Echo intensity is weakly associated with muscular strength and endurance in young, healthy adults

Garrett J., Keller J., Anders J. P. , Hergenrader K., Neltner T., Housh T., ...More

RESEARCH IN SPORTS MEDICINE, vol.30, no.4, pp.371-382, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 4
  • Publication Date: 2022
  • Doi Number: 10.1080/15438627.2021.1888109
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, IBZ Online, CAB Abstracts, CINAHL, EMBASE, MEDLINE, SportDiscus
  • Page Numbers: pp.371-382
  • Keywords: Muscle quality, time to task failure, sex differences, maximal Voluntary Contraction, ultrasonography
  • Gazi University Affiliated: No


The purpose of this study was to evaluate the relationships between echo intensity (EI) and muscular strength (maximal voluntary isometric contraction [MVIC]) and endurance (time-to task-failure [TTF]) in young adults. Ultrasonography was used to examine the dominant vastus lateralis of 15 young men and 15 young women. The participants completed an MVIC to assess muscular strength and sustained a bilateral, leg extension at 45% MVIC to assess muscular endurance. 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 (r = -0.520, p = 0.002) correlation between EI and absolute MVIC force for the combined sample. The correlation between EI and TTE was significant for the men (r = -0.449, p = 0.047) and the combined sample (r = -0.477, p = 0.004). Overall, muscle quality as assessed by EI does not appear to be strongly related to muscular strength, but there may be a modest correlation with muscular endurance.