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

Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers. Research Abstract Details 

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Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers. Abstract Text:

J L Fleckenstein,R C Canby,R W Parkey,R M Peshock,

Exercise is known to produce changes in the amount and distribution of water in skeletal muscle. Because MR imaging is highly sensitive to changes in water distribution, these changes should be detectable under appropriate imaging conditions. Imaging of the forearms and/or legs was performed in 16 volunteers at 0.35 T, before and after exercise. Exercises included finger flexion and extension, wrist flexion, ankle plantar flexion, and great toe extension. In the case of handgrip exercise, the level of exertion was quantitated. Individual muscles were frequently indistinguishable on preexercise scans. After exercise, active and inactive muscles could be clearly distinguished. For example, in the flexor digitorum profundus, finger flexion resulted in an increase in the image-derived estimate of T1 (T1 postexercise was 1037 +/- 162 msec vs T1 preexercise of 590 +/- 49 msec, p less than .001). T2 also increased (T2 postexercise was 35 +/- 2 msec vs T2 preexercise of 28 +/- 1 msec, p less than .001). Relative spin density also increased (p less than .001). T1, T2, and spin density subsequently decreased with time but were still increased above baseline at 10 min postexercise (p less than .005). Signal changes correlated moderately with the level of exertion (r = .63) and fatigue (r = .45). Vascular occlusion did not prevent intensity changes. Thus, changes in skeletal muscle MR signal intensity occur with exercise and appear to parallel known alterations in water distribution.

Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers. Publishing Authors By Initials

JL Fleckenstein,RC Canby,RW Parkey,RM Peshock,

For similar musculoskeletal system: muscles research abstracts see: musculoskeletal system: muscles research

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Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: AJR. American journal of roentgenology

VOLUME: 151

Page Numbers: 231-7

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ISSN: 0361-803X

DAY: 15

MONTH: Aug

YEAR: 1988

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

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LANGUAGE: eng

NlmUniqueID: 7708173

Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers. Keywords Mesh Terms:

KEYWORDS: Muscles

MESH TERMS: physiology

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Grant and Affiliation Information for Acute effects of exercise on MR imaging of skeletal muscle in normal volunteers.

AFFILIATION: Department of Radiology, University of Texas Southwestern Medical Center, Dallas 75235.

Country: UNITED STATES

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MEDLINETA: AJR Am J Roentgenol

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