The present study was conducted to determine the effects of acute overload exercise on mitochondrial DNA and the structure of skeletal muscles. Rats were forced to run for 20 min until reaching complete exhaustion. We detected the large‐scale deletion (7052 bp) of mitochondrial DNA by the nested polymerase chain reaction, and also observed mitochondrial ultrastructural changes in the soleus muscle. © 1999 John Wiley & Sons, Inc. Muscle Nerve 22: 258–261, 1999

The objective of this study was to quantitatively analyze differences in diaphragmatic motion between supine and prone positioning during resting breathing using dynamic Magnetic Resonance Imaging. Total diaphragmatic motion (TDM), defined as total excursion of the anterior (ANT), central (CNT), and posterior (PST) diaphragm, was 61 mm in the supine position and 63 mm in the prone position. No significant difference in TDM was apparent in response to change in positioning. Diaphragmatic motion was greatest in the PST > CNT > ANT with supine positioning, and PST > ANT ≈ CNT with prone positioning. In both positions, motion tended to be greatest in the posterior diaphragm. However, relative changes in CNT and PST were less with prone than with supine positioning. These findings suggest that ventilation in the posterior lung fields is decreased to a greater extent with prone than with supine positioning.

The purpose of this study was to quantitatively analyze differences in normal diaphragmatic motions during spontaneous breathing (SB) and maximal deep breathing (MDB) using dynamic analysis of magnetic resonance imaging (dynamic MRI), to examine whether there is correlation between total diaphragmatic motion during MDB and BMI, vital capacity (VC), and chest expansion. Mean cephalocaudal distance in diaphragmatic motion was 14 mm in the ventral region, 20 mm in the central region, 27 mm in the dorsal region during SB, and 41 mm in the ventral region, 64-67 mm in the central region, and 74 mm in the dorsal region during MDB. No correlation was apparent between total diaphragmatic motion during MDB and BMI, VC, or chest expansion.

No abstract

No abstract