Assessing Muscle-Strength Asymmetry via a Unilateral-Stance Isometric Midthigh Pull

作者：Dos'Santos Thomas^*; Thomas Christopher; Jones Paul A; Comfort Paul

来源：International Journal of Sports Physiology and Performance, 2017, 12(4): 505-511.

DOI：10.1123/ijspp.2016-0179

• peak force
• impulse
• imbalance
• reliability

Purpose: To investigate the within-session reliability of bilateral- and unilateral-stance isometric midthigh-pull (IMTP) force-time characteristics including peak force (PF), relative PF, and impulse at time bands (0-100, 0-200, 0-250, and 0-300 milliseconds) and to compare isometric force-time characteristics between right and left and dominant (D) and nondominant (ND) limbs. Methods: Professional male rugby league and multisport male college athletes (N = 54; age, 23.4 +/- 4.2 y; height, 1.80 +/- 0.05 m; mass, 88.9 +/- 12.9 kg) performed 3 bilateral IMTP trials and 6 unilateral-stance IMTP trials (3 per leg) on a force plate sampling at 600 Hz. Results: Intraclass correlation coefficients (ICCs) and coefficients of variation (CVs) demonstrated high within-session reliability for bilateral and unilateral IMTP PF (ICC = .94, CV = 4.7-5.5%). Lower reliability measures and greater variability were observed for bilateral and unilateral IMTP impulse at time bands (ICC = .81-.88, CV = 7.7-11.8%). Paired-sample t tests and Cohen d effect sizes revealed no significant differences for all isometric force-time characteristics between right and left limbs in male college athletes (P > .05, d <= 0.32) and professional rugby league players (P > .05, d <= 0.11); however, significant differences were found between D and ND limbs in male college athletes (P < .001, d = 0.43-0.91) and professional rugby league players (P < .001, d = 0.27-0.46). Conclusion: This study demonstrated high within-session reliability for unilateral-stance IMTP PF, revealing significant differences in isometric force-time characteristics between D and ND limbs in male athletes.

• 出版日期2017-4