One 45-minute spin class averaged 8.95 times the recommended noise dose for a full 8-hour workday, with riders spending 31.6 minutes above 100 dBA, roughly double the 15-minute NIOSH guideline at that level (Sinha et al., The Laryngoscope 2017). The exposure is not limited to one studio or one decade: Australian high-intensity classes averaged 93.1 dB(A) across measurements from 1997 to 2011 (Beach and Nie, Archives of Environmental and Occupational Health 2014). Instructors carry a double load, with 41% showing temporary hearing shifts after work (Wolniakowska et al., Medycyna Pracy 2021) and 70.91% reporting chronic voice symptoms (Rumbach, Journal of Voice 2013). We aggregated data from NIOSH, the World Health Organization, the NIDCD, the U.S. Bureau of Labor Statistics, and more than 20 peer-reviewed studies in The Laryngoscope, Noise and Health, JAMA Otolaryngology and the Journal of Voice. Gyms are an unusual noise workplace because, as with the venues in our musician hearing loss statistics, the loud sound is part of the product rather than a by-product of machinery.
TL;DR
- Ambient gym noise averaged 72.05 dB SPL, second only to a cafeteria among five everyday settings tested (Kim and Han, Noise and Health 2026).
- One 45-minute spin class averaged 8.95 times the recommended 8-hour noise dose (Sinha et al., The Laryngoscope 2017).
- 50-minute aerobics classes averaged 87.1 dBA, with peaks of 90.5 to 99.7 dBA (Torre and Howell, Journal of Communication Disorders 2008).
- High-intensity Australian fitness classes averaged 93.1 dB(A) (Beach and Nie, Archives of Environmental and Occupational Health 2014).
- 41% of 29 fitness instructors showed a temporary threshold shift of 6 dB or more at 4 kHz after work (Wolniakowska et al., Medycyna Pracy 2021).
- The instructor area in Zumba classes averaged 94.4 dBA Leq, the loudest spot in the room (Razali et al., IIUM Medical Journal Malaysia 2020).
- 25.9% of spin class respondents reported ringing or muffled hearing after class (Lee et al., Noise and Health 2021).
- 70.91% of 361 group fitness instructors reported chronic voice symptoms (Rumbach, Journal of Voice 2013).
- 56% of US group fitness instructors never or almost never wear a microphone while teaching (Dacey et al., Perspectives of the ASHA SIGs 2024).
- 54.2% of fitness instructors seen at a laryngology practice had vocal fold pseudocysts (Estes et al., Journal of Voice 2020).
- Cutting volume by up to 4 dBA did not meaningfully reduce perceived exertion (Hori et al., JAMA Otolaryngology 2026).
1. How Loud Group Fitness Classes Get
Three decades of measurements on three continents converge on the same band: class averages from the high 80s to the mid 90s dBA, with peaks well above 100. The consistency is the finding. Beach and Nie compared Australian classes in 1997 to 1998 and 2009 to 2011 and titled their paper “Noise levels in fitness classes are still too high”, because a decade of awareness had barely moved the needle for high-intensity formats.
The cycling studio is the extreme case. In Boston, the loudest of 17 spin classes reached 116.7 dBA, and the average rider spent 31.6 minutes of a roughly 49-minute class above 100 dBA, about 2.1 times (31.6 / 15) the NIOSH daily guideline of 15 minutes at that level (Sinha et al., The Laryngoscope 2017). A sound level that would trigger a hearing conservation program in a factory is, in a studio, the selling point.
