期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 19, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/ijerph191912673
关键词
isokinetic; core muscles; antagonist; agonist; muscle strength; dynamometer
资金
- DGI-University Andres Bello [DI-08-CBC/22]
- FEDER/Ministry of Science, Innovation, and Universities-State Research Agency [RTI2018-099723-B-I00]
This study analyzed the trunk strength ratio normalized by body weight and muscle mass and compared the conventional and functional ratios collected in different conditions. The results showed that trunk extensors were stronger than flexors and had higher muscle quality at high velocities. The functional ratios behaved differently at different velocities, highlighting the need for further research in different populations.
Background: The trunk strength conventional ratio (CR) has been evaluated. However, the functional ratio and the ratio of strength to body weight (BW) or muscle mass (MM) have been poorly explored. Relative strength is a measure of muscle quality. Objectives: To analyze the trunk strength ratio normalized by BW and MM and compare the trunk's conventional and functional ratios collected in isokinetic and isometric conditions. Methods: Twenty-seven healthy males (21.48 +/- 2.08 years, 70.22 +/- 7.65 kg) were evaluated for trunk isometric and isokinetic strength using a functional electromechanical dynamometer. Results: The extensor's strength was greater than the flexors, with a CR of 0.41 +/- 0.10 to 0.44 +/- 0.10. Muscle quality was higher in eccentric contraction and high velocity for flexors and extensors. The functional flexor ratio (FFR) ranged between 0.41 +/- 0.09 and 0.92 +/- 0.27. The functional extensor ratio (FER) ranged between 2.53 +/- 0.65 and 4.92 +/- 1.26. The FFR and FER showed significant differences between velocities when considering the peak strength (p = 0.001) and mean strength (p = 0.001). Conclusions: Trunk extensors were stronger than the flexors; thus, the CR was less than one. Muscle quality was higher at a high velocity. Unlike CR, FFR and FER behaved differently at distinct velocities. This finding highlights the need to explore the behavior of the functional ratio in different populations.
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