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Open AccessArticle

Comparison of the Relationship between Lying and Standing Ultrasonography Measures of Muscle Morphology with Isometric and Dynamic Force Production Capabilities

1
Center of Excellence for Sport Science and Coach Education, Department of Sport, Exercise, Recreation, and Kinesiology, East Tennessee State University, Johnson City, TN 37601, USA
2
Department of Physical Therapy and Human Movement Science, Sacred Heart University, Fairfield, CT 06825, USA
3
Department of Internal Medicine, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37601, USA
*
Author to whom correspondence should be addressed.
Sports 2017, 5(4), 88; https://doi.org/10.3390/sports5040088
Received: 24 October 2017 / Revised: 10 November 2017 / Accepted: 14 November 2017 / Published: 21 November 2017
The purpose of the current study was (1) to examine the differences between standing and lying measures of vastus lateralis (VL), muscle thickness (MT), pennation angle (PA), and cross-sectional area (CSA) using ultrasonography; and (2) to explore the relationships between lying and standing measures with isometric and dynamic assessments of force production—specifically peak force, rate of force development (RFD), impulse, and one-repetition maximum back squat. Fourteen resistance-trained subjects (age = 26.8 ± 4.0 years, height = 181.4 ± 6.0 cm, body mass = 89.8 ± 10.7 kg, back squat to body mass ratio = 1.84 ± 0.34) agreed to participate. Lying and standing ultrasonography images of the right VL were collected following 48 hours of rest. Isometric squat assessments followed ultrasonography, and were performed on force platforms with data used to determine isometric peak force (IPF), as well as RFD and impulse at various time points. Forty-eight hours later, one-repetition maximum back squats were performed by each subject. Paired-samples t-tests revealed statistically significant differences between standing and lying measurements of MT (p < 0.001), PA (p < 0.001), and CSA (p ≤ 0.05), with standing values larger in all cases. Further, standing measures were correlated more strongly and abundantly to isometric and dynamic performance. These results suggest that if practitioners intend to gain insight into strength-power potential based on ultrasonography measurements, performing the measurement collection with the athlete in a standing posture may be preferred. View Full-Text
Keywords: ultrasonography; muscle architecture; force; strength; rate of force development ultrasonography; muscle architecture; force; strength; rate of force development
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Wagle, J.P.; Carroll, K.M.; Cunanan, A.J.; Taber, C.B.; Wetmore, A.; Bingham, G.E.; DeWeese, B.H.; Sato, K.; Stuart, C.A.; Stone, M.H. Comparison of the Relationship between Lying and Standing Ultrasonography Measures of Muscle Morphology with Isometric and Dynamic Force Production Capabilities. Sports 2017, 5, 88.

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