarbonate probably improves high-intensity exercise lasting 30 seconds to 12 minutes, and probably slows kidney decline in CKD with acidosis.","description":"How baking soda buffers acid buildup during intense exercise and slows kidney decline in chronic metabolic acidosis","confidence":4,"confidenceNote":"Three meta-analyses and a position stand show a moderate performance gain; two CKD trials (134 and 740 patients) found slower kidney decline.","evidenceSummary":{"rctCount":2,"metaAnalysisCount":3,"totalParticipants":"870+","replicated":true,"newestStudyYear":2021},"category":{"categoryTitle":"What's Good For You","categorySlug":"good-for-you","subcategoryName":"Supplements & Vitamins","subcategorySlug":"supplements","url":"https://whatshealthyandwhy.com/explore/good-for-you/supplements"},"actions":["For hard efforts lasting 30 seconds to 12 minutes, studies used 0.2–0.3 g per kg of body weight 60–90 minutes before exercise [1][2].","Take it with a meal, or split 0.3–0.5 g/kg over the day for 3–5 days before competition, to reduce bloating and cramps [1].","With chronic kidney disease, ask your kidney doctor about bicarbonate; trials used about 1.8 g a day, guided by blood tests [5]."],"cautions":["Do not self-treat suspected kidney disease; kidney dosing needs a physician and blood bicarbonate monitoring.","People with normal kidney function have no acidosis to correct and do not need bicarbonate for kidney protection.","Common side effects are bloating, nausea and abdominal pain, and it does not raise one-rep-max strength [3]."],"simpleText":"Sodium bicarbonate — the same baking soda sitting in your kitchen — turns out to have serious science behind it as a health compound. During intense exercise, muscles generate acid that progressively shuts them down; taking sodium bicarbonate beforehand buffers that acid, helping you sustain higher effort for longer [1][2]. Separate research in people with kidney disease shows it can meaningfully slow organ decline by correcting a form of chronic low-grade acidity that quietly damages kidney tissue over time [5][6]. It is inexpensive, readily available, and one of the few over-the-counter compounds with genuine clinical trial evidence across two quite different areas of health.","mediumText":"How Acid Builds Up During Exercise\n\nDuring high-intensity effort — sprinting, cycling all-out, heavy resistance training sets — muscles rely on fast anaerobic energy pathways that produce hydrogen ions as a byproduct. As these ions accumulate, the intracellular environment becomes more acidic, progressively impairing the enzymes responsible for muscle contraction. This is a primary driver of the burning sensation and force drop-off that ends a hard effort.\n\nSodium bicarbonate (NaHCO3) raises blood pH before exercise, creating a larger extracellular buffer. Hydrogen ions can then move out of muscle cells faster, delaying the intracellular acidosis that causes fatigue. Think of it as buying more time before the chemical brake engages [1].\n\nThe International Society of Sports Nutrition, after reviewing all available evidence, concluded that supplementation improves performance in muscular endurance activities, high-intensity cycling, running, swimming, rowing, and combat sports [1]. The benefit is most consistent for efforts lasting 30 seconds to 12 minutes. Ultra-endurance events (marathons, long trail runs) rely primarily on aerobic pathways that produce far less acid, so the buffering effect matters less there.\n\nPractical Dosing for Performance\n\nThe dose used in most clinical research is 0.2–0.3 g per kilogram of body weight taken 60–90 minutes before exercise. For a 70 kg person, that is roughly 14–21 grams — about 1 to 1.5 teaspoons dissolved in water or taken with a carbohydrate-rich meal.\n\nTaking it with food is the most important practical tip. The most common complaints — bloating, nausea, abdominal cramps — are significantly reduced when sodium bicarbonate is consumed alongside a meal rather than on an empty stomach. Some athletes use a multi-day loading protocol (0.3–0.5 g/kg split into smaller doses across the day for 3–5 days before competition) to avoid any GI spike while still raising blood bicarbonate. This approach can work well for events where GI discomfort during the event would be costly.\n\nA 2020 meta-analysis found that sodium bicarbonate reliably improves muscular endurance of both small and large muscle groups but does not significantly increase maximal strength (one-rep-max type tasks) [3]. This is expected — maximal strength depends on neuromuscular factors and fast phosphocreatine energy, not acid buffering capacity.