| Metric | Value | Source |
|---|---|---|
| Maximum level recorded in 17 Boston spin classes | 116.7 dBA | Sinha et al., The Laryngoscope 2017 |
| Average time per class above 100 dBA | 31.6 ± 3.8 minutes (class length 48.9 ± 1.2 minutes) | Sinha et al., The Laryngoscope 2017 |
| Noise dose of one 45-minute spin class | 8.95 ± 1.2 times the recommended 8-hour dose | Sinha et al., The Laryngoscope 2017 |
| Average level, high-intensity fitness classes (Australia) | 93.1 dB(A) | Beach and Nie, Archives of Environmental and Occupational Health 2014 |
| Average level, low-intensity classes, 1997-1998 vs 2009-2011 | 88.9 to 85.6 dB(A) | Beach and Nie, Archives of Environmental and Occupational Health 2014 |
| Spin classes exceeding the NIOSH 94 dBA one-hour guideline | 3 of 18 classes | Lee et al., Noise and Health 2021 |
| Mean level of 50-minute aerobics classes | 87.1 dBA (range 83.4 to 90.7 dBA), peaks 90.5 to 99.7 dBA | Torre and Howell, Journal of Communication Disorders 2008 |
Context note: the Australian dataset, the most recent available multi-site class survey (2014), covered 35 low-intensity and 65 high-intensity classes (Beach and Nie 2014). Low-intensity classes fell by 3.3 dB(A) (88.9 minus 85.6) between the two periods, while high-intensity formats did not show the same improvement.
2. Instructor Daily Noise Dose vs the NIOSH 85 dBA REL
NIOSH sets its recommended exposure limit at 85 dBA averaged over an eight-hour day and halves the allowed time for every 3 dBA increase (NIOSH, About Occupational Noise 2026). Under that rule a class at 94 dBA uses a full day’s allowance in one hour (8 hours at 85 dBA, halved three times at 88, 91 and 94 dBA), which means the instructor teaching back-to-back sessions is the most exposed person in the building, not the member attending twice a week.
The dosimetry backs that up. Polish instructors measured across 8 clubs worked at 76.3 to 96.0 dBA, mean 87.1 dB (Wolniakowska et al., Medycyna Pracy 2021). In Malaysian Zumba sessions, the instructor area logged a 94.4 dBA Leq and 48.0% of a full noise dose in a single one-hour class, versus 7.8% at the back of the room (Razali et al., IIUM Medical Journal Malaysia 2020). Workload varies widely, which is why averages hide the full-time teacher: 12% of 256 surveyed fitness instructors worked more than 30 hours a week (Merati et al., Frontiers in Public Health 2021).
| Metric | Value | Source |
|---|---|---|
| NIOSH recommended exposure limit | 85 dBA over 8 hours, time halved per 3 dBA increase | NIOSH, About Occupational Noise 2026 |
| Instructor workplace noise, 29 instructors in 8 clubs | 76.3 to 96.0 dBA (mean 87.1 dB) | Wolniakowska et al., Medycyna Pracy 2021 |
| Individual measurements exceeding the 85 dB maximum admissible intensity | 12% | Wolniakowska et al., Medycyna Pracy 2021 |
| Zumba instructor area, mean per one-hour class | 94.4 dBA Leq, 48.0% dose, 85.8 dBA TWA | Razali et al., IIUM Medical Journal Malaysia 2020 |
| Loudest single instructor (Instructor A) | 97.4 dBA Leq, 78.6% dose, 30 seconds above 115 dBA | Razali et al., IIUM Medical Journal Malaysia 2020 |
| Peak exercise period in Japanese aerobic studios | 93 to 96 dB(A) | Mirbod et al., Industrial Health 1994 |
| Full-time Singapore group exercise instructors | 95.9 dBA average, 19.5 hours per week, 805% of recommended annual exposure | Teo, NUS Audiology thesis presentation 2015 |
| Fitness instructors working more than 30 hours per week | 12% (37% work 10 to 30 hours, 51% under 10 hours) | Merati et al., Frontiers in Public Health 2021 |
Outlier note: dance teachers in Porto Alegre averaged 85.19 dB(A) in the final minutes of class with a mean teaching load of 4.48 hours per day, and street dance classes ran highest at up to 91.33 dB(A) (Nehring et al., International Archives of Otorhinolaryngology 2013). For how these numbers compare with industrial settings, see our occupational noise exposure in manufacturing statistics, and for why smartphone and dosimeter readings differ, our sound level meter statistics. The Singapore figures come from a thesis presentation with 21 instructors and should be read as indicative.
