Lee Lawrance, Shuster Benjamin, Song Yang, Kujawa Sharon G, Depireux Didier, Hertzano Ronna
Department of Otolaryngology, Head and Neck Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA.
Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA.
Noise Health. 2021 Jan-Mar;23(108):42-49. doi: 10.4103/nah.NAH_65_20.
Sound levels in fitness classes often exceed safe levels despite studies that show many participants find high sound levels stressful.
The objective is to determine if lower sound levels in spinning classes significantly impact exercise intensity and to determine if class participants prefer the music played at lower levels.
Observational study of 1-hour group spin classes.
Sound levels were measured in 18 spin classes over two weeks. No adjustments were made in week-1 and sound levels were decreased by 3 dB in week-2. Participant preferences and data on post-class hearing changes were collected via post-class questionnaires (n = 213) and divided into three terciles based on the total sound exposure of corresponding classes.
Unweighted survey generalized linear models are used to sort the causal relationships between different variables simultaneously and participant responses. The Chi-square test is used to reveal statistically significant relationships between two or more categorical variables.
When mean sound levels exceeded 98.4 dBC, respondents were 23 times more likely to report the music as too loud than too quiet (P < 0.05), and four times more likely to prefer a decrease, rather than an increase, in sound level (P < 0.05). There was no significant difference in respondents reporting high exercise intensity between the middle (95.7-98.1 dBC) and upper (98.4-101.0 dBC) terciles, 67.1% and 71.8%, respectively (P = 0.53). Overall, 25.9% of respondents reported auditory symptoms following classes. Analysis in the context of dBA and dBC produced congruent conclusions and interpretations.
Sound levels in many fitness classes remain dangerously high. However, music level can be lowered without a significant impact on perceived exercise intensity and many participants prefer lower sound levels than current levels.
尽管研究表明许多参与者认为高声级会带来压力，但健身课程中的声级往往超过安全水平。
目的是确定动感单车课程中较低的声级是否会显著影响运动强度，以及课程参与者是否更喜欢较低声级播放的音乐。
对1小时的团体动感单车课程进行观察性研究。
在两周内对18节动感单车课程进行了声级测量。第1周未进行调整，第2周声级降低了3分贝。通过课后问卷（n = 213）收集参与者的偏好以及课后听力变化数据，并根据相应课程的总声暴露将其分为三个三分位数。
未加权调查广义线性模型用于同时梳理不同变量与参与者反应之间的因果关系。卡方检验用于揭示两个或多个分类变量之间的统计学显著关系。
当平均声级超过98.4分贝C时，受访者报告音乐声音太大的可能性是太小的23倍（P < 0.05），并且更喜欢降低声级而非提高声级的可能性是4倍（P < 0.05）。在中间三分位数（95.7 - 98.1分贝C）和上部三分位数（98.4 - 101.0分贝C）中，报告高运动强度的受访者之间没有显著差异，分别为67.1%和71.8%（P = 0.53）。总体而言，25.9%的受访者在课程结束后报告有听觉症状。在分贝A和分贝C的背景下进行的分析得出了一致的结论和解释。
许多健身课程中的声级仍然高得危险。然而，可以降低音乐声级，而不会对感知到的运动强度产生显著影响，并且许多参与者更喜欢低于当前水平的声级。