\n\nKidney Disease and Metabolic Acidosis\n\nA clinically distinct use of sodium bicarbonate involves people with chronic kidney disease. As kidney function declines, the kidneys progressively lose their ability to excrete acid and regenerate bicarbonate. The result is a slow fall in blood bicarbonate — chronic metabolic acidosis — that often isn't noticed until it is moderate to severe.\n\nThis low-grade acidosis is not benign. It accelerates kidney tissue damage, triggers protein catabolism that breaks down muscle, impairs bone metabolism, and promotes further kidney scarring. Randomized clinical trials show that correcting the acidosis with sodium bicarbonate tablets significantly slows the rate of kidney function loss and improves nutritional markers including lean body mass [5][6].\n\nThe doses used in kidney disease management are much lower than athletic doses (typically around 1.8 g/day divided across meals) and must be titrated based on blood bicarbonate monitoring. This is a medical application requiring physician involvement — it is not appropriate to self-treat suspected kidney disease.\n\nPeople with normal kidney function do not have metabolic acidosis and do not need supplemental bicarbonate for kidney protection. See the kidney stones page for related guidance on urinary pH and stone prevention.","deepText":"Evidence Review\n\nISSN Position Stand (Grgic et al., 2021)\n\nThe International Society of Sports Nutrition conducted a comprehensive review of all available evidence on sodium bicarbonate and exercise, culminating in a formal position stand [1]. Synthesizing findings from multiple systematic reviews and meta-analyses, the ISSN concluded that supplementation at 0.2–0.5 g/kg improves performance in muscular endurance activities, high-intensity cycling, running, swimming, rowing, and combat sports including boxing, judo, karate, taekwondo, and wrestling. The ergogenic effects were most consistently demonstrated for exercise lasting 30 seconds to 12 minutes, though multi-bout exercise protocols and repeated-sprint formats also showed benefit. Critically, the position stand concluded that effects are present in both men and women, and noted that chronic pre-training supplementation may enhance training adaptations — including time to fatigue and power output — beyond the acute performance bump. GI side effects (bloating, nausea, vomiting, abdominal pain) were identified as the primary barrier to consistent use, with the recommendation that food co-ingestion and multi-day loading strategies substantially mitigate these issues.\n\nMeta-Analysis of Athletic Performance (Peart et al., 2012)\n\nThis meta-analysis pooled randomized controlled trials examining sodium bicarbonate in trained versus recreationally trained athletes [2]. The overall effect size for performance improvement was moderate. A noteworthy finding was that specifically trained athletes showed significantly smaller effect sizes than recreational athletes — likely because trained athletes have more developed aerobic systems, higher natural buffering capacity, and greater tolerance for acidic environments. The study established practical protocol recommendations of 0.3 g/kg taken 60–90 minutes before exercise, which became the standard reference dose for subsequent research. The authors also noted that exercise type, duration, and intensity moderated the effect, with high-intensity anaerobic tasks showing the most consistent benefit.\n\nMuscular Endurance vs. Strength (Grgic et al., 2020)\n\nThis systematic review and meta-analysis published in Sports Medicine focused specifically on separating the effects on muscular strength from those on muscular endurance [3]. The clear finding was that sodium bicarbonate supplementation acutely improved muscular endurance of both small (forearm, hand flexors) and large (quadriceps, whole-body) muscle groups, but showed no significant ergogenic effect on maximal muscular strength (tasks involving 1–3 repetitions to failure). This distinction makes mechanistic sense: maximal strength relies primarily on the phosphocreatine system and neuromuscular factors that are not limited by acid accumulation, while endurance under repeated or sustained contractions is directly impaired by hydrogen ion buildup. This meta-analysis helps practitioners identify the populations and training contexts where sodium bicarbonate will deliver the most value.