3. Hearing Effects: Temporary Shifts, Tinnitus and Symptoms
The hearing data from gyms is mostly about short-term change, and that is the honest limit of the evidence. Temporary threshold shifts and post-class ringing are early warnings, not diagnoses: NIDCD notes that temporary noise-related hearing loss may disappear 16 to 48 hours later, though residual long-term damage may remain (NIDCD, Noise-Induced Hearing Loss 2025). What the studies show is that a single ordinary class is enough to produce a measurable shift.
41% of instructors showed a temporary threshold shift of 6 dB or more at 4 kHz after their shift in the Polish cohort, measured across 116 pre- and post-exposure audiograms. Among participants, roughly one in four reports symptoms: 25.9% of spin respondents described ringing or muffled hearing after class (Lee et al., Noise and Health 2021). That is a symptom rate produced by a voluntary leisure activity, in a room where almost nobody wears protection.
| Metric | Value | Source |
|---|---|---|
| Instructors with temporary threshold shift of 6 dB or more at 4 kHz | 41% of 29 | Wolniakowska et al., Medycyna Pracy 2021 |
| Hearing after a 60-minute aerobics class at 89.6 dB(A) (± 4.7) | Significant TTS at all frequencies except 1,000 Hz in 14 exposed subjects | Nassar, British Journal of Audiology 2001 |
| Outer hair cell function after 50-minute aerobics classes | Post-class otoacoustic emissions lower, significant drop at 6000 Hz | Torre and Howell, Journal of Communication Disorders 2008 |
| Spin respondents reporting ringing or muffled hearing after class | 25.9% | Lee et al., Noise and Health 2021 |
| Participants who ever experienced post-class tinnitus | 14.8% (28 of 189) | Hori et al., JAMA Otolaryngology 2026 |
| Zumba regulars nearest the speakers, right ear 4000 to 8000 Hz | About 40 dBHL average threshold | Razali et al., IIUM Medical Journal Malaysia 2020 |
| US adults under 70 with hearing-test features suggesting noise-induced hearing loss | At least 10 million (6%), possibly up to 40 million (24%) | NIDCD, Noise-Induced Hearing Loss 2025 |
Counterpoint: not every study finds a shift. Japanese aerobic instructors had thresholds of 5 to 15 dB across 1 to 8 kHz with no significant pre- to post-session difference (Mirbod et al., Industrial Health 1994), and the Malaysian authors could not rule out age-related hearing loss in their speaker-side group. The early studies are small; the Nassar result comes from a 14-person exposed group. Most recent available data on instructor audiometry: Wolniakowska et al., 2021.
4. Voice Disorders Among Fitness Instructors
Loud music turns a hearing problem into a voice problem. An instructor cueing over 90-plus dBA while exercising is doing a version of the Lombard effect under cardiovascular load, which is why voice symptoms in this group run far above the general population. NIDCD puts the US adult rate at 7.6%, or 17.9 million adults, reporting a voice problem in the past 12 months (NIDCD, Quick Statistics About Voice, Speech, and Language).
Against that baseline, the fitness numbers are striking. 70.91% of 361 Australian group fitness instructors reported chronic voice symptoms, and 9.97% had experienced complete voice loss after teaching (Rumbach, Journal of Voice 2013). The caveat is method: almost all of these figures are self-reported, while formally diagnosed dysphonia is far rarer, at 5.08% in a New York and Vermont survey. Our vocal fold nodules in teachers and singers statistics cover the clinical side of other occupational voice users.
