{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T16:26:11Z","timestamp":1773332771143,"version":"3.50.1"},"reference-count":50,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2026,2,14]],"date-time":"2026-02-14T00:00:00Z","timestamp":1771027200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["R01 AG058883"],"award-info":[{"award-number":["R01 AG058883"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,3,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Age-associated decline in mitochondrial oxidative capacity is associated with increased risk of disease, frailty, and disability. Oral nitrite and nitrate supplementation have been demonstrated to improve mitochondrial energetics and physical function in younger adults, but effects in older adults (age \u226570\u2009years) remain unclear.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We conducted a randomized, placebo-controlled, double-blind, two-arm trial with a parallel group design to examine the effect of 20\u2009mg sodium nitrite supplements administered three times a day for 12\u2009weeks versus placebo in older (age \u226570\u2009years) sedentary adults. Change in muscle mitochondrial respiration (complex I and II supported maximal oxidative phosphorylation [CI&amp;II MaxOXPHOS]) was the primary outcome. Platelet bioenergetics, cardiorespiratory fitness, and other physical function measures were also assessed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Sixty-four adults (75.7\u2009\u00b1\u20095.7\u2009years) completed the trial. Nitrite supplementation was not associated with improvements in skeletal muscle mitochondrial respiration, nor improvements in exercise capacity and physical function. However, platelet mitochondrial respiration changed significantly following an acute dose of oral nitrite. Notably, while nitrite levels increased 16- to 30-fold in plasma following an acute dose, levels increased only 1.6-fold in skeletal muscle.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The divergent response of skeletal muscle versus platelet mitochondrial respiration in response to nitrite supplementation suggests tissue-specific pharmacokinetics and pharmacodynamics that likely impact the efficacy of nitrite supplementation. Results also suggest there may be age-related changes in drug delivery, metabolism, and mitochondrial responsiveness compared to the effects of nitrite\/nitrate previously demonstrated in younger adults. Clinical Trial Registration Number: ClinicalTrials.gov NCT04405180<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/gerona\/glag034","type":"journal-article","created":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T12:43:56Z","timestamp":1770381836000},"source":"Crossref","is-referenced-by-count":0,"title":["Benefits of oral nitrite supplementation on mitochondrial respiration and physical function in older adults"],"prefix":"10.1093","volume":"81","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5697-2189","authenticated-orcid":false,"given":"Daniel E","family":"Forman","sequence":"first","affiliation":[{"name":"Department of Medicine, Divisions of Geriatrics and Cardiology, University of Pittsburgh, and Geriatrics, Research, Education and Clinical Center (GRECC), VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania,","place":["United 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