Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers

Fleckenstein, James L.; Canby, Robert C.; Parkey, Robert W.; Peshock, Ronald M

doi:10.2214/ajr.151.2.231

Cited by 279 publications

(246 citation statements)

References 5 publications

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“…with exertion; these resolve within minutes (14). Eccentric contractions generate force concentrations that are significantly greater than with concentric contractions (9,15).…”

Section: Teaching Pointsmentioning

confidence: 99%

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance

et al. 2018

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“…with exertion; these resolve within minutes (14). Eccentric contractions generate force concentrations that are significantly greater than with concentric contractions (9,15).…”

Section: Teaching Pointsmentioning

confidence: 99%

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance

et al. 2018

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“…Defining V ij ϭ ͑U Ϫ1 ͒ ij [16] where U is the matrix whose columns are the eigenvectors determined from Eq. [3].…”

Section: Appendix Bmentioning

confidence: 99%

“…Extensive research in the field of muscle activity measurements by MRI underscore the important role of muscle MR in neurophysiologic research, diagnosis, and therapy (15)(16)(17)(18)(19). Muscle MRE (11,20 -24) is developing into a straightforward technique for detecting several diseases that affect muscle elasticity, such as hypogonadism (25) and obstructive pulmonary disease (26).…”

mentioning

confidence: 99%

Shear wave group velocity inversion in MR elastography of human skeletal muscle

Papazoglou

Rump

Braun

et al. 2006

Magnetic Resonance in Med

107

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In vivo quantification of the anisotropic shear elasticity of soft tissue is an appealing objective of elastography techniques because elastic anisotropy can potentially provide specific information about structural alterations in diseased tissue. Here a method is introduced and applied to MR elastography (MRE) of skeletal muscle. With this method one can elucidate anisotropy by means of two shear moduli (one parallel and one perpendicular to the muscle fiber direction). The technique is based on group velocity inversion applied to bulk shear waves, which is achieved by an automatic analysis of wave-phase gradients on a spatiotemporal scale. The shear moduli are then accessed by analyzing the directional dependence of the shear wave speed using analytic expressions of group velocities in k-space, which are numerically mapped to real space. The method is demonstrated by MRE experiments on the biceps muscle of five volunteers, resulting in 5.5 ؎ 0.9 kPa and 29.3 ؎ 6.2 kPa (P < 0.05) for the medians of the perpendicular and parallel shear moduli, respectively. The proposed technique combines fast steadystate free precession (SSFP) MRE experiments and fully automated processing of anisotropic wave data, and is thus an interesting MRI modality for aiding clinical diagnosis. Magn Reson Med 56:489 -497, 2006.

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“…The acquisition of MR 'localizer' images before MRS examination, in order to evaluate the anatomy, is straightforward and mandatory for an appropriate determination of intramyocellular lipids (IMCL) levels. Activation of specific muscle groups can be visualized by MR images using specific acquisition indices (Fleckenstein et al 1988(Fleckenstein et al , 1989. This procedure can be used to evaluate the involvement of muscles during exercise in ergometers in the MR magnet.…”

Section: Magnetic Resonance Imaging: Magnetic Resonance Spectroscopy:mentioning

confidence: 99%

Observation of intramyocellular lipids by means of¹H magnetic resonance spectroscopy

et al. 1999

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fax +41 31 382 24 86, email chris.boesch@insel.ch Magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MRS) are being increasingly used for investigations of human muscle physiology. While MRI reveals the morphology of muscles in great detail (e.g. for the determination of muscle volumes), MRS provides information on the chemical composition of the tissue. Depending on the observed nucleus, MRS allows the monitoring of high-energy phosphates ( 31 P MRS), glycogen ( 13 C MRS), or intramyocellular lipids ( 1 H MRS), to give only a few examples. The observation of intramyocellular lipids (IMCL) by means of 1 H MRS is non-invasive and, therefore, can be repeated many times and with a high temporal resolution. MRS has the potential to replace the biopsy for the monitoring of IMCL levels; however, the biopsy still has the advantage that other methods such as those used in molecular biology can be applied to the sample. The present study describes variations in the IMCL levels (expressed in mmol/kg wet weight and ml/100 ml) in three different muscles before and after (0, 1, 2, and 5 d) marathon runs for a well-trained individual who followed two different recovery protocols varying mainly in the diet. It was shown that the repletion of IMCL levels is strongly dependent on the diet post exercise. The monitoring of IMCL levels by means of 1 H MRS is extremely promising, but several methodological limitations and pitfalls need to be considered, and these are addressed in the present review.

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Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers

Cited by 279 publications

References 5 publications

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance

Shear wave group velocity inversion in MR elastography of human skeletal muscle

Observation of intramyocellular lipids by means of¹H magnetic resonance spectroscopy

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Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers

Cited by 279 publications

References 5 publications

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance

MR Imaging of Muscle Trauma: Anatomy, Biomechanics, Pathophysiology, and Imaging Appearance

Shear wave group velocity inversion in MR elastography of human skeletal muscle

Observation of intramyocellular lipids by means of1H magnetic resonance spectroscopy

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Observation of intramyocellular lipids by means of¹H magnetic resonance spectroscopy