{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,22]],"date-time":"2025-11-22T16:30:20Z","timestamp":1763829020279},"reference-count":46,"publisher":"Canadian Science Publishing","issue":"1","license":[{"start":{"date-parts":[[2013,1,1]],"date-time":"2013-01-01T00:00:00Z","timestamp":1356998400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Appl. Physiol. Nutr. Metab."],"published-print":{"date-parts":[[2013,1]]},"abstract":"<jats:p> Research on the effect of caffeine on energy expenditure (EE), physical activity (PA), and total sleep time (TST) during free-living conditions using objective measures is scarce. We aimed to determine the impact of a moderate dose of caffeine on TST, resting EE (REE), physical activity EE (PAEE), total EE (TEE), and daily time spent in sedentary, light, moderate, and vigorous intensity activities in a 4-day period and the acute effects on heart rate (HR) and EE in physically active males. Using a double-blind crossover trial (ClinicalTrials.gov ID: NCT01477294) with two conditions (4 days each with 3-day washout) randomly ordered as caffeine (5 mg\/kg of body mass\/day) and placebo (maltodextrin) administered twice per day (2.5 mg\/kg), 30 nonsmoker males, low-caffeine users (&lt;100 mg\/day), aged 20\u201339, were followed. Body composition was assessed by dual-energy X-ray absorptiometry. PA was assessed by accelerometry, while a combined HR and movement sensor estimated EE and HR on the second hour after the first administration dose. REE was assessed by indirect calorimetry, and PAEE was calculated as [TEE \u2212 (REE + 0.1TEE)]. TST and daily food records were obtained. Repeated measures ANOVA and ANCOVA were used. After a 4-day period, adjusting for fat-free mass, PAEE, and REE, TST was reduced (p = 0.022) under caffeine intake, while no differences were found between conditions for REE, PAEE, TEE, and PA patterns. Also, no acute effects on HR and EE were found between conditions. Though a large individual variability was observed, our findings revealed no acute or long-term effects of caffeine on EE and PA but decreased TST during free-living conditions in healthy males. <\/jats:p>","DOI":"10.1139\/apnm-2012-0145","type":"journal-article","created":{"date-parts":[[2013,1,18]],"date-time":"2013-01-18T15:40:57Z","timestamp":1358523657000},"page":"49-56","source":"Crossref","is-referenced-by-count":14,"title":["A moderate dose of caffeine ingestion does not change energy expenditure but decreases sleep time in physically active males: a double-blind randomized controlled trial"],"prefix":"10.1139","volume":"38","author":[{"given":"Pedro B.","family":"J\u00fadice","sequence":"first","affiliation":[{"name":"Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Jo\u00e3o P.","family":"Magalh\u00e3es","sequence":"additional","affiliation":[{"name":"Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Diana A.","family":"Santos","sequence":"additional","affiliation":[{"name":"Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Catarina N.","family":"Matias","sequence":"additional","affiliation":[{"name":"Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Ana Isabel","family":"Carita","sequence":"additional","affiliation":[{"name":"Mathematical Methods Laboratory, BIOLAD-CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Paulo A.S.","family":"Armada-Da-Silva","sequence":"additional","affiliation":[{"name":"Biomechanics and Functional Morphology, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Lu\u00eds B.","family":"Sardinha","sequence":"additional","affiliation":[{"name":"Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]},{"given":"Analiza M.","family":"Silva","sequence":"additional","affiliation":[{"name":"Exercise and Health Laboratory, CIPER, Fac Motricidade Humana, Univ Tecn Lisboa, 1499-002, Cruz-Quebrada, Portugal."}]}],"member":"155","reference":[{"key":"refg1\/ref1","doi-asserted-by":"publisher","DOI":"10.1109\/IEMBS.2010.5627774"},{"issue":"6","key":"refg2\/ref2","first-page":"E1192","volume":"268","author":"Arciero P.J.","year":"1995","journal-title":"Am. 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