| Metric | Value | Source |
|---|---|---|
| Group fitness instructors reporting acute / chronic voice symptoms | 78.95% / 70.91% (n = 361) | Rumbach, Journal of Voice 2013 |
| Partial voice loss or hoarseness during / after instruction | 57.62% / 46.81% | Rumbach, Journal of Voice 2013 |
| Instructors reporting chronic hoarseness | About 39% | Rumbach et al., International Journal of Speech-Language Pathology 2015 |
| French sports and fitness instructors reporting vocal difficulties | 55% of 320 | Fontan et al., Journal of Voice 2017 |
| US group fitness instructors reporting a voice problem since entering the industry | 46% of 52 | Dacey et al., Perspectives of the ASHA SIGs 2024 |
| Aerobics instructors with partial or complete voice loss during or after instructing | 44% of 54 | Long et al., Journal of Voice 1998 |
| Sporting, fitness and wellness leaders with a formal dysphonia diagnosis | 5.08% (3 participants) | Gauvin et al., Logopedics Phoniatrics Vocology 2022 |
| US adults reporting a voice problem in the past 12 months | 7.6% (17.9 million) | NIDCD, Quick Statistics About Voice, Speech, and Language |
Context note: the 2015 follow-up linked chronic hoarseness to younger age, partial voice loss during or after teaching, and using a voice louder than normal speech while teaching (Rumbach et al. 2015). The French survey also tied voice handicap to noise and music at work, according to Fontan et al. 2017. Most recent available prevalence data from a large instructor sample: Rumbach, 2013.
5. Diagnosis, Treatment and the Voice Care Gap
The problem is not awareness of symptoms, it is what instructors do next. In the 2024 ASHA pilot, 24 of 52 instructors reported a voice problem, but only 4 of those 24 (16.7%) received treatment, and 25% of respondents said they would ignore a voice problem lasting more than two weeks and hope it improved (Dacey et al., Perspectives of the ASHA SIGs 2024). The cheapest fix is also underused: 56% of instructors never or almost never wear a microphone.
When instructors do reach a voice clinic, the pathology is serious. A New York laryngology review of 24 fitness instructors found pseudocysts in 54.2%, and 40% of those who chose surgery had a postoperative recurrence (Estes et al., Journal of Voice 2020). Training lags behind: only 30% of Australian instructors had any voice education, while 98.06% agreed it should be standard (Rumbach, Journal of Voice 2013).
| Metric | Value | Source |
|---|---|---|
| Instructors with a voice problem who received treatment | 4 of 24 (16.7%) | Dacey et al., Perspectives of the ASHA SIGs 2024 |
| Instructors who never or almost never wear a microphone | 56% | Dacey et al., Perspectives of the ASHA SIGs 2024 |
| Would see a laryngologist for a voice problem over 2 weeks / ignore it | 9.6% / 25% | Dacey et al., Perspectives of the ASHA SIGs 2024 |
| Fitness instructors at a voice clinic with pseudocysts / polyps | 54.2% / 20.8% (n = 24) | Estes et al., Journal of Voice 2020 |
| Chose surgery after behavioral management failed / recurrence after surgery | 41.7% / 40% | Estes et al., Journal of Voice 2020 |
| Diagnosed instructors treated with voice therapy alone / who changed teaching practice | 73.68% / 82% (n = 38) | Rumbach, Journal of Voice 2013 (treatment study) |
| Instructors who had received information on vocal difficulties / wanted prevention programs | 37% / 80% | Fontan et al., Journal of Voice 2017 |
Context note: attitudes may be part of the gap. In a 2025 survey of 69 sporting, fitness and wellness leaders, 87.93% reported not being concerned about their voice even though 72.7% reported a change such as pitch or vocal quality (Reynolds et al., Journal of Voice 2025). The treatment study of 38 diagnosed instructors also found more than 65% dissatisfied with industry and coworker support (Rumbach 2013, treatment study). A small 2024 trial of a structured voice exercise protocol cut one group’s vocal effort score from 6.17 to 1.44 by day 14 (P = 0.043), though only 25 of 36 instructors completed it (Davis et al., Journal of Voice 2024).
