Importance of muscle phosphocreatine during intermittent maximal cycling
Abstract
To examine the importance of phosphocreatine (PCr) degradation in maintaining power output during maximal intermittent cycling, seven healthy men completed three bouts of isokinetic cycling (30 s, 100 revolutions/min) with 4 min of rest between bouts. After bout 2, blood flow to one leg was occluded by cuffing the thigh (Cuff) during the rest period to prevent PCr resynthesis while the circulation to the other leg was intact (Cont). The cuff was then removed and bout 3 completed. Muscle biopsies were sampled from the vastus lateralis of both legs just before and immediately after bout 3. Total work produced by the Cuff and Cont legs was similar during bouts 1 (9.3 +/- 0.5 and 9.6 +/- 0.5 kJ, respectively) and 2 (8.1 +/- 0.4 and 8.3 +/- kJ, respectively). Cuffing prevented the resynthesis of PCr because pre-bout 3 contents were 20.7 +/- 8.4 and 63.0 +/- 3.3 mmol/kg dry muscle in the Cuff and Cont legs, respectively. Cuffing also resulted in significantly higher muscle levels of lactate, H+ concentration (287 +/- 26 vs. 217 +/- 15 nM), ADP, AMP, and acetyl-CoA before bout 3 but had no effect on other glycolytic intermediates, ATP, or acetylcarnitine. Total work in bout 3 was significantly reduced by 15% in the Cuff leg (5.8 +/- 0.4 vs. 6.8 +/- 0.6 kJ). PCr degradation during bout 3 was 3.1 and 47.5 mmol/kg dry muscle in the Cuff and Cont legs, respectively, and lactate accumulation was minimal in both legs. Changes in all other metabolites during bout 3 were not different between legs. The results suggest that PCr contributed approximately 15% of the total ATP provision during the third 30-s bout of maximal isokinetic cycling and that most of the ATP was provided during the initial 15 s. Muscle glycogenolysis contributed minimally to ATP provision (approximately 10-15%) during the third 30-s bout, suggesting that aerobic metabolism becomes the dominant source of ATP during this model of repeated sprinting.
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The recovery of muscle force during repeated bouts of high-intensity exercise is linked to muscle PCr resynthesis, which is largely an O2-dependent process.
“The recovery of muscle force during repeated bouts of high-intensity exercise is linked to muscle PCr resynthesis [104,105,106], which is largely an O2-dependent process [107,108].”
From Effects of Dietary Nitrate Supplementation on Weightlifting Exercise Performance in Healthy Adults: A Systematic Review (2020) · cites this paper as [107]
Dietary NO3− supplementation has also been shown to increase muscle blood flow, which might aid muscle PCr resynthesis between sets to failure and the recovery of force and performance.
“Dietary NO3− supplementation has also been shown to increase muscle blood flow [109], which might aid muscle PCr resynthesis between sets to failure [107,108] and the recovery of force and performance [104,105,106].”
From Effects of Dietary Nitrate Supplementation on Weightlifting Exercise Performance in Healthy Adults: A Systematic Review (2020) · cites this paper as [107]
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Michailidis, Y. (2023) · Central European Journal of Sport Sciences and Medicine · doi:10.18276/cej.2023.2-05
“, 2010) and may help re-synthesize phosphocreatine (PCr) between the sets (Trump et al., 1996; Vanhatalo et al., 2011).”
BackgroundParis, N., & Gerville‐Réache, L. (2005) · Mathématiques et sciences humaines · doi:10.4000/msh.2954
- Authors
- Trump, M. E., Heigenhauser, G. J., Putman, C. T., & Spriet, L. L.
- Affiliations
- University of Guelph (CA)
- ORCID
- Spriet, L. L.
- Venue
- Journal of Applied Physiology
- Publisher
- American Physiological Society
- Published
- 1996-05-01
- Volume
- 80
- Issue
- 5
- Pages
- 1574-1580
- ISSN
- 0161-7567 (ISSN-L)
- 8750-7587
- 1522-1601
- OpenAlex
- W2268397015
- Cited by
- 92
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 2 · 2023: 3 · 2022: 3 · 2021: 4 · 2020: 6 · 2018: 5 · 2017: 3 · 2016: 1 · 2015: 5 · 2014: 3 · 2013: 6 · 2012: 3
- FWCI
- 11.54
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- phosphocreatine resynthesis, intermittent cycling, isokinetic cycling, muscle lactate, muscle pH, glycolytic intermediates, muscle glycogenolysis, aerobic metabolism, vastus lateralis, output power
- MeSH terms
- Adult, Humans, Leg, Male, Muscles, Phosphocreatine, Time Factors, Exercise
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