{"created":"2023-05-15T11:29:08.172376+00:00","id":9800,"links":{},"metadata":{"_buckets":{"deposit":"b93b215a-0f18-4976-80cf-6ebc061c5748"},"_deposit":{"created_by":3,"id":"9800","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"9800"},"status":"published"},"_oai":{"id":"oai:chukyo-u.repo.nii.ac.jp:00009800","sets":["5:30:29:166:1005:1006"]},"author_link":["12574","12581","12576","12575","12577","12579","12580","12578"],"item_5_biblio_info_12":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2008-01-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageStart":"21-27","bibliographicVolumeNumber":"49","bibliographic_titles":[{"bibliographic_title":"中京大学体育学論叢"},{"bibliographic_title":"Research journal of physical education Chukyo University","bibliographic_titleLang":"en"}]}]},"item_5_description_11":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"It has been reported that the spin axis of a pitched baseball differs between adult pitchers and youth pitchers (Tezuka and Himeno 2001). However, that information was based on visual observation, and has not been determined quantitatively. The purpose of this study was to investigate the ball spin orientation and spin rate of youth pitchers compared with those for adult pitchers. In addition, the development of the throwing motion and factors in the determination of spin rate were discussed. Fourteen youth baseball pitchers (13.9±1.2 years) and nine collegiate baseball pitchers (20.1± 0.8 years) were selected as subjects. All of them were classified as over-hand style pitchers. The baseball was filmed immediately after the ball release using a high-speed video camera (250 Hz). The direction of spin axis and the spin rate were calculated using positional changes of drawn marks on the ball surface. The direction of the spin axis was defined by two angles, θ(azimuth) and φ(elevation). The angle between spin axis and pitching direction (α) was also obtained (Jinji and Sakurai 2006). Mean values of the angles of the spin axis showed no significant differences between youth pitchers and collegiate pitchers. As for variations within each trial, however, youth pitchers were significantly more inconsistent than collegiate pitchers. Although youth pitchers have acquired similar pitching motion to adults on average, their motion was often unstable with large variations. There was a significant difference in the mean values of spin rate between the youth pitchers and collegiate pitchers (p<0.001). Moreover, the spin rate correlated significantly with the initial ball velocity (p<0.001). Pitchers with a higher initial velocity achieved a notably higher spin rate. It was concluded that a pitching motion that increased the ball velocity consequently increased spin rate.","subitem_description_type":"Other"}]},"item_5_description_15":{"attribute_name":"表示順","attribute_value_mlt":[{"subitem_description":"4","subitem_description_type":"Other"}]},"item_5_description_16":{"attribute_name":"アクセション番号","attribute_value_mlt":[{"subitem_description":"KJ00005437401","subitem_description_type":"Other"}]},"item_5_description_8":{"attribute_name":"記事種別(日)","attribute_value_mlt":[{"subitem_description":"原著論文","subitem_description_type":"Other"}]},"item_5_description_9":{"attribute_name":"記事種別(英)","attribute_value_mlt":[{"subitem_description":"Original Article","subitem_description_type":"Other"}]},"item_5_source_id_1":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AN00081735","subitem_source_identifier_type":"NCID"}]},"item_5_source_id_19":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"02887339","subitem_source_identifier_type":"ISSN"}]},"item_5_text_6":{"attribute_name":"著者所属(日)","attribute_value_mlt":[{"subitem_text_value":"国立スポーツ科学センタースポーツ科学研究部"},{"subitem_text_value":"中京大学体育学部"},{"subitem_text_value":"中京大学大学院体育学研究科:中京大学保健センター"},{"subitem_text_value":"愛知県立蒲郡高等学校"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"神事, 努"},{"creatorName":"ジンジ, ツトム","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"12574","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"桜井, 伸二"},{"creatorName":"サクライ, シンジ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"12575","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"清水, 卓也"},{"creatorName":"シミズ, タクヤ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"12576","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"鈴木, 康博"},{"creatorName":"スズキ, ヤスヒロ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"12577","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"JINJI, Tsutomu","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"12578","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"SAKURAI, Shinji","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"12579","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"SHIMIZU, Takuya","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"12580","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"SUZUKI, Yasuhiro","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"12581","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-11-14"}],"displaytype":"detail","filename":"KJ00005437401.pdf","filesize":[{"value":"525.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"KJ00005437401.pdf","url":"https://chukyo-u.repo.nii.ac.jp/record/9800/files/KJ00005437401.pdf"},"version_id":"95bdc406-630a-4fd5-b95a-60738f986529"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"発育期の野球投手におけるボールスピンの特徴","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"発育期の野球投手におけるボールスピンの特徴"},{"subitem_title":"Characteristics of ball spin pitched by baseball pitchers in the period of development","subitem_title_language":"en"}]},"item_type_id":"5","owner":"3","path":["1006"],"pubdate":{"attribute_name":"公開日","attribute_value":"2016-11-14"},"publish_date":"2016-11-14","publish_status":"0","recid":"9800","relation_version_is_last":true,"title":["発育期の野球投手におけるボールスピンの特徴"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-05-15T14:24:00.858399+00:00"}