Cited by 343Muscle metabolism and nutritionSports Performance and TrainingBiochemical effects in animals

Creatine ingestion favorably affects performance and muscle metabolism during maximal exercise in humans

Casey, A., Constantin-Teodosiu, D., Howell, S., Hultman, E., Greenhaff, P. L.·1996·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Nine male subjects performed two bouts of 30-s maximal isokinetic cycling before and after ingestion of 20 g creatine (Cr) monohydrate/day for 5 days. Cr ingestion produced a 23.1 +/- 4.7 mmol/kg dry matter increase in the muscle total creatine (TCr) concentration. Total work production during bouts 1 and 2 increased by approximately 4%, and the cumulative increases in both peak and total work production over the two exercise bouts were positively correlated with the increase in muscle TCr. Cumulative loss of ATP was 30.7 +/- 12.2% less after Cr ingestion, despite the increase in work production. Resting phosphocreatine (PCr) increased in type I and II fibers. Changes in PCr before exercise bouts 1 and 2 in type II fibers were positively correlated with changes in PCr degradation during exercise in this fiber type and changes in total work production. The results suggest that improvements in performance were mediated via improved ATP resynthesis as a consequence of increased PCr availability in type II fibers.

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Crossref · 10.1152/ajpendo.1996.271.1.e31

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Authors
Casey, A., Constantin-Teodosiu, D., Howell, S., Hultman, E., & Greenhaff, P. L.
Affiliations
  • University of Nottingham (GB)
  • Department of Physiology and Pharmacology, University of Nottingham Medical School, Queen's Medical Center, United Kingdom.
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
1996-07-01
Volume
271
Issue
1
Pages
E31-E37
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W1880822625
Cited by
343
References
4
Citations by year
2026: 3 · 2025: 6 · 2024: 8 · 2023: 3 · 2022: 6 · 2021: 9 · 2020: 9 · 2019: 8 · 2018: 4 · 2017: 13 · 2016: 4 · 2015: 9 · 2014: 14 · 2013: 6 · 2012: 7
FWCI
3.81
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Health Sciences › Medicine › Physiology › Biochemical effects in animals
Keywords
creatine supplementation, creatine monohydrate, phosphocreatine, ATP resynthesis, muscle metabolism, work production, muscle fiber type, fast-twitch muscle, type I muscle fibers, exercise performance
MeSH terms
Adenosine Triphosphate, Administration, Oral, Adult, Bicycling, Creatine, Energy Metabolism, Humans, Male, Phosphocreatine, Physical Endurance, Muscle, Skeletal, Muscle Fibers, Skeletal

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