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The use of the isometric squat as a measure of strength and explosiveness.
J Strength Cond Res. 2015 May; 29(5):1386-92.JS

Abstract

The isometric squat has been used to detect changes in kinetic variables as a result of training; however, controversy exists in its application to dynamic multijoint tasks. Thus, the purpose of this study was to further examine the relationship between isometric squat kinetic variables and isoinertial strength measures. Subjects (17 men, 1-repetition maximum [1RM]: 148.2 ± 23.4 kg) performed squats 2 d · wk(-1) for 12 weeks and were tested on 1RM squat, 1RM partial squat, and isometric squat at 90° and 120° of knee flexion. Test-retest reliability was very good for all isometric measures (intraclass correlation coefficients > 0.90); however, rate of force development 250 milliseconds at 90° and 120° seemed to have a higher systematic error (relative technical error of measurement = 8.12%, 9.44%). Pearson product-moment correlations indicated strong relationships between isometric peak force at 90° (IPF 90°) and 1RM squat (r = 0.86), and IPF 120° and 1RM partial squat (r = 0.79). Impulse 250 milliseconds (IMP) at 90° and 120° exhibited moderate to strong correlations with 1RM squat (r = 0.70, 0.58) and partial squat (r = 0.73, 0.62), respectively. Rate of force development at 90° and 120° exhibited weak to moderate correlations with 1RM squat (r = 0.55, 0.43) and partial squat (r = 0.32, 0.42), respectively. These findings demonstrate a degree of joint angle specificity to dynamic tasks for rapid and peak isometric force production. In conclusion, an isometric squat performed at 90° and 120° is a reliable testing measure that can provide a strong indication of changes in strength and explosiveness during training.

Authors+Show Affiliations

Department of Exercise and Sport Science, East Tennessee State University, Johnson City, Tennessee.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25426517

Citation

Bazyler, Caleb D., et al. "The Use of the Isometric Squat as a Measure of Strength and Explosiveness." Journal of Strength and Conditioning Research, vol. 29, no. 5, 2015, pp. 1386-92.
Bazyler CD, Beckham GK, Sato K. The use of the isometric squat as a measure of strength and explosiveness. J Strength Cond Res. 2015;29(5):1386-92.
Bazyler, C. D., Beckham, G. K., & Sato, K. (2015). The use of the isometric squat as a measure of strength and explosiveness. Journal of Strength and Conditioning Research, 29(5), 1386-92. https://doi.org/10.1519/JSC.0000000000000751
Bazyler CD, Beckham GK, Sato K. The Use of the Isometric Squat as a Measure of Strength and Explosiveness. J Strength Cond Res. 2015;29(5):1386-92. PubMed PMID: 25426517.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The use of the isometric squat as a measure of strength and explosiveness. AU - Bazyler,Caleb D, AU - Beckham,George K, AU - Sato,Kimitake, PY - 2014/11/27/entrez PY - 2014/11/27/pubmed PY - 2015/10/29/medline SP - 1386 EP - 92 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 29 IS - 5 N2 - The isometric squat has been used to detect changes in kinetic variables as a result of training; however, controversy exists in its application to dynamic multijoint tasks. Thus, the purpose of this study was to further examine the relationship between isometric squat kinetic variables and isoinertial strength measures. Subjects (17 men, 1-repetition maximum [1RM]: 148.2 ± 23.4 kg) performed squats 2 d · wk(-1) for 12 weeks and were tested on 1RM squat, 1RM partial squat, and isometric squat at 90° and 120° of knee flexion. Test-retest reliability was very good for all isometric measures (intraclass correlation coefficients > 0.90); however, rate of force development 250 milliseconds at 90° and 120° seemed to have a higher systematic error (relative technical error of measurement = 8.12%, 9.44%). Pearson product-moment correlations indicated strong relationships between isometric peak force at 90° (IPF 90°) and 1RM squat (r = 0.86), and IPF 120° and 1RM partial squat (r = 0.79). Impulse 250 milliseconds (IMP) at 90° and 120° exhibited moderate to strong correlations with 1RM squat (r = 0.70, 0.58) and partial squat (r = 0.73, 0.62), respectively. Rate of force development at 90° and 120° exhibited weak to moderate correlations with 1RM squat (r = 0.55, 0.43) and partial squat (r = 0.32, 0.42), respectively. These findings demonstrate a degree of joint angle specificity to dynamic tasks for rapid and peak isometric force production. In conclusion, an isometric squat performed at 90° and 120° is a reliable testing measure that can provide a strong indication of changes in strength and explosiveness during training. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/25426517/The_use_of_the_isometric_squat_as_a_measure_of_strength_and_explosiveness_ L2 - https://doi.org/10.1519/JSC.0000000000000751 DB - PRIME DP - Unbound Medicine ER -