出版社：National Institute of Occupational Safety and Health
摘要：Noise levels were evaluated before and during aerobic sessions in 3 aerobic studios. In addition, hearing threshold levels (HTLs) of 10 female aerobic instructors with the mean (±SD) ages of 25.4 (±12.4) years were measured before and 2 min after an aerobic session. The mean (±SD) of total instruction time of these subjects was 1274.0 (±704.9) h. Before the aerobic session, noise level was 63 dB(A) and increased to 87 dB(A) during a warm-up period. The highest noise levels of 93-96 dB(A) were recorded during a peak exercise period and decreased to 73 dB(A) during a cool-down period. The dominant spectra of sound pressure levels (SPLs) during the aerobic session were in the frequency range of 1-2 kHz at levels of 75-88 dB(C). The mean values of HTL obtained for each ear of these subjects were between 5 and 15 dB in the frequency range of 1-8 kHz. No significant differences in the mean HTLs of pre-and post-aerobic sessions could be obtained. The mean values of HTL of two groups of subjects divided by their total instruction time (n =5 in each group, and p<0.01 in their total instruction time) were quite comparable.
关键词：Aerobic instructors;Hearing threshold level;Instruction time;Noise level;Octave-band center frequency
