著者

野口,範子

出版者

日本運動生理学会事務局

雑誌

日本運動生理学雑誌

巻号頁・発行日

vol.10, no.1, 2003-03-31

---

There are increasing reports that the inflammatory responses induced by exercise result in generation of free radicals, reactive oxygen species (ROS), and reactive nitrogen species (RNS). These reactive molecules are known to increase oxidation products and decrease antioxidants resulting in cell damage. The roles of antioxidants in protection of our bodies from ROS-induced oxidative damage have been investigated extensively. The involvement of ROS in gene regulation has been received much attention. It has been reported that exercise induces expression of antioxidant enzymes such as Mn-superoxide dismutase (Mn-SOD) and γ-glutamylcysteine sybthetase (GCS). The regulation of these enzymes is through NF-kB pathway activated by ROSs which were produced in cell due to exercise. In conclusion, acute severe exercise may cause damage but appropriate exercise makes our body resistant against oxidative stress.

著者

角谷,雄哉

出版者

日本運動生理学会事務局

雑誌

日本運動生理学雑誌

巻号頁・発行日

vol.21, no.1, 2014-02-01

---

The velocity of absorption of dietary amino acids varies according to the type of dietary protein. Recently, blends of whey and casein protein products have been commercially appeared sports nutrition fields. However, change of plasma amino acid concentration after ingestion of blend of whey and casein protein is unclear. We hypothesized that the ingestion of an equal blend of whey and casein protein would maintain long time the plasma amino acids concentration than that of only whey protein. To examine the digestion rate of blends of two proteins, we characterized time- dependent change of plasma amino acid concentration after ingestion of it. This study consisted of three trials by double blind cross over fashion. The subjects were eight healthy people. The subjects ingested one of the 20g proteins: a whey only, a casein only, or an equal blend of whey and casein, respectively. Plasma total amino acids (TAA) indicated a significant increase at 30 min after ingestion of protein and maintained up to 60 min. At 120 min after ingestion of protein, plasma TAA also indicated a significant decrease from 90 min, and returned to the base line at 240 min. There was no significant variability of plasma amino acid concentration by types of protein on plasma TAA. As an ingestion of protein blends, area under the curve of plasma urea in male was significant lower compared with the whey protein ingestion. These findings might indicate that ingestion of blend protein probably resulted in promote postprandial protein deposition by inhibition of protein breakdown.

著者

本岡,佑子

出版者

日本運動生理学会事務局

雑誌

日本運動生理学雑誌

巻号頁・発行日

vol.17, no.2, 2010-07-31

---

The purpose of this study was to investigate the influence of physical activity on taste thresholds to obtain the knowledge for preventing voluntary dehydration. Taste thresholds were measured in 18 university student athletes (baseball players) before and after a routine training. Taste responses to sucrose (sweet), NaCl (salty), citric acid (sour) were tested. The values of detection threshold for sour were significantly decreased. The recognition threshold for salty was also significantly decreased. Otherwise recognition threshold for sweet was not significant, but prone to decrease. There was also rise in salivary pH and improvement of mood after exercise. These results indicate that taste thresholds change after physical activity. This variation of taste thresholds could be influenced by sweat loss during exercise. These results suggest that the body biotransformation caused by sweat loss may change taste thresholds after severe physical activity.