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L Doerr

Publications and source records attributed to L Doerr.

5 recordsLinked to original sources
PubMed1992

[Comparative speech audiometry studies with compact disk].

We compared the results of speech audiometry, performed with recorded tape and CD, respectively, in 21 subjects with bone conduction hearing loss, and in 27 subjects with sensorineural hearing loss. In all cases, speech audiometry was performed by using the German Freiburg speech test material, recorded in 1969 on the basis of the German DIN standard 45626. In subjects with an air-bone gap, the hearing loss for speech is 2.3 dB smaller if tested by use of CD, and the speech recognition is 10.5 points better, respectively. Smaller differences could be found in sensorineural HL: For CD, the hearing loss is 1.2 dB smaller, and the speech recognition score is raised by only 1 point. These differences are statistically not significant, and the calculation of hearing impairment and individual hearing handicap from the tables commonly used in Germany in medicolegal expert opinions must not be corrected, if records on CD are used basing on the recordings from 1969 according to DIN 45626. The handling of compact discs has many advantages in relation to the handling of tapes.

Adult↗
PubMed1976

Exercise effect on contractile properties of skeletal muscle in mouse muscular dystrophy.

The purpose of this study was to determine the effect of a high repetitive exercise program, treadmill running, on the tetanic tension and rate of tension development of the slow twitch soleus muscle of normal plus dystrophic mice and their littermates. The exercise program used would be considered to be of mild intensity since it failed to produce any detectable histochemical or biochemical changes. In the noninvolved normal and littermate mice, there was no difference in maximum tetanic tension between the exercised and nonexercised control groups. In the normal mice (eight weeks of age), there was a significant decrease in rate of tension development for those exercised for five weeks compared to nonexercised controls. In littermate mice (seven weeks old) exercised for a four-week period, there was also a significantly lower rate of tension development compared to their nonexercised controls. In dystrophic mice (seven weeks old) exercised for only one to two weeks, there was significantly lower tension as well as rate of tension developed for the exercised mice when compared to nonexercised dystrophic mice. In dystrophic mice (six weeks old) exercised for one to two weeks, there was no difference in tension or rate of tension development when compared to nonexercised controls. In both six and seven-week-old littermate mice, also exercised for one to two weeks, this reduction in tension and rate of tension development did not occur. The average life span for the dystrophic mice used in this study is about 30 weeks. Of the nine exercised dystrophic mice scheduled for study at eight weeks, only one survived, suggesting that even the mild exercise used might have shortened their life expectancy.

Animals↗