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Asian J Kinesiol > Volume 15(4); 2013 > Article
The Official Journal of the Korean Academy of Kinesiology 2013;15(4):1-12.
DOI: https://doi.org/10.15758/jkak.2013.15.4.1     Published online October 31, 2013.
Difference between Cognition and Measured Intensity of Bench Press and Squat for Weight Training Beginner and Trained Group, and the Development of 1-RM Prediction Model Based on Cognition Intensity
Byung-Kun Lee
Sangmyung University
Correspondence:  Byung-Kun Lee,
Email: bklee@smu.kr
Received: 31 August 2013   • Accepted: 19 October 2013
Abstract

INTRODUCTION
The purposes of this study were1) to compare the differences between the cognition and measured intensities in bench press and squat for weight training beginner and trained groups, to develop an estimated equation for 1-RM using the cognition intensity, and to verify the validity of the developed model.
METHODS
The subject groups were consisted of 16 beginners and 15 trained individuals. Each subject selected the cognition intensity of 60%, 75% and 90% of 1-RM without knowing the actual load that applied to the subject. The measured intensities were calculated 60%, 75% and 90% of 1-RM after 1-RM measurement. The t-test was run to analyze the significant differences between the cognition and measured intensities, and the regression analysis was applied to estimate 1-RM using the cognition intensities.
RESULTS
There was a significant difference between the cognition and the measured intensity of 60%, 75% and 90% 1-RM on both bench press and squat in the beginner group (p<.01). The cognition intensities of bench press and squat were 9.8~14.4% and 15.0~33.4%lower than the measured intensity, respectively. In case of trained group, there were also significant differences between the cognition and the measured intensity of 60% and 75% 1-RM on bench press, and those of 60%, 75% and 90% 1-RM on squat(p<.01). The cognition intensities of bench press and squat were 8.3~38.6% and 7.08~32.4% lower than the measured intensity respectively. The cognition intensities of 1-RM of beginner and trained groups showed significant differences only in the 90% intensity among 3 intensities (p<.01). Based on the regression analysis, the r of prediction for the beginner group on bench press was ranged from 0.67 to 0.84(p<.01) with the SEE of 8.70~11.95kg, and the r of prediction for the trained group was ranged from 0.66 to 0.89(p<.01) with the SEE of 5.57~10.16kg. The r of prediction for the beginner group on squat was ranged from 0.71 to 0.76(p<.01) with the SEE of 18.39~19.80kg, and the r of prediction for the trained group was ranged from 0.34 to 0.89 with the SEE of 10.94~13.50kg. Only 90% intensity exhibited significantly difference among the groups.
CONCLUSION
In the both beginner and trained groups, the cognition intensities were 7~38% lower than the measured intensities. In case of beginners, the cognition intensities of bench press and squat were 9.8~14.4% and 15.0~33.4%, respectively, lower than those of measured intensities. The cognition intensities of 1-RM of beginner and trained groups showed similar 46~52% on 60%, 58~64%on 75%, but significant differences only in the 90% intensity among 3 intensities. The significant estimation models for 1-RM were developed both for beginners and trained persons. This study also suggests that the estimation model for various age groups should be developed based on multiple motions for the future study.
Keywords: cognition intensity, measured intensity, bench press, squat, 1-RM prediction


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