PMID: 8583871Jan 1, 1995Paper

Dynamic echo planar imaging of exercised muscle

Magnetic Resonance Imaging
R P KennanJohn C Gore

Abstract

Echo planar imaging was used to record dynamic changes in tissue transverse relaxation rates (delta R2) in the anterior tibialis muscle during dorsi-flexion exercise and recovery. Using a single spin-echo technique to calculate the change in relaxation rate produced by the exercise a time resolution of 4 s was achieved for each measurement of delta R2. For a fixed workload of 70% of maximum voluntary contraction (MVC), the duration of dorsi-flexion exercise was varied and measurements of delta R2 were obtained throughout exercise and for at lease 5 min of recovery. Comparisons were made between the single echo results and those obtained using multiple echo measurements of T2 with much lower time resolution, to verify that the two techniques gave the same results. We found on average that delta R2 decreased by an average of 8.7 s-1 within the tibialis with an average rate of decrease during exercise of delta R2/ delta t(ex) = -0.061 s-2. For the high time resolution studies we consistently observed that there was a continued decrease in the measured value of delta R2 after the exercise, reaching a minimum value about a minute after the exercise ceased. This average rate of undershoot during the postexercise period was given by d...Continue Reading

References

Nov 1, 1992·Journal of Magnetic Resonance Imaging : JMRI·D MorvanH Nahum
Jul 1, 1992·Journal of Magnetic Resonance Imaging : JMRI·B T ArcherR M Peshock
Oct 1, 1990·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·R V MulkernF A Jolesz
Aug 1, 1988·AJR. American Journal of Roentgenology·J L FleckensteinR M Peshock
Jan 1, 1987·Magnetic Resonance Imaging·E Le RumeurP Rochcongar
Jun 1, 1986·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·S MajumdarJ C Gore
Jun 1, 1972·Acta Physiologica Scandinavica·J LundvallT White

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Citations

May 17, 2000·Journal of Magnetic Resonance Imaging : JMRI·S K WarfieldR Kikinis
Mar 21, 1998·Magnetic Resonance Imaging·J M BonnyJ P Renou
Sep 19, 1998·Medicine and Science in Sports and Exercise·T B PriceJ C Gore
Jul 2, 2011·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Noriyuki TawaraAkiyoshi Itoh
Mar 4, 2008·Nihon Hoshasen Gijutsu Gakkai zasshi·Noriyuki TawaraAkiyoshi Itoh
Aug 21, 2013·Journal of Magnetic Resonance Imaging : JMRI·Rajpaul Attariwala, Wayne Picker
Feb 13, 2001·Journal of Applied Physiology·B M PriorR A Meyer
May 9, 1998·Journal of Applied Physiology·T B Price, J C Gore
May 27, 2003·Journal of Applied Physiology·Bruce M DamonJane A Kent-Braun
Aug 31, 2004·Journal of Applied Physiology·Bruce M Damon, John C Gore

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