This study examined the erector spinae contractile properties, trunk isokinetic strength, and differences in acute muscle fatigue response after exercise in young females with and without non-specific chronic low back pain (NSCLBP). This study evaluated participants using tensiomyography and isokinetic trunk strength tests. An independent t-test compared the control group and the NSCLBP group, while a two-way mixed ANOVA analyzed differences in the erector spinae’s acute muscle fatigue response before and after exercise within and between groups. The results of the tensiomyography indicated that the NSCLBP group exhibited significantly lower Dm and Vc (p < 0.05) compared to the control group, while Tc showed no significant difference between groups. Significant differences in all variables were observed between the groups in the isokinetic trunk strength test (p < 0.05). Furthermore, the two-way mixed ANOVA revealed significant group main effects in Dm and Vc of the erector spinae (p < 0.05). This study found that non-specific chronic low back pain is linked to a decrease in Dm, Vc, and trunk isokinetic strength in both extensor and flexor muscles. It suggests that future research should further investigate the acute muscle fatigue response in individuals with and without NSCLBP.

Purpose: The purpose of this study was to examine the effects of a combined core stabilization exercise program on the static contractile properties of the erector spinae and the isokinetic muscle function of trunk flexion and extension in office workers aged twenty years and older. Methods: All participants performed a combined core stabilization exercise program, for seven weeks. And all participants were assessed using tensiomyography to evaluate the contractile properties of the erector spinae, and also assessed for isokinetic trunk strength. Results: As a result of tensiomyography, we found that significant main effect of sex on contraction time (p ≤ 0.001), and maximum radial displacement, velocity of contraction demonstrated significant main effects for sex and time (p ≤ 0.001). Regarding isokinetic trunk muscle function, significant main effects of sex and time were observed for trunk flexion, extension, and the flexion/extension ratio at 60 °/sec (p ≤ 0.001) and 90 °/sec (p ≤ 0.001). In addition, trunk extension at 90 °/sec demonstrated a significant sex-by-time interaction (p = 0.010). Conclusions: These findings suggest that overall, the 7-week combined core stabilization exercise program was effective in enhancing the static contractile properties of the erector spinae and improving trunk isokinetic muscle function.

Purpose: The purpose of this study was to compare pain levels, functional impairment, contractile properties of the erector spinae, and spinal kinematics in females with and without non-specific chronic low back pain (NSCLBP) and to examine the interrelationships among these variables. Methods: All participants were assessed for pain levels and functional impairment. Tensiomyography was used to evaluate the contractile properties of the erector spinae, and all participants were assessed for spinal kinematics during a lift task. An Independent t-test was performed to compare all variables between the control group and the NSCLBP group, and the Pearson correlation coefficient analysis was performed to examine the relationships among all variables. Results: We found significant differences between groups in pain levels, functional impairment, maximal radial muscle displacement, contraction velocity, and lumbar extension and rotation angles. Additionally, Pearson correlation analysis revealed a significant positive correlation between pain levels, functional impairment, and the lumbar extension angle, and a significant negative correlation was found between maximal radial muscle displacement and both pain levels and functional impairment. Conclusions: This study identified differences in pain level, functional impairment, contractile properties of erector spinae, and spinal kinematics based on NSCLBP presence, along with correlations among these variables. Further research should explore other functional motor tasks.

Study Objective: This study aimed to examine the effects of a short-term (three times a week for a total of four weeks) low-load elastic exercise program on sarcopenia-related parameters and the contractile properties of the vastus lateralis in twenty older adult women. Methods: All participants underwent assessments for sarcopenia-related parameters, including body composition, strength, and functional performance. Tensiomyography was utilized to evaluate the contractile properties of the vastus lateralis. A paired samples t-test was employed to compare pre-and post-exercise intervention measurements. Results: Except for body weight, all parameters associated with sarcopenia showed a significant difference following low-load elastic exercise program (p < 0.05). Tensiomyography of the vastus lateralis indicated a considerable increase in contraction time after low-load elastic exercise program (p < 0.05); however, there were no significant differences in maximum radial displacement or velocity of contraction. Conclusions: Our findings suggest that a short-term low-load elastic exercise program may be associated with improvements in sarcopenia–related indicators, including muscle strength and muscle contraction characteristics, in older adults, while being time-efficient.

Objective: The purpose of this study was to compare the contractile properties of posterior chain muscles and isokinetic trunk strength in females with or without non-specific chronic low back pain (NSCLBP). Method: All participants (control group: n = 22, NSCLBP group: n = 22) were assessed using tensiomyography to evaluate the contractile properties of the posterior chain muscles, and all participants were also assessed for isokinetic trunk strength. An independent t-test was performed to compare the tensiomyography variables and isokinetic trunk strength test results between group. Results: Result of tensiomyography, we found that the contraction time significant differences in the maximal radial muscle displacement, and velocity of contraction between groups in erector spinae. Semitendinosus revealed significant differences in all variables between groups. Additionally, the isokinetic trunk strength test revealed significant differences in all variables between groups. Conclusion: These findings suggest that due to the characteristics of NSCLBP, such as increased muscle stiffness, fat infiltration, and muscle fatigue, kinesiophobia, physical deconditioning syndrome, the posterior chain muscles of the NSCLBP group showed higher muscle stiffness and slower contraction speed than the control group. Also in the NSCLBP group, trunk isokinetic muscle strength was lower than in the control group, and flexor and extensor muscles were unbalanced.