Effect of Chronic Endurance Exercise on Retention of Dietary Protein
Abstract
On two separate occasions, five well-trained endurance runners (VO2max = 71 +/- 5 ml/kg/min; means +/- SD) consumed a meat-free diet for 6 days. For one trial the subjects consumed the recommended dietary allowance (RDA) of protein (REC-PRO = 0.86 +/- 0.23 g/kg body wt/day). Protein intake for the other trial was 1.7 times higher (HI-PRO = 1.49 +/- 0.29 g/kg body wt/day). Each subject followed his regular training program (12-16 km running/day), and on day 5 of each diet completed a treadmill run at a similar intensity and duration (75 min at 72% VO2max). Seventy-two hour urinary urea N loss (days 4, 5, and 6 of each diet) and day 5 exercise sweat urea N excretion were measured. Serum urea N and creatinine increased significantly during the treadmill run under both dietary conditions (P less than 0.05). No significances between diet differences were observed in sweat or urinary urea N excretion; however, excretion of both tended to be higher on the REC-PRO diet than on the HI-PRO diet. The differences in protein intake combined with the nitrogen excretion measures resulted in significant differences in estimated whole-body nitrogen retention between the two treatments. Nitrogen retention (means +/- SE) remained positive during the HI-PRO trial (2.41 +/- 1.99 g/day) but was significantly (P less than 0.005) reduced to -5.29 +/- 2.58 g/day during the REC-PRO trial. These results suggest that the current protein RDA may be inadequate for athletes engaging in chronic high-intensity endurance exercise. Future studies are needed to confirm this observation.
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Optimal recovery is dependent on endurance athletes meeting their daily protein requirements.
“Secondly, in addition to meeting the requirements of glycogen resynthesis, optimal recovery is dependent on endurance athletes meeting their daily protein requirements [7]”
From International Society of Sports Nutrition Position Stand: nutritional considerations for single-stage ultra-marathon training and racing (2019) · cites this paper as [7]
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- Authors
- Friedman, J., & Lemon, P.
- Affiliations
- Kent State University (US)
- Venue
- International Journal of Sports Medicine
- Publisher
- Georg Thieme Verlag KG
- Published
- 1989-04
- Volume
- 10
- Issue
- 02
- Pages
- 118-123
- ISSN
- 0172-4622 (ISSN-L)
- 1439-3964
- OpenAlex
- W2042514113
- Cited by
- 95
- References
- 0
- Citations by year
- 2026: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 3 · 2017: 1 · 2016: 4 · 2015: 2 · 2014: 3 · 2013: 6 · 2012: 5
- FWCI
- 1.06
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Sports Medicine (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Keywords
- protein intake, nitrogen retention, endurance exercise, protein requirements, RDA, meatless diet, urinary urea nitrogen, blood urea nitrogen, creatinine, endurance runners, high-intensity exercise
- MeSH terms
- Adult, Amino Acids, Dietary Proteins, Humans, Male, Nitrogen, Physical Endurance, Running
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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