{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T10:16:54Z","timestamp":1789726614374,"version":"4.0.1"},"reference-count":31,"publisher":"Cambridge University Press (CUP)","issue":"6","license":[{"start":{"date-parts":[[2015,8,17]],"date-time":"2015-08-17T00:00:00Z","timestamp":1439769600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":["journals.cambridge.org"],"crossmark-restriction":true},"short-container-title":["Br J Nutr"],"published-print":{"date-parts":[[2015,9,28]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This study investigated the effect of a caffeinated energy drink on various aspects of performance in sprint swimmers. In a randomised and counterbalanced order, fourteen male sprint swimmers performed two acute experimental trials after the ingestion of a caffeinated energy drink (3 mg\/kg) or after the ingestion of the same energy drink without caffeine (0 mg\/kg; placebo). After 60 min of ingestion of the beverages, the swimmers performed a countermovement jump, a maximal handgrip test, a 50 m simulated competition and a 45 s swim at maximal intensity in a swim ergometer. A blood sample was withdrawn 1 min after the completion of the ergometer test. In comparison with the placebo drink, the intake of the caffeinated energy drink increased the height in the countermovement jump (49\u00b74 (<jats:sc>sd<\/jats:sc> 5\u00b73) <jats:italic>v<\/jats:italic>. 50\u00b79 (<jats:sc>sd<\/jats:sc> 5\u00b72) cm, respectively; <jats:italic>P<\/jats:italic>&lt;0\u00b705) and maximal force during the handgrip test with the right hand (481 (<jats:sc>sd<\/jats:sc> 49) <jats:italic>v.<\/jats:italic> 498 (<jats:sc>sd<\/jats:sc> 43) N; <jats:italic>P<\/jats:italic>&lt;0\u00b705). Furthermore, the caffeinated energy drink reduced the time needed to complete the 50 m simulated swimming competition (27\u00b78 (<jats:sc>sd<\/jats:sc> 3\u00b74) <jats:italic>v.<\/jats:italic> 27\u00b75 (<jats:sc>sd<\/jats:sc> 3\u00b72) s; <jats:italic>P<\/jats:italic>&lt;0\u00b705), and it increased peak power (273 (<jats:sc>sd<\/jats:sc> 55) <jats:italic>v.<\/jats:italic> 303 (<jats:sc>sd<\/jats:sc> 49) W; <jats:italic>P<\/jats:italic>&lt;0\u00b705) and blood lactate concentration (11\u00b70 (<jats:sc>sd<\/jats:sc> 2\u00b70) <jats:italic>v.<\/jats:italic> 11\u00b77 (<jats:sc>sd<\/jats:sc> 2\u00b71) m<jats:sc>m<\/jats:sc>; <jats:italic>P<\/jats:italic>&lt;0\u00b705) during the ergometer test. The caffeinated energy drink did not modify the prevalence of insomnia (7 <jats:italic>v.<\/jats:italic> 7 %), muscle pain (36 <jats:italic>v.<\/jats:italic> 36 %) or headache (0 <jats:italic>v.<\/jats:italic> 7 %) during the hours following its ingestion (<jats:italic>P<\/jats:italic>&gt;0\u00b705). A caffeinated energy drink increased some aspects of swimming performance in competitive sprinters, whereas the side effects derived from the intake of this beverage were marginal at this dosage.<\/jats:p>","DOI":"10.1017\/s0007114515002573","type":"journal-article","created":{"date-parts":[[2015,8,17]],"date-time":"2015-08-17T06:25:15Z","timestamp":1439792715000},"page":"908-914","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":69,"title":["Acute consumption of a caffeinated energy drink enhances aspects of performance in sprint 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