6. Participants: Attitudes, Preferences and Hearing Protection
Participants do not uniformly want it loud, and the people setting the volume are not a neutral sample. About 85% of instructors found loud music motivating, while roughly one fifth of clients found it stressful, a gap that held across both Australian measurement periods. Complaints also climb with the dial: the share rating music too loud was about 3.5 times higher (32.4 / 9.3) in the loudest third of the Baltimore classes than in the quietest third.
Protection, meanwhile, is close to zero: in the 2026 Los Angeles study, just 4 of 189 participants consistently wore it. The exposure also reaches more people than the “spin fanatic” stereotype suggests: 71.43% of a 175-person listener cohort attended fitness classes, including 85.71% of women (Adson et al., Noise and Health 2022).
| Metric | Value | Source |
|---|---|---|
| Respondents rating music too loud, loudest vs quietest third of classes | 32.4% vs 9.3% | Lee et al., Noise and Health 2021 |
| Instructors who find loud music motivating / clients who find it stressful | About 85% / about one fifth | Beach and Nie, Archives of Environmental and Occupational Health 2014 |
| Participants consistently using hearing protection | 2.1% (4 of 189) | Hori et al., JAMA Otolaryngology 2026 |
| Listener cohort attending fitness classes (women / men) | 71.43% overall (85.71% / 46.03%) | Adson et al., Noise and Health 2022 |
| Fitness participants surveyed on music and motivation | 249; too-soft music more often seen as demotivating than too-loud | Kammerer et al., Perspectives of the ASHA SIGs 2022 |
| Gym ambient noise / preferred earphone level for dance music in the gym | 72.05 dB SPL / 74.85 dB SPL (LCpeak 93.50 dB SPL) | Kim and Han, Noise and Health 2026 |
Context note: the motivation survey found that class size, schedule, difficulty and instructor attitude influenced motivation more than music level, and that participants rarely tried to change the sound environment (Kammerer et al., Perspectives of the ASHA SIGs 2022). Members who bring earphones add a second layer: young adults set their highest preferred listening level of any condition tested for dance music in the gym (Kim and Han, Noise and Health 2026).
7. Turning It Down: Volume Reduction Evidence and Listening Limits
The industry’s core assumption, that loud music drives harder workouts, has now been tested twice and failed both times. A 2026 noninferiority study found that quieter classes did not meaningfully reduce perceived exertion for volume cuts of up to 4 dBA (Hori et al., JAMA Otolaryngology 2026). The Baltimore spin study reached the same conclusion five years earlier with a 3 dB cut, which makes this one of the few hearing interventions with two independent studies and no measurable cost to the product.
The University of Maryland team behind the Baltimore study described a 2 to 3 dB reduction as about a 50% reduction in power and a 20% reduction in perceived loudness (University of Maryland School of Medicine, press release 2021). For venues with amplified music, the WHO benchmark is a maximum average of 100 decibels plus monitoring and free hearing protection (WHO, Global Standard for Safe Listening Venues and Events 2022). That ceiling is written for audiences at concerts and clubs; it does not replace the occupational limits that apply to the instructor teaching several classes a day.
| Metric | Value | Source |
|---|---|---|
| Mean level, louder vs quieter classes (2025 measurements) | 91.4 dBA (95% CI, 91.1-91.9) vs 88.5 dBA (95% CI, 88.0-88.9) | Hori et al., JAMA Otolaryngology 2026 |
| Difference in perceived exertion (Borg CR-10), quieter vs louder | β = -0.66 (97.5% CI, -1.09 to -0.22), noninferiority threshold -1.5 | Hori et al., JAMA Otolaryngology 2026 |
| Spin respondents rating intensity high, middle vs upper volume tercile | 67.1% vs 71.8% (P = 0.53) | Lee et al., Noise and Health 2021 |
| Effect of a 2 to 3 dB reduction | About 50% less power, about 20% lower perceived loudness | University of Maryland School of Medicine, press release 2021 |
| NIOSH exposure guidance for one hour / at 100 dB | 94 dB for one hour / limit to 15 minutes | University of Maryland School of Medicine, press release 2021 |
| WHO safe listening venue standard | Maximum average sound level of 100 decibels, 6 recommended features | WHO, Global Standard for Safe Listening Venues and Events 2022 |
| People aged 12 to 35 at risk of hearing loss from loud recreational sound | Over 1 billion | WHO, Global Standard for Safe Listening Venues and Events 2022 |
Context note: the scale of the workforce is not trivial. The U.S. Bureau of Labor Statistics counts 388,400 fitness trainer and instructor jobs in 2025, with about 68,000 openings a year projected to 2035 (BLS, Occupational Outlook Handbook). The difference between the two classes in the 2026 study was 2.9 dBA (91.4 minus 88.5). Note that the Baltimore classes were set 3 dB lower in week two after a proposed 6 dB cut was not agreed to, so studios have never been tested at the larger reduction.
