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The Official Journal of the Korean Academy of Kinesiology 2009;11(3):21-30.
Published online October 30, 2009.
Estimation of 1-RM on Leg Extension and Leg Curl from Submaximal Strength and Anthropometric Variables for Adult Male
Byung-Kun Lee, Dong-Kyu Lee
Sangmyung University
Seoul National University of Education
Correspondence:  Byung-Kun Lee,
Email: bklee@smu.kr
Received: 16 August 2009   • Accepted: 10 October 2009

The purpose of this study was to develop 1-RM prediction equation of leg extension and leg curl from 7-10RM and anthropometric variables, and to verify the equation by the verify group.
Trained adult males of development group and verification group measured 1-RM, 7-10RM and anthropometric variables(development 46, verification 17). As a results of regression analysis, the 7-10RM equation of LE was “4.275 + 1.255? 7-10RM(kg)”(p<.01) and the equation of anthropometric variables was “y = -4.411 ? weight(kg)”(p<.05). The 7-10RM equation of LC was “y = 29.946 + 0.821 ? 7-10RM(kg)”(p<.01), the equation of anthropometric variables was “y = - 48.838 + 2.428 ? thigh girth(cm)”(p<.01).
There were no significant differences and high correlations(0.98~0.99, p<.01) between measured 1-RM and estimated 1-RM from 7-10RM, both in LE and LC. However, in the case of estimation from anthropometric variables, there was no significant difference only in LC, and low correlation(0.11~0.39, p>.05) was shown between measured 1-RM and estimated 1-RM. The 7-10RM equation had a good validity, but the equation of anthropometric variables had a limitation.
The satisfied 1-RM equation in both LE and LC were made from 7-10RM, but not from anthropometric variables for trained adult males.
Keywords: 1-RM, lat extension, leg curl, 7-10RM, anthropometry, estimation


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