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- Title
MR elastography measurement of the effect of passive warmup prior to eccentric exercise on thigh muscle mechanical properties.
- Authors
Kennedy, Paul; Macgregor, Lewis J.; Barnhill, Eric; Johnson, Curtis L.; Perrins, Michael; Hunter, Angus; Brown, Colin; Beek, Edwin J.R.; Roberts, Neil; van Beek, Edwin J R
- Abstract
<bold>Purpose: </bold>To investigate the effect of warmup by application of the thermal agent Deep Heat (DH) on muscle mechanical properties using magnetic resonance elastography (MRE) at 3T before and after exercise-induced muscle damage (EIMD).<bold>Materials and Methods: </bold>Twenty male participants performed an individualized protocol designed to induce EIMD in the quadriceps. DH was applied to the thigh in 50% of the participants before exercise. MRE, T2 -weighted MRI, maximal voluntary contraction (MVC), creatine kinase (CK) concentration, and muscle soreness were measured before and after the protocol to assess EIMD effects. Five participants were excluded: four having not experienced EIMD and one due to incidental findings.<bold>Results: </bold>Total workload performed during the EIMD protocol was greater in the DH group than the control group (P < 0.03), despite no significant differences in baseline MVC (P = 0.23). Shear stiffness |G*| increased in the rectus femoris (RF) muscle in both groups (P < 0.03); however, DH was not a significant between-group factor (P = 0.15). MVC values returned to baseline faster in the DH group (5 days) than the control group (7 days). Participants who displayed hyperintensity on T2 -weighted images had a greater stiffness increase following damage than those without: RF; 0.61 kPa vs. 0.15 kPa, P < 0.006, vastus intermedius; 0.34 kPa vs. 0.03 kPa, P = 0.06.<bold>Conclusion: </bold>EIMD produces increased muscle stiffness as measured by MRE, with the change in |G*| significantly increased when T2 hyperintensity was present. DH did not affect CK concentration or soreness; however, DH participants produced greater workload during the EIMD protocol and exhibited accelerated MVC recovery.<bold>Level Of Evidence: </bold>1 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2017;46:1115-1127.
- Publication
Journal of Magnetic Resonance Imaging, 2017, Vol 46, Issue 4, p1115
- ISSN
1053-1807
- Publication type
journal article
- DOI
10.1002/jmri.25642