Risques de contaminations en salle de gym?

[Nutrimuscle-Conseils]

Randomized Re-Opening of Training Facilities during the COVID-19 pandemic
TRAiN study group,
Michael Bretthauer medRxiv June 25, 2020.

Background: Most countries closed training facilities during the COVID-19 pandemic. This may have negative consequences for peoples health and wellbeing. We investigated SARS-CoV-2 virus transmission and COVID-19 disease attributable to training facilities.

Methods: we randomized members 18 to 64 years with no COVID-19 relevant comorbidities at five training facilities in Oslo, Norway to access or no access to their facility. Facilities were opened from May 22, 2020 for individuals randomized to training, applying increased social distancing (1 meter for floor exercise, 2 meters for high-intensity classes), enhanced hand and surface hygiene. Locker rooms were open, showers and saunas were closed. We compared SARS-CoV-2 PCR status by self-administered naso-, oropharyngeal and sputum sampling after two weeks and clinical disease by linkage to electronic patient records after three weeks.

Results: 3,764 individuals were randomized and included in analyses; 1,896 in the training and 1,868 in no-training arms. In the training arm, 81.8 percent trained at least once at the facilities. Out of 3,016 individuals who returned the SARS-CoV-2 PCR tests, there was one positive test. The positive individual was randomized to training, but had not used the facility before testing day. Contact tracing revealed the workplace as transmission source. A total of 106 individuals had outpatient hospital visits, and six individuals were admitted to hospital during the three weeks after intervention start, with no differences between arms. There were no outpatient visits or hospital admissions due to COVID-19 in either group.

Conclusions: Provided good hygiene and social distancing measures, there was no increased COVID-19 spread at training facilities.

[Nutrimuscle-Conseils]

Prospective study of bacterial and viral contamination of exercise equipment
Kirsten A Goldhammer Clin J Sport Med. 2006 Jan;16(1):34-8.

Objective: Transmission of bacterial and viral pathogens is known to occur by hand contact with fomites. Exercise equipment in public facilities may serve as such fomites. It is not known whether equipment disinfection might reduce microorganism colonization. We performed studies to address these issues.

Design: Observational study of bacterial and viral culture results from hand-contact surfaces of exercise equipment, pre-exercise and postexercise; prospective study of viral culture results before and after intervention with disinfection solution.

Setting: Two fitness centers in a military community.

Intervention: One week trial of twice-a-day equipment disinfection.

Main outcome measures: Type and number of bacteria and type of viruses present on equipment before and after exercise; prevalence of viral culture positivity on equipment before and after intervention.

Results: Bacterial cultures of body contact surfaces on equipment revealed benign bacterial species (coagulase-negative staphylococci, diphtheroids, and so forth) but no pathogenic bacteria whether obtained pre-exercise or postexercise, or whether from aerobic versus weight training equipment. Viral cultures revealed the presence of viruses (generally rhinoviruses) on 63 of 100 (63%) hand-contact surfaces of equipment. Weight equipment was significantly more often contaminated than aerobic equipment (73% vs. 51%; P = 0.026). Disinfection of equipment did not lower the prevalence of virus isolation (48% positive before cleaning; 86% positive after cleaning).

Conclusions: There is little risk of exposure to pathogenic bacteria on exercise equipment. Such equipment may commonly serve as fomites for the transmission of viruses. These data do not suggest that disinfection of exercise equipment will offer significant protective effects against virus exposure.

[Nutrimuscle-Conseils]

Infection risk in gyms during physical exercise
Environmental Science and Pollution Research 25(12) July 2018
Alexandro Andrade

This study aimed to analyze the risk of infection (influenza and tuberculosis) for individuals participating in physical exercise. This was achieved by assessment of carbon dioxide (CO2) concentrations, and examination of the physical characteristics of a number of gyms to determine whether there was a relationship to CO2 levels. This study was performed in three different gyms ventilated with either split system or central system air conditioners. The risk of airborne infection (percent of susceptible persons infected) was estimated for each gym using the Wells-Riley model. The risk of infection increased during periods of peak occupancy where the ventilation required by occupants was greater. In each gym, the highest risk of infection occurred during the evening where occupancy and CO2 levels were high.

The infection risk for influenza was high in all situations due to the high quantum generation rate for this agent. This study suggests that inefficient ventilation in gyms is a significant problem, with high CO2 concentrations resulting in impaired air quality and high health risks to users, including increased risk of infections such as influenza and tuberculosis.

[Nutrimuscle-Diététique]

Traduction de l'étude

Risque d'infection dans les gymnases pendant l'exercice physique
Science de l'environnement et recherche sur la pollution 25 (12) juillet 2018
Alexandro Andrade

Cette étude visait à analyser le risque d'infection (grippe et tuberculose) pour les personnes participant à l'exercice physique. Cet objectif a été atteint par l'évaluation des concentrations de dioxyde de carbone (CO2) et l'examen des caractéristiques physiques d'un certain nombre de gymnases pour déterminer s'il y avait une relation avec les niveaux de CO2. Cette étude a été réalisée dans trois gymnases différents ventilés avec un système split ou des climatiseurs à système central. Le risque d'infection aéroportée (pourcentage de personnes sensibles infectées) a été estimé pour chaque salle de sport à l'aide du modèle Wells-Riley. Le risque d'infection augmentait pendant les périodes de pointe d'occupation où la ventilation requise par les occupants était plus élevée. Dans chaque gymnase, le risque d'infection le plus élevé est survenu pendant la soirée où l'occupation et les niveaux de CO2 étaient élevés.

Le risque d'infection pour la grippe était élevé dans toutes les situations en raison du taux de génération quantique élevé de cet agent. Cette étude suggère qu'une ventilation inefficace dans les gymnases est un problème important, avec des concentrations élevées de CO2 entraînant une altération de la qualité de l'air et des risques élevés pour la santé des utilisateurs, y compris un risque accru d'infections telles que la grippe et la tuberculose.