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Biomedical subjects

F Lindgren

Publications and source records attributed to F Lindgren.

48 records · Page 3Linked to original sources
PubMed1978

Temporary threshold shift after exposure to pop music.

Temporary threshold shift (TTS) was studied in pop musicians as well as in listeners. It appears that TTS is less pronounced in pop musicians than in listeners. This can only in part be explained by slightly inferior hearing threshold levels than in the audience before exposure. Further, male listeners showed more TTS than female listeners. After 2 hours of exposure to live pop music a TTS2 appears in pop musicians after an exposure to 98 dB(A) as opposed to listeners where TTS2 appears at 92 dB(A). When the present results are related to the CHABA risk criteria it seems that exposure to live pop music at 100 dB(A) for 2 hours is a limit which should not be exceeded if the risk of permanent hearing loss is to be avoided.

Acoustics↗
PubMed1977

Factors increasing the risk for hearing loss in 'pop' musicians.

Hearing thresholds were determined in 83 'pop' musicians with an average age of 26 years, average exposure time of 9 years and average weekly exposure time of 18 hours. The following factors had a statistically significant influence (p 95) on hearing: ageing, brief exposure per session, long exposure time in years (2 kHz), participation in military service (250 Hz), listening to pop music with head phones (2 kHz).

Adult↗
PubMedDate not supplied

Pop music and hearing.

Several factors indicate the possibility of sensorineural hearing loss in connection with pop music. However, very few investigations have examined the hearing in pop musicians and their audience. Sensorineural hearing loss was only demonstrated in 5% of musicians. In our own material, we found a sensorineural hearing loss in 13% defined as a mean pure-tone threshold at 3, 4, 6, and 8 kHz of more than 20 dB HL. The hearing loss was, as expected, correlated with age, duration of exposure, military service, etc. Temporary threshold shift measurements showed that musicians were more resistant to pop music noise than the audience and that female listeners were more resistant than male listeners. The findings leave many interesting questions concerning the relationship between noise and hearing loss.

Adult↗
PubMedDate not supplied

Temporary threshold shift after exposure to noise and music of equal energy.

Ten voluntary subjects were exposed to 10 min of recorded pop music on five occasions. On five other occasions these subjects were exposed to a noise with level-, frequency-, and time-distribution characteristics, measured in octave-band steps, equal to those of the music. Measurements of temporary threshold shift showed almost equal sensitivity to the two stimuli in four subjects, whereas six others demonstrated marked differences in sensitivity. Differences were always due to more temporary threshold shift after exposure to the nonmusical noise stimulus. These findings imply that factors other than physical properties of the fatiguing sound contribute to the degree of temporary threshold shift.

Adolescent↗
PubMedDate not supplied

Metabolic control in 131 juvenile-onset diabetic patients as measured by HbA1c: relation to age, duration, C-peptide, insulin dose, and one or two insulin injections.

Glycosylated hemoglobin A (HbA1c), considered to reflect long-term metabolic control of diabetes, was analyzed in 131 patients, aged 2 5/12-19 6/12 yr, with juvenile-onset diabetes. Using stepwise multiple regression HbA1c, fasting blood glucose and plasma 3-hydroxybutyrate were analyzed as dependent variables versus independent variables such as age of the patients, duration of the disease, level of plasma immunoreactive C-peptide (IRCP), insulin dose, and number of insulin injections (one or two) per day. HbA1c was inversely related only to IRCP concentration. A low but significant, positive correlation was found between HbA1c and the duration of diabetes. Stepwise addition of the other independent variables did not further increase the fraction of explained variance. HbA1c was also correlated with a subjective rating score of the metabolic control performed by the treating physician. Fasting plasma glucose was significantly related to HbA1c but not to any of the independent variables. Fasting 3-hydroxybutyrate showed an inverse correlation to the age of the patient. The present study showed that in juvenile-onset diabetic patients, endogenous insulin secretion as reflected by IRCP was the factor best correlated with a low level of HbA1c. After the cessation of endogenous insulin secretion, there is a progressive deterioration of metabolic control and multiple injections of insulin rather than one or two per day may be needed to reach optimal control in the patients.

Adolescent↗
PubMedDate not supplied

Hearing in pop musicians.

Comparatively few previous studies have investigated the hearing of pop musicians. On the average, a surprisingly low percentage (5%) of hearing loss was demonstrated in 160 pop musicians. The present material comprises 83 musicians, with an average exposure of 9 years. Group mean hearing thresholds show only a slight deviation from normal. Age, weekly and total exposure time appear to increase the risk of hearing impairment. In the individual analysis 13-30% were found to have a sensorineural hearing loss, depending upon the definition of hearing loss. Subjects with hearing loss show a discrete impairment in the frequency range 3-8 kHz. Considering the sound levels and the length of exposure, the incidence of hearing loss is suprisingly low. Possible reasons for this are discussed.

Adolescent↗
PubMedDate not supplied

Is there a relationship between hypercholesterolaemia and noise-induced hearing loss?

Many investigators who have analysed the possible correlation between hearing loss and high serum cholesterol levels have found that hearing appears to be influenced by high blood lipids. Noise, as is well known, also influences hearing, particularly at high frequencies. It increases serum cholesterol levels during short-term experiments. The present investigation addresses the question of a possibly increased ototraumatic influence by the combination of high serum cholesterol levels and occupational noise exposure. Seventy-eight 50-year-old men with high serum cholesterol levels from a WHO study were compared with 75 50-year-old men who were randomly selected from the same WHO material. Group mean audiograms showed that hearing was similar in both groups, with a moderate high frequency hearing loss having a configuration suggestive of a noise-induced hearing loss. Analysis of the individual histories and the pure-tone audiograms showed that noise was the most predominant factor influencing hearing at any specific frequency or combination of frequencies. There was a statistically significant tendency for the high-cholesterol group that had suffered the most noise exposure, to have a high-frequency hearing loss. There was also a tendency for the low-cholesterol group to have a high-frequency loss if they had been excessively exposed to occupational noise. No further correlations were found. The present results indicate a slightly increased risk of acquiring a high-frequency sensorineural hearing loss for people who work in noisy environments and have high serum cholesterol levels.

Audiometry, Pure-Tone↗
PubMedDate not supplied

Does pop music cause hearing damage?

Relatively few investigations have so far reported on the hearing in pop musicians. In summary, these have shown a sensorineural hearing loss in 5%. This study was carried out on 83 professionals working with pop music. Depending upon how hearing loss is defined, we found a sensorineural loss in 13-30% of the pop musicians. Hearing losses were slight. It appears that the risk for hearing damage for the audience is small. A limit for presentation of the music at 95 dB (A) is suggested as a compromise satisfying both audiologists and audience.

Adolescent↗