Information de reference pour ce titreAccession Number: | 00005768-201602000-00014.
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Author: | GONGLACH, ALEXANDER R.; ADE, CARL J.; BEMBEN, MICHAEL G.; LARSON, REBECCA D.; BLACK, CHRISTOPHER D.
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Institution: | Department of Health and Exercise Science, University of Oklahoma, Norman, OK
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Title: | |
Source: | Medicine & Science in Sports & Exercise. 48(2):287-296, February 2016.
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Abstract: | Caffeine ingestion improves endurance time trial performance. However, the ergogenic mechanism of action remains unresolved. One potential explanation for caffeine's performance-enhancing effect is an improvement in work for a given amount of muscle pain.
Purpose: To test this hypothesis, participants performed two studies in which they regulated exercise intensity based on feelings of muscle pain.
Methods: Thirteen young men were asked to regulate exercise intensity based on feelings of "moderate" muscle pain (a "3" on a 0-10 pain scale). After three familiarization trials, either caffeine (~5 mg[middle dot]kg-1 body weight) or placebo were administered before a moderate pain trial. Nine caffeine "responders" were retested and ask to regulate their exercise intensity at a "strong" pain level (a "5" on a 0-10 pain scale). A caffeine (~5 mg[middle dot]kg-1 body weight) or placebo was again ingested before exercise.
Results: Participants performed more work (P = 0.008) and covered more distance (P = 0.008) at a higher average power output (P = 0.009) and V[spacing dot above]O2 (P = 0.019), for an identical amount of "moderate" muscle pain in the caffeine condition. When exercising at a rating of a "5," caffeine did not increase total work, distance covered, or V[spacing dot above]O2 for an identical amount of "strong" pain in the nine caffeine "responders."
Conclusions: Our findings indicate caffeine increases work performed during exercise, eliciting a moderate amount of a pain. However, a threshold level of muscle pain may exist above which antagonism of adenosine receptors alone does not induce a hypoalgesic effect.
(C) 2016 American College of Sports Medicine
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Author Keywords: | EXERCISE; PERRORMANCE; ADENOSINE ANTAGONISM; HYPOALGESIA.
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Language: | English.
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Document Type: | APPLIED SCIENCES.
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Journal Subset: | Clinical Medicine. Health Professions.
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ISSN: | 0195-9131
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NLM Journal Code: | 8005433, mg8
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DOI Number: | https://dx.doi.org/10.1249/MSS.0...- ouverture dans une nouvelle fenêtre
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