Evaluation of exercised or cooled skeletal muscle on the basis of diffusion-weighted magnetic resonance imaging
| Autor: | Osamu Yanagisawa, Matthew L. Nielsen, Daisuke Shimao, Katsuya Maruyama |
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| Rok vydání: | 2008 |
| Předmět: |
Adult
Male Materials science Physiology Microcirculation Nuclear magnetic resonance Physiology (medical) medicine Image Processing Computer-Assisted Effective diffusion coefficient Humans Orthopedics and Sports Medicine Diffusion (business) Exercise physiology Muscle Skeletal Exercise medicine.diagnostic_test Public Health Environmental and Occupational Health Magnetic resonance imaging General Medicine Cold Temperature medicine.anatomical_structure Diffusion Magnetic Resonance Imaging Muscle Fatigue Female Ankle Perfusion Ankle Joint Diffusion MRI Muscle Contraction |
| Zdroj: | European journal of applied physiology. 105(5) |
| ISSN: | 1439-6327 |
| Popis: | In this study, we assessed the physiological changes after exercising or cooling skeletal muscles on the basis of the apparent diffusion coefficient (ADC) values in magnetic resonance (MR) diffusion-weighted images (DWIs). DWIs of the ankle dorsiflexors were acquired with a 1.5-T MR device before and after exercising (22 subjects) or cooling (19 subjects). The exercise comprised a 5-min walk with the ankles dorsiflexed and a 30-time ankle dorsiflexion. Cooling (0 degrees C) of the ankle dorsiflexors was performed for 30 min. ADC values were calculated as ADC1-reflecting diffusion and perfusion and ADC2-approximating the true diffusion coefficient of the ankle dorsiflexors before and after exercising or cooling. ADC1 and ADC2 significantly increased with exercise and decreased with cooling (P0.05). Considering both diffusion and perfusion, ADC values allowed us to evaluate the intramuscular changes induced by exercising or cooling in terms of the motion of water molecules and microcirculation. |
| Databáze: | OpenAIRE |
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