Date of this Version
Garrett, J. 2020. Vastus Lateralis Echo Intensity Correlates with Muscular Strength and Endurance in Young Men and Women. Undergraduate Honors Thesis. University of Nebraska-Lincoln.
Echo intensity (EI) serves as a practical and noninvasive technique for quantifying muscle quality, acute swelling, muscle damage, and intramuscular glycogen. Resistance exercise research studies are increasingly utilizing EI to assess muscle size and performance variables such as muscular strength and endurance. Purpose: The purpose of this study was to evaluate the relationships between EI and muscular strength (maximal voluntary isometric contraction [MVIC]) and endurance (time-to-exhaustion [TTE]) in young men and women. B-mode ultrasonography was used to examine the vastus lateralis of 15 young men and 15 young women. Methods: Participants (men: n=15, age = 21.1 ± 1.8 y; women: n=15: age = 19.5 ± 0.8 y) completed a MVIC to assess muscular strength and a sustained, isometric leg extension muscle action at 45% MVIC to assess muscular endurance. The EI was assessed from the vastus lateralis. Results: There was a significant (r = -0.354, p = 0.028) correlation between EI and normalized MVIC force for the combined sample (n=30). There was also a significant correlation (r =-0.520, p = 0.002) between EI and absolute MVIC force for the combined sample. Additionally, the correlation between EI and TTE was significant for men (r = -0.449, p = 0.047) and the combined sample (r = -0.477, p = 0.004), but not the women (p>0.05). Although these findings suggest that EI is related to muscular strength and endurance in both sexes, further research is needed.