Summary: Gym and Fitness Class Noise Exposure by the Numbers
| Metric | Value | Source |
|---|---|---|
| Noise dose of one 45-minute spin class | 8.95 times the 8-hour recommended dose | Sinha et al., The Laryngoscope 2017 |
| Average high-intensity fitness class level | 93.1 dB(A) | Beach and Nie, Archives of Environmental and Occupational Health 2014 |
| Mean aerobics class level / peaks | 87.1 dBA / 90.5 to 99.7 dBA | Torre and Howell, Journal of Communication Disorders 2008 |
| NIOSH recommended exposure limit | 85 dBA over 8 hours | NIOSH, About Occupational Noise 2026 |
| Instructors with temporary threshold shift at 4 kHz | 41% | Wolniakowska et al., Medycyna Pracy 2021 |
| Zumba instructor area per one-hour class | 94.4 dBA Leq, 48.0% dose | Razali et al., IIUM Medical Journal Malaysia 2020 |
| Instructors working more than 30 hours per week | 12% | Merati et al., Frontiers in Public Health 2021 |
| Spin respondents with post-class ringing or muffled hearing | 25.9% | Lee et al., Noise and Health 2021 |
| Instructors with chronic voice symptoms | 70.91% | Rumbach, Journal of Voice 2013 |
| French instructors with vocal difficulties | 55% | Fontan et al., Journal of Voice 2017 |
| US instructors who never or almost never use a microphone | 56% | Dacey et al., Perspectives of the ASHA SIGs 2024 |
| Pseudocysts among instructors at a voice clinic | 54.2% | Estes et al., Journal of Voice 2020 |
| US adults with a voice problem in the past 12 months | 7.6% | NIDCD, Quick Statistics About Voice, Speech, and Language |
| Participants consistently using hearing protection | 2.1% | Hori et al., JAMA Otolaryngology 2026 |
| Listener cohort attending fitness classes | 71.43% | Adson et al., Noise and Health 2022 |
| Gym ambient noise | 72.05 dB SPL | Kim and Han, Noise and Health 2026 |
| WHO maximum average level for safe listening venues | 100 decibels | WHO, Global Standard for Safe Listening Venues and Events 2022 |
| US fitness trainer and instructor jobs, 2025 | 388,400 | BLS, Occupational Outlook Handbook |
Methodology and Sources
- Sinha et al., Cycling exercise classes may be bad for your (hearing) health, The Laryngoscope 2017
- Beach and Nie, Noise levels in fitness classes are still too high, Archives of Environmental and Occupational Health 2014
- Hori et al., Lower Music Volume Levels in Fitness Class and Perceived Exercise Intensity, JAMA Otolaryngology-Head and Neck Surgery 2026
- Lee et al., Music level preference and perceived exercise intensity in group spin classes, Noise and Health 2021
- University of Maryland School of Medicine, spin class music volume press release 2021
- Torre and Howell, Noise levels during aerobics and the potential effects on distortion product otoacoustic emissions, Journal of Communication Disorders 2008
- Wolniakowska et al., Noise exposure and temporary hearing changes in fitness instructors, Medycyna Pracy 2021
- Razali et al., Noise Exposure and Hearing Threshold Profile among Zumba Fitness Regulars, IIUM Medical Journal Malaysia 2020
- Mirbod et al., Noise in aerobic facilities, Industrial Health 1994
- Nassar, Temporary threshold shift after 60 minutes of aerobics class noise, British Journal of Audiology 2001
- Teo, NIHL prevention education in group exercise instructors, NUS Audiology thesis presentation 2015
- Nehring et al., Classroom sound pressure level among dance teachers in Porto Alegre, International Archives of Otorhinolaryngology 2013
