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Most rule sets for mixed martial arts competitions have evolved since the early days of vale tudo. As the knowledge about fighting techniques spread among fighters and spectators, it became clear that the original minimalist rule systems needed to be amended. As rules evolved and regulations added, different branches of mixed martial arts have emerged, with differences between the different rulesets dictating different strategies. Similarly, shoot wrestling organizations, such as Shooto, expanded their rulesets to integrate elements of vale tudo into their sport. However, for the most part, fighters accustomed to one rule set can easily acclimate to a different ruleset, as the basics of fighting remain largely the same. The most prevalent rule set in the world being used currently is the ''Unified Rules of Mixed Martial Arts'', adopted by all state athletic commissions in the United States that regulate mixed martial arts and is used most notably in the Ultimate Fighting Championship. The Unified Rules are the ''de facto'' rules for mixed martial arts in the United States, and have been adopted by other promotions and jurisdictions worldwide. Other notable sets include Shooto's, which were the first to mandate padded gloves, and Pride rules, after PRIDE Fighting Championships, which were also adopted by other promotions worldwide. ==Evolution== Some main motivations for these rule changes included: * Protection of the health of the fighters: This goal was partially motivated to clear the stigma of "barbaric, no rules, fighting-to-the-death" matches that MMA obtained because of its vale tudo and no holds barred roots. It also helps athletes avoid injuries which would otherwise hamper the training regimens that improve skill and ability and lead to better fights in the future. * Providing spectacle for spectators. Weight classes emerged when knowledge about submission holds spread. When more fighters became well-versed in submission techniques and avoiding submissions, differences in weight became a substantial factor. Headbutts were prohibited because it was a technique that required little effort and could quickly turn the match into a bloody mess. Headbutting was common among wrestlers because their skill in takedowns allowed them to quickly transfer bouts to the ground where they could assault opponents with headbutts while not being required to alter their position. Small, open-finger gloves were introduced to protect fists in punches while still allowing for effective grappling. Gloves were first mandatory in Japan's Shooto league, but are now mandatory in matches for nearly every promotion. Although some fighters may have well conditioned fists, others may not. The small bones in an unprotected and unconditioned fist are prone to break when it hits a torso or forehead with power. Gloves also reduce the occurrence of cuts (and stoppages due to cuts) and encourage fighters to use their hands for striking, both of which enable more captivating matches. Time limits were established to avoid long fights on the ground with little perceivable action. No time limit matches also complicated the airing of live events. Similar motivations produced the "stand up" rule, where the referee can stand fighters up if it is perceived both are resting on the ground or are not advancing toward a dominant position. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mixed martial arts rules」の詳細全文を読む スポンサード リンク
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