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. 2017 Mar 12:56:19-27.
doi: 10.1515/hukin-2017-0019. eCollection 2017 Feb.

Isokinetic Dynamometry and 1RM Tests Produce Conflicting Results for Assessing Alterations in Muscle Strength

Paulo Gentil  1 , Fabricio Boscolo Del Vecchio  2 , Antonio Paoli  3 , Brad J Schoenfeld  4 , Martim Bottaro  5
Affiliations

Isokinetic Dynamometry and 1RM Tests Produce Conflicting Results for Assessing Alterations in Muscle Strength

Paulo Gentil et al. J Hum Kinet. .

Abstract

The purpose of this study was to compare strength gains in the lower limbs, assessed by one maximum repetition (1RM) and isokinetic peak torque (PT), in young men undergoing a resistance training (RT) program. Twenty-seven young men performed resistance training twice a week for 11 weeks. Training involved two exercises for the lower body, two for the upper body and one for the midsection performed with three sets of 8-12 repetitions to momentary muscle failure. Before and after the training period, participants performed the 1RM test in the 45° leg press and knee extension PT in isokinetic dynamometry. The Pearson correlation coefficient was used to assess the relationship between the changes in 1RM and PT, and the Bland-Altman test was performed to check for agreement between the strength changes of both tests. There were significant changes in 1RM and PT of 23.98% and 15.96%, respectively (p < 0.05). The changes in leg press 1RM were significantly higher than the ones in PT. The Bland-Altman analysis revealed that the tests were not equivalent. In conclusion, professionals and researchers involved in strength assessment should be aware that the results obtained by PT and 1RM are not equivalent when evaluating individual responsiveness and/or the efficacy of an intervention on muscle strength, as the results obtained show large variations and can be even conflicting.

Keywords: knee extensors; lower body strength; resistance training.

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Figures

Figure 1
Figure 1
Exercises used during the training session. a) knee extension; b) seated leg press; c) sled 45° leg press
Figure 2
Figure 2
Correlation between strength gains measured by 45° leg press 1RM and knee extensors isokinetic peak torque
Figure 3
Figure 3
Bland Altman plot between changes in knee extensors isokinetic peak torque and 1RM in the sled 45° leg press
Figure 4
Figure 4
Individual gains in muscle strength measured by 45° leg press 1RM (white bars) and knee extensors isokinetic peak torque (black bars)
See this image and copyright information in PMC

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References

    1. Abernethy PJ, Jurimae J.. Cross-sectional and longitudinal uses of isoinertial, isometric, and isokinetic dynamometry. Med Sci Sports Exerc. 1996;28:1180–1187. - PubMed
    1. Artero EG, Lee DC, Lavie CJ, Espana-Romero V, Sui X, Church TS, Blair SN.. Effects of muscular strength on cardiovascular risk factors and prognosis. J Cardiopulm Rehabil Prev. 2012;32:351–358. - PMC - PubMed
    1. Bland JM, Altman DG.. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet. 1986;1:307–310. - PubMed
    1. Brown LE.. Champaing: Human Kinetics. Isokinetics in Human Performance. 2000
    1. Brown LE, Weir JP.. Procedures recommendation I: accurate assessment of muscular strength and power. J Exerc Physiol. 2001;4:1–21.

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