{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T16:41:20Z","timestamp":1789663280240,"version":"4.0.1"},"reference-count":88,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,12,24]],"date-time":"2024-12-24T00:00:00Z","timestamp":1734998400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Human Nutrition Diet"],"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Modern elite football places extremely high demands on the athlete's body, so it is of practical interest to study the effect of various dietary supplements on load tolerance and postexercise recovery. Furthermore, there is a lack of research on the effects of caffeine on key measures of load tolerance in football such as delayed\u2010onset muscle soreness (DOMS), rate of perceived exertion (RPE) and heart rate (HR) at different time points after the exercise.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>54 young players aged 15\u201317 years from a leading Russian football academy took part in a randomised trial using the balanced placebo design. They were divided into 4 groups: 1 \u2013 told caffeine\/given caffeine, 2 \u2013 told caffeine\/given placebo, 3 \u2013 told placebo\/given placebo and 4 \u2013 told placebo\/given caffeine. All participants consumed two capsules 60\u2009min before testing, each containing 200\u2009mg of caffeine or placebo. Sprinting, counter\u2010movement jump, change of direction run, dribbling, T\u2010test and the repeated sprint ability test were used to create conditions for high\u2010intensity sports\u2010specific load. A visual analogue scale was used to assess the severity of muscle soreness. RPE was assessed using the Borg Rating of Perceived Exertion scale. HR immediately postexercise (HRpe), HR after 2 min of passive rest (HRrest) and recovery HR (HRrec = HRpe \u2212 HRrest) were obtained.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The data demonstrated that a single caffeine intake of 400\u2009mg had no statistically significant effect on RPE (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.948), HRpe (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.698) or HRrec (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.920) across the groups. Additionally, the severity of DOMS 24\u2009h postexercise did not differ significantly between the groups (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.077).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Acute caffeine ingestion does not affect the subjective and objective indicators of training load in young football players aged 15\u201317 years with low levels of anxiety and low levels of daily caffeine intake.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jhn.70002","type":"journal-article","created":{"date-parts":[[2024,12,24]],"date-time":"2024-12-24T09:24:04Z","timestamp":1735032244000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Influence of Caffeine on Tolerance to Sport\u2010Specific High\u2010Intensity 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