\n\nFoundational Anaerobic Meta-Analysis (Matson and Tran, 1993)\n\nThis early landmark meta-analysis examined 29 studies on sodium bicarbonate and anaerobic performance, reporting an overall effect size of 0.44 — a moderate-to-meaningful ergogenic effect [4]. At the time, individual studies showed inconsistent results, leading some researchers to dismiss bicarbonate as unreliable. The meta-analytic approach revealed that inconsistency stemmed largely from methodological differences: variation in dose, timing, exercise protocol, and failure to assess or control for GI discomfort all contributed to heterogeneous outcomes. The authors identified 0.3 g/kg as the threshold dose for consistent effects and established that timing (60–90 minutes before exercise) was critical for allowing blood bicarbonate to peak. This study built the evidentiary foundation for modern bicarbonate research protocols.\n\nLandmark CKD Bicarbonate Trial (de Brito-Ashurst et al., 2009)\n\nThis randomized 2-year trial enrolled 134 adults with stage 4–5 chronic kidney disease and metabolic acidosis (serum bicarbonate 16–20 mEq/L) [5]. Participants received oral sodium bicarbonate (600 mg tablets three times daily, approximately 1.8 g/day) or standard care. The primary finding was striking: decline in creatinine clearance was 1.88 mL/min/1.73 m² per year in the bicarbonate group versus 5.93 mL/min/1.73 m² per year in controls — a roughly three-fold difference in progression rate. Patients in the bicarbonate arm were far less likely to experience rapid progression (9% vs. 45%; relative risk 0.15) and far less likely to progress to end-stage renal disease requiring dialysis (6.5% vs. 33%; relative risk 0.13). Nutritional parameters improved as well, with significant gains in lean body mass markers. Bicarbonate supplementation was well tolerated. This single-center trial established bicarbonate correction as a disease-modifying intervention in CKD management, not merely a symptomatic treatment.\n\nUBI Study (Di Iorio et al., 2019) …","deepTruncated":true,"references":[{"id":"1","title":"International Society of Sports Nutrition position stand: sodium bicarbonate and exercise performance","authors":"Grgic J, Pedisic Z, Saunders B, Artioli GG, Schoenfeld BJ, McKenna MJ, Bishop DJ, Kreider RB, Stout JR, Kalman DS, Arent SM, VanDusseldorp TA, Lopez HL, Ziegenfuss TN, Burke LM, Antonio J, Campbell BI","year":2021,"journal":"Journal of the International Society of Sports Nutrition","pmid":"34503527","url":"https://pubmed.ncbi.nlm.nih.gov/34503527/"},{"id":"2","title":"Practical recommendations for coaches and athletes: a meta-analysis of sodium bicarbonate use for athletic performance","authors":"Peart DJ, Siegler JC, Vince RV","year":2012,"journal":"Journal of Strength and Conditioning Research","pmid":"22505127","url":"https://pubmed.ncbi.nlm.nih.gov/22505127/"},{"id":"3","title":"Effects of Sodium Bicarbonate Supplementation on Muscular Strength and Endurance: A Systematic Review and Meta-analysis","authors":"Grgic J, Rodriguez RF, Garofolini A, Saunders B, Bishop DJ, Schoenfeld BJ, Pedisic Z","year":2020,"journal":"Sports Medicine","pmid":"32096113","url":"https://pubmed.ncbi.nlm.nih.gov/32096113/"},{"id":"4","title":"Effects of sodium bicarbonate ingestion on anaerobic performance: a meta-analytic review","authors":"Matson LG, Tran ZV","year":1993,"journal":"International Journal of Sport Nutrition","pmid":"8388767","url":"https://pubmed.ncbi.nlm.nih.gov/8388767/"},{"id":"5","title":"Bicarbonate supplementation slows progression of CKD and improves nutritional status","authors":"de Brito-Ashurst I, Varagunam M, Raftery MJ, Yaqoob MM","year":2009,"journal":"Journal of the American Society of Nephrology","pmid":"19608703","url":"https://pubmed.ncbi.nlm.nih.gov/19608703/"},{"id":"6","title":"Treatment of metabolic acidosis with sodium bicarbonate delays progression of chronic kidney disease: the UBI Study","authors":"Di Iorio BR, Bellasi A, Raphael KL, Santoro D, Aucella F, Garofalo L, Ceccarelli M, Di Lullo L, Capolongo G, Di Iorio M, Guastaferro P, Capasso G","year":2019,"journal":"Journal of Nephrology","pmid":"31598912","url":"https://pubmed.ncbi.nlm.nih.gov/31598912/"}],"wordCount":1457,"source":{"path":"src/content/topics/sodium-bicarbonate/athletic-performance-and-kidney-health.md"},"citeAs":"“Does baking soda improve exercise performance and slow kidney disease?.” What's Healthy and Why. https://whatshealthyandwhy.com/sodium-bicarbonate/athletic-performance-and-kidney-health","notice":"General information backed by peer-reviewed research, not medical advice."}