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The sporting diplomacy in China, as an integral part of China’s overall diplomacy, unswervingly upholds the fundamental foreign policy goal of preserving world peace and promoting common development since New China was founded. After adopting the policy of reform and opening, the sporting diplomacy in China has made historical achievements through intensive participation in international sporting competitions, extensive involvement in international sporting organizations, active hosting of mega sports events, and frequent engagement in cultural sporting exchanges with other countries. In the last decade, with a constant increase in China’s economy, cultural soft power and international influence of sports, China makes an all-round effort in the pursuit of major countrywide sporting diplomacy with Chinese characteristics. Currently, despite the severe challenges outside China, Beijing is making smooth preparations for the 2022 Winter Olympic and Paralympic Games, which embraces another milestone in the diplomacy of sport in China. This paper analyzes decision environments, goals, actions and defining features of China’s sporting diplomacy in different periods and follows on to summarize practical experiences in the development of the sporting diplomacy in China. The paper shows that the resounding success of China’s sporting diplomacy can be attributed to its commitment to serving the country’s diplomatic strategy and core interests, its commitment to following the Chinese path of sporting diplomacy, and its commitment to the traditional Chinese value of peaceful development. Finally, emerging issues and promotion strategies are presented.

Objective There are many active ingredients in sports nutrition, and nitrate is gradually being valued by sports nutrition and product developers. Supplementation of nitrate is a practical method to increase circulating plasma nitrite, thereby increasing NO bioavailability. However, the existing research has rarely reported the dose effect between nitrate supplementation and changes in exercise efficiency and capacity. The mechanism of action of nitrate is not fully understood yet. The aim of this study was to analyze the effects of different doses of nitrate on the exercise capacity of rats, as well as the detection of [Ca2+] and calreticulin (CRT) expression in the gastrocnemius, soleus and extensor digitorum longus, trying to figure out the effects of different doses of nitrate supplementation on calcium homeostasis in different types of muscle fibers. Methods 40 SD rats (8-week-old) weighing 270-290 grams were randomly divided into control group (C group, 8), exercise control group (EC group, 8), exercise with low-dose supplementation group (ELN group, 8), exercise with medium-dose supplementation group (EMN group, 8) and exercise with high-dose supplementation group (EHN group, 8). Sodium nitrate was used as exogenous nitrate for oral gavage. The intragastric concentration was 0.3 mmol/day/kg body weight in the ELN group, 0.7 mmol/day/kg body weight in the EMN group, and 1.0 mmol/day/kg body weight in the EHN group. The others were orally administered with normal saline. All exercise groups (EC, ELN, EMN and EHN) underwent 3 days adaptive low-intensity treadmill training with slope 0°, speed 16 meter/min, and the time is 5 min, 10 min and 15 min incrementally. 24 hours after the end of the last gavage, a one-time exhaustion treadmill experiment was started. The running platform slope was -16°, the speed was 16 meter/min. Exhaustive experiment participants were not aware of the grouping of rats. Immediately after the end of exhaustive exercise, the rats were weighed and anesthetized with sodium pentobarbital solution. Blood is collected for testing [NO2-]. The gastrocnemius, soleus and extensor digitorum longus were collected for testing NOS activity, tissue [Ca2+] and CRT expression. Results (1) Compared with the EC group, the exhaustion time of the other exercise groups was prolonged. The exhaustion time of the EMN group was very significantly prolonged from that of the EC group (P0.05). (4) In the gastrocnemius, compared with the EC group, the [Ca2+] (P0.05) and the EHN vs EC group (P>0.05). (5) In the soleus, the [Ca2+] (P0.05) and the EHN vs EC group (P>0.05). (6) In the extensor digitorum longus, compared with the EC group, the [Ca2+] (P0.05). The expression of CRT in EMN group was significantly decreased (P