Journal
NUTRIENTS
Volume 13, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/nu13092929
Keywords
protein-rich diet; endurance exercise; muscle stress; inflammation
Categories
Funding
- Almased-Wellness-GmbH
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The study suggests that protein intake can help reduce exercise-induced muscle stress responses, especially after a marathon race. Protein intake of >= 20% of total energy intake may lead to lower stress reaction levels.
The aim of this study was to determine the changes in endurance performance and metabolic, hormonal, and inflammatory markers induced by endurance stress (marathon race) in a combined strategy of training and dietary protein supplementation. The study was designed as a randomised controlled trial consisting of regular endurance training without and with a daily intake of a soy protein-based supplement over a three-month period in 2 x 15 (10 males and 5 females per group) endurance-trained adults. Body composition (body mass, BMI, and fat mass) was determined, and physical fitness was measured by treadmill ergometry at baseline and after 3 months of intervention; changes in exercise-induced stress and inflammatory markers (CK, myoglobin, interleukin-6, cortisol, and leukocytes) were also determined before and after a marathon competition; eating behaviour was documented before and after intervention by a three-day diet diary. Although no significant influence on endurance performance was observed, the protein supplementation regime reduced the exercise-induced muscle stress response. Furthermore, a protein intake of >= 20% of total energy intake led to a lower-level stress reaction after the marathon race. In conclusion, supplementary protein intake may influence exercise-induced muscle stress reactions by changing cellular metabolism and inflammatory pathways.
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