In:
Clinical Journal of Sport Medicine, Ovid Technologies (Wolters Kluwer Health), Vol. 29, No. 1 ( 2019-01), p. 69-77
Abstract:
To determine intrasession and intersession reliability of strength measurements and hamstrings to quadriceps strength imbalance ratios (H/Q ratios) using the new isoforce dynamometer. Design: Repeated measures. Setting: Exercise science laboratory. Participants: Thirty healthy subjects (15 females, 15 males, 27.8 years). Main Outcome Measures: Coefficient of variation (CV) and intraclass correlation coefficients (ICC) were calculated for (1) strength parameters, that is peak torque, mean work, and mean power for concentric and eccentric maximal voluntary contractions; isometric maximal voluntary torque (IMVT); rate of torque development (RTD), and (2) H/Q ratios, that is conventional concentric, eccentric, and isometric H/Q ratios (H con /Q con at 60 deg/s, 120 deg/s, and 180 deg/s, H ecc /Q ecc at −60 deg/s and H iso /Q iso ) and functional eccentric antagonist to concentric agonist H/Q ratios (H ecc /Q con and H con /Q ecc ). High reliability: CV 〈 10%, ICC 〉 0.90; moderate reliability: CV between 10% and 20%, ICC between 0.80 and 0.90; low reliability: CV 〉 20%, ICC 〈 0.80. Results: (1) Strength parameters: (a) high intrasession reliability for concentric, eccentric, and isometric measurements, (b) moderate-to-high intersession reliability for concentric and eccentric measurements and IMVT, and (c) moderate-to-high intrasession reliability but low intersession reliability for RTD. (2) H/Q ratios: (a) moderate-to-high intrasession reliability for conventional ratios, (b) high intrasession reliability for functional ratios, (c) higher intersession reliability for H con /Q con and H iso /Q iso (moderate to high) than H ecc /Q ecc (low to moderate), and (d) higher intersession reliability for conventional H/Q ratios (low to high) than functional H/Q ratios (low to moderate). Conclusions: The results have confirmed the reliability of strength parameters and the most frequently used H/Q ratios.
Type of Medium:
Online Resource
ISSN:
1050-642X
DOI:
10.1097/JSM.0000000000000493
Language:
English
Publisher:
Ovid Technologies (Wolters Kluwer Health)
Publication Date:
2019
detail.hit.zdb_id:
2045233-0
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