Abstract
Intramuscular pressure (IMP) shows promise for estimating individual muscle tension in vivo. However, previous pressure measurements show high variability during isometric contraction and poor correlation with tension during dynamic contraction. We hypothesized that enhanced sensor anchoring/orientation would improve tension estimation and thus developed a novel pressure sensor with a barbed housing. Sensors were inserted into the tibialis anterior (TA) of New Zealand White rabbits (N = 8) both parallel and perpendicular to the fiber orientation. We measured muscle stress and IMP during both isometric and dynamic contractions. Passive stress showed good agreement for both insertion directions across muscle lengths (ICC > 0.8). Active stress and IMP agreement were good (ICC = 0.87 ± 0.04) for perpendicular insertions but poor (ICC = 0.21 ± 0.22) for parallel insertions across both dynamic contractions and isometric contractions within the muscle’s range of motion. These findings support use of IMP measurements to estimate muscle tension across a range of contraction conditions.
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Abbreviations
- IMP:
-
Intramuscular pressure
- COV:
-
Coefficient of variation
- TA:
-
Tibialis anterior
- ROM:
-
Range of motion
- HA:
-
Hyaluronic acid
- PCSA:
-
Physiological cross-sectional area
- COD:
-
Coefficient of determination
- ICC:
-
Intraclass correlation coefficient
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Acknowledgments
We are grateful to Shannon Bremner and Mary Esparza for their technical assistance and Dr. Koichi Masuda for valuable experimental advice. We thank Elisabeth Jensen, Shanette Go, Loribeth Evertz, and FISO Corporation for their contribution to the design, development, and manufacturing of the pressure microsensor. This study was supported by National Institute of Health Grants P30AR061303, R24HD050837, R01HD031476, and the Department of Veterans Affairs grant numbers I01RX002462 and IK6 RX003351.
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O’Connor, S.M., Kaufman, K.R., Ward, S.R. et al. Sensor Anchoring Improves the Correlation Between Intramuscular Pressure and Muscle Tension in a Rabbit Model. Ann Biomed Eng 49, 912–921 (2021). https://doi.org/10.1007/s10439-020-02633-7
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DOI: https://doi.org/10.1007/s10439-020-02633-7