- Merati et al., Occupational Disorders, Daily Workload, and Fitness Levels Among Fitness and Swimming Instructors, Frontiers in Public Health 2021
- NIOSH, About Occupational Noise 2026 and NIOSH, Understanding Noise Exposure Limits
- NIDCD, Noise-Induced Hearing Loss 2025
- NIDCD, Quick Statistics About Voice, Speech, and Language
- Rumbach, Vocal problems of group fitness instructors: prevalence of self-reported voice symptoms, Journal of Voice 2013
- Rumbach, Voice problems of group fitness instructors: diagnosis, treatment and attitudes, Journal of Voice 2013
- Rumbach et al., Voice problems in the fitness industry: factors associated with chronic hoarseness, International Journal of Speech-Language Pathology 2015
- Fontan et al., Vocal Problems in Sports and Fitness Instructors in France, Journal of Voice 2017
- Dacey et al., Perceptions Around Vocal Health Among Group Fitness Instructors, Perspectives of the ASHA Special Interest Groups 2024
- Long et al., Voice problems and risk factors among aerobics instructors, Journal of Voice 1998
- Gauvin et al., Vocal health of sporting, fitness, and wellness leaders in Northern New York and Vermont, Logopedics Phoniatrics Vocology 2022
- Estes et al., Phonotraumatic Injury in Fitness Instructors, Journal of Voice 2020
- Reynolds et al., Voice-Related Concerns of Sporting, Fitness, and Wellness Leaders, Journal of Voice 2025
- Davis et al., Structured Voice Exercise Protocol in Fitness Instructors, Journal of Voice 2024
- Kammerer et al., Is Loud Music in Fitness Classes a Motivator or Demotivator?, Perspectives of the ASHA Special Interest Groups 2022
- Adson et al., A Comparison of Self-Reported Nonoccupational Noise Exposure in a Large Cohort of Listeners, Noise and Health 2022
- Kim and Han, Real-Time Synchronized Measurement of Preferred Listening Levels, Noise and Health 2026
- WHO, Global Standard for Safe Listening Venues and Events 2022
- U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Fitness Trainers and Instructors
- Data watch: most class-level and instructor data predates 2023 and comes from small samples (9 to 100 classes, 10 to 361 instructors), so treat them as the most recent available data rather than current industry averages. Measurement methods differ: the Boston study used smartphone meters calibrated to within 2 dBA, the Baltimore study reports both dBA and dBC, and Kim and Han report unweighted dB SPL, so values are not directly interchangeable. The Malaysian paper benchmarks against Malaysian noise regulations rather than NIOSH, so its dose percentages are not NIOSH doses. The Baltimore paper reports 1.4% earplug use in its results but mentions one respondent in its discussion; Merati et al. report a voice-symptom direction in the discussion that conflicts with their results. A 108 dBA peak attributed to the 2026 JAMA study by trade press does not appear in the abstract, so it was left out. Fitness-industry music volume guidelines (such as Australian and IDEA recommendations) could not be verified against a primary page this quarter and are not cited. Voice prevalence figures are self-reported except the Estes et al. clinical series and the 5.08% diagnosis rate.
Last updated: October 18, 2026. We update this roundup quarterly, and the next refresh is expected when the World Health Organization publishes its World Hearing Day 2027 materials in March 2027.