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Relationship Between Isometric and Dynamic Strength in Recreationally Trained Men

Mcguigan, Michael R1,2; Newton, Michael J3; Winchester, Jason B4; Nelson, Arnold G5

Journal of Strength & Conditioning Research: September 2010 - Volume 24 - Issue 9 - pp 2570-2573
doi: 10.1519/JSC.0b013e3181ecd381
Research Note

McGuigan, MR, Newton, MJ, Winchester, JB, and Nelson, AG. Relationship between isometric and dynamic strength in recreationally trained men. Strength Cond Res 24(9): 2570-2573, 2010-The purpose of this investigation was to examine the relationships between measures of maximal isometric force (peak force [PF]), rate of force development (RFD), vertical jump performance (VJ) and 1-repetition maximum (1RM) strength in recreationally trained men. The subjects in this study were 26 men ([mean ± SD]: age 22 ± 1 years; height 175 ± 7 cm; mass 90 ± 10 kg). They were tested for PF using the isometric midthigh pull exercise. The 1RM for the squat and bench press exercise were determined as a measure of dynamic strength. Explosive strength was measured as RFD from the isometric force-time curve. Correlations between the variables were calculated using Pearson product moment correlation coefficient. There was a nearly perfect correlation between measures of PF and 1RM squat (r = 0.97, p < 0.05) and 1RM bench press (r = 0.99, p < 0.05). The correlations were very strong between VJ and PF (r = 0.72, p < 0.05) and 1RM bench press (r = 0.70, p < 0.05). There were also strong correlations between VJ and 1RM squat (r = 0.69, p < 0.05). There were no significant correlations with RFD. The results showed that isometric maximum strength determined during the isometric midthigh pull test correlated well with 1RM and VJ testing. However, RFD measured during the same test did not appear to correlate as well with other measures. The isometric midthigh pull provides an efficient method for assessing strength in recreationally trained individuals. Practioners wishing to obtain performance data related to maximum strength may wish to consider isometric testing as a less time intensive method of testing.

1New Zealand Academy of Sport North Island, Auckland, New Zealand; 2Sport Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand; 3School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Perth, Australia; 4Department of Kinesiology, Leisure, and Sport Sciences, East Tennessee State University, Johnson City, Tennessee; and 5Department of Kinesiology, Louisiana State University, Louisiana

Address correspondence to Michael R. McGuigan, mikem@nzasni.org.nz.

© 2010 National Strength and Conditioning Association