[Academic Conference/Seminar Report] Endurance athletes may have higher protein requirements on non-exercise days than on exercise days! Reported at an international symposium

Ajinomoto Co., Inc. presented the results of a joint study with the University of Toronto entitled "Study on the effect of exercise on recommended protein intake in endurance athletes" at the International symposium on dietary protein for human health held in Utrecht, the Netherlands.

To date, Ajinomoto Co., Inc. and the University of Toronto have conducted joint research on the recommended protein intake for endurance athletes 1),2),3),4) and reported that the recommended daily protein intake for endurance athletes is 1.83 g/kg, which is higher than previously recommended 1).

Previous studies have shown that the recommended protein intake for endurance athletes is higher on days when they exercise (20km run). However, it was unclear whether the recommended protein intake for endurance athletes is higher on days when they do not exercise. Therefore, in this study, we improved the amino acid oxidation method that has been used so far and examined how the presence or absence of exercise on the day affects the recommended protein intake for endurance athletes. The results suggest that endurance athletes who train normally until the day before and do not exercise on the day of the experiment may require more protein than those who exercise on the day of the experiment. From these results, it is not only clear that protein and amino acids are necessary on days when they exercise, but it is also important for people who train daily to be conscious of their diet, taking into account protein and amino acids, even on days when they do not exercise. Ajinomoto Co., Inc. will continue to promote advanced research to support better competitive lives for athletes. Through such research, we will disseminate information that will lead to better nutritional suggestions for athletes and exercise enthusiasts, and contribute to the development of sports science.

Ajinomoto Co. will continue to promote cutting-edge research to support better athletic performance for athletes. Through such research, we will provide information that will lead to better nutritional suggestions for athletes and exercise enthusiasts, and contribute to the development of sports science.

1. Kato H, Suzuki K, Bannai M, Moore DR (2016) Protein Requirements Are Elevated in Endurance Athletes after Exercise as Determined by the Indicator Amino Acid Oxidation Method PLoS One 11:e0157406 doi:10.1371/journal.pone.0157406

2. Kato H, Suzukik, Bannai M and Moore DR (2018). “Branched-Chain Amino Acids Are the Primary Limiting Amino Acids in the Diets of Endurance-Trained Men after a Bout of Prolonged Exercise.” J Nutr 148(6): 925-931. 10.1093/jn/nxy048

3. Kato H, Volterman endurance KA, West DWD, Suzuki K and Moore DR (2018). “Nutritionally non- essential amino acids are dispensable for whole-body protein synthesis after exercise in athletes with an adequate essential amino acid intake.” Amino Acids 2018;50(12):1679-84. doi:10.1007/s00726-018-2639-y.

4. Williamson E, Kato H (co-first author), Volterman KA, Suzuki K, Moore DR. The Effect of Dietary Protein on Protein Metabolism and Performance in Endurance-trained Males. Med Sci Sports Exerc 2019;51(2):352-60. doi:10.1249/MSS.0000000000001791.

Related articleRelated article