Seibold, B. Tanner; Hutchison, Cortland; Preece, J. Caleb; Feland, J. Brent (Brigham Young University)
Faculty Advisor: Feland, J. Brent (Life Sciences, Exercise Science)
BACKGROUND: To date, a few studies have demonstrated shear wave elastography (SWE) values for the gastrocnemius muscles in younger subjects (<30 yrs). However, little info is available on aging muscle. SWE of aging muscle is needed to better understand the intrinsic tensile changes that take place in muscle over time.
PURPOSE: This study aimed to determine how cross-sectional area (CSA) and SWE correlate with each other) in both the medial and lateral gastrocnemius muscles of active older athletes participating in the HuntsmanWorld Senior Games.
METHODS: Data was collected from 116 volunteers (participants in the Huntsman World Senior Games) in St. George, Utah, 2019. Subjects (62 males: mean age = 68.9 ± 7.8 yrs, Ht = 177.4 ± 8.1 cm, Wt = 85.4 ± 20 kg; 54 females: mean age = 66.9 ± 8.5 yrs, Ht = 164.4 ± 7.2 cm, Wt = 69.8 ± 18 kg) signed an approved consent form and then lay prone on a treatment table for ultrasonic measurement of both CSA and SWE of both heads of the gastrocnemius.
ANALYSIS: All data were analyzed using SPSS ver25 with a multivariate analysis utilizing both age, height, and weight as covariates with Pearson correlations calculated on the relationship between CSA and SWE of both heads.
RESULTS & CONCLUSION: We hypothesized that increases in cross-sectional area would positively correlate with increased SWE values since the muscle would be larger and prior studies have found muscle hypertrophy increases muscle pennation angle. Neither Medial gastroc (r=-.100, p=.280) or Lateral gastroc (r=.047, p=.613) CSA was significantly correlated with their respective SWE ratings. Age significantly affected CSA only after the age of 59, but similarities in CSA and SWE between all participants may be the result of the high level of activity of these subjects.