No evidence to suggest that wearing a mask during exercise offers any benefit from the droplet transfer from the virus.
“Exercising with facemasks may reduce available Oxygen and increase air trapping preventing substantial carbon dioxide exchange. The hypercapnic hypoxia may potentially increase acidic environment,cardiac overload, anaerobic metabolism and renal overload, which may substantially aggravate the underlying pathology of established chronic diseases”
Study article:
https://pubmed.ncbi.nlm.nih.gov/32590322/
21. Use of face masks by non-scrubbed operating room staff: a randomized controlled trial
Surgical site infection rates did not increase when non-scrubbed personnel did not wear face masks.
2010 Study article:
https://pubmed.ncbi.nlm.nih.gov/20575920/
22. Surgical face masks in modern operating rooms – a costly and unnecessary ritual?
When the wearing of face masks by non-scrubbed staff working in an operating room with forced ventilation seems to be unnecessary.
Study article:
https://pubmed.ncbi.nlm.nih.gov/1680906/
23. Masks: a ward investigation and review of the literature
Wearing multi layer operating room masks for every visit had no effect on nose and throat carriage rates.
Study article:
https://pubmed.ncbi.nlm.nih.gov/2873176/
24. Aerosol penetration and leakage characteristics of masks used in the health care industry
The protection provided by surgical masks may be insufficient in environments containing potentially hazardous submirconometer-sized aerosols.
“Conclusion: We conclude that the protection provided by surgical masks may be insufficient in environments containing potentially hazardous submicrometer-sized aerosols”
Study article:
https://pubmed.ncbi.nlm.nih.gov/8239046/
25. Masks for prevention of viral respiratory infections among health care workers and the public: PEER umbrella systematic review
Meta analysis review that says there is limited evidence to suggest that the use of masks may reduce the risk of spreading viral respiratory infections.
Study article:
https://pubmed.ncbi.nlm.nih.gov/32675098/
26. Modeling of the Transmission of Coronaviruses, Measles Virus, Influenza Virus, Mycobacterium tuberculosis, and Legionella pneumophila in Dental Clinics
Evidence to suggest that transmission probability is strongly driven by indoor air quality, followed by patient effectiveness and the least by respiratory protection via mask use.
So this could explain “second waves” and has nothing to do with hand shaking, or not wearing a mask.
Study article:
https://pubmed.ncbi.nlm.nih.gov/32614681/
27. Nonpharmaceutical Measures for Pandemic Influenza in Nonhealthcare Settings-Personal Protective and Environmental Measures
The use of face masks, either by infected or non infected peresons, does not have a significant effect on influenza transmission.
SO MASKS DON’T PROTECT YOU FROM ME, AND VICE VERSA.
Study article:
https://pubmed.ncbi.nlm.nih.gov/32027586/
28. Effectiveness of personal protective measures in reducing pandemic influenza transmission: A systematic review and meta-analysis
Meta analyses suggest that regular hand hygiene provided a significant protective effect over face masks and their insignificant protection.
Study article:
https://pubmed.ncbi.nlm.nih.gov/28487207/
29. Effectiveness of N95 respirators versus surgical masks against influenza: A systematic review and meta- analysis
Use of n95 respirators compared to surgical masks is not associated with a lower risk of laboratory confirmed influenza.
Study article:
https://pubmed.ncbi.nlm.nih.gov/32167245/
30. Adolescents’ face mask usage and contact transmission in novel Coronavirus
Face mask surfaces can become contamination sources. People are storing them in their pockets, bags, putting them on tables, people are reusing them etc. This is why this study is relevant:
Study article:
https://pubmed.ncbi.nlm.nih.gov/32582579/
31. Visualizing the effectiveness of face masks in obstructing respiratory jets