Quantitative Measurement of Muscle Strength during Isotonic Weight Training: Using Quadriceps as Studied Example

• Main Authors: Shen Chia-Huei, 沈佳慧
• Other Authors: Wei Shun-Hwa
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/79091505828648186255

碩士 === 國立臺灣師範大學 === 體育學系 === 93 === Traditional muscle strength measurement is using the isotonic weight training equipments to test the one repetition maximum (1RM). However, the outcome of this method is not precise and the test processes are complicated. Thus, the purposes of current research were to establish a quantitative isotonic muscle training system, investigate the relationship between maximal voluntary isometric contraction (MVIC) and one repetition maximum (1RM) of quadriceps femoris, investigate the relationship between %MVIC and repetitions when using MVIC as reference, and determine the correlation between measured mechanical work and prescribed training volume. The subjects of this study included 14 healthy male university students (mean age=20.21) who were instructed to perform leg extension on an isotonic weight training machine. One strain gauge, a displacement sensor and a counter switch were used to collect force, displacement and repetitions data. The selected parameters were tested by the paired t-test, liner regression and Pearson product-moment correlation. P-value<0.05 was considered statistically significant. According to the results, we concluded that: (1)There was no significant correlation between MVIC and 1RM of quadriceps femoris but the P value was close to .05 (P=.07). Further more, the difference between between MVIC and 1RM of quadriceps Femoris was not significant, either. It indicated that MVIC could be used to measure the strength of quadriceps femoris. (2)When using MVIC as reference, the %MVIC and repetitions produced a regression equation as Y=36.30-40.19X (P=.00) with Y presenting the repetition and X as load. The result showed that when using MVIC as reference, the repetitions of %MVIC can be predicted. In addition, the predicted repetitions can be used to design a weight training prescription. (3)At high levels of training load (90-70%MVIC), the correlation between measured mechanical work and prescribed training volume were significant (P=.00). However, the significant correlations were not discovered in low MVIC levels (40-60%) Therefore, we concluded that the prescribed training volume can not present the real mechanical work produced by the contracting muscles when performing weight training at low level of training load and suggested that the mechanical work should be measured.