"no actual reduced inflow of air due to mask wearing, certainly not one that you would detect physiologically."
Depends on how you measure it and what you mean by physiologically detect. Generally, the resistance of breathing through a ("good") mask is not automatically detectable, but does exist and one could detect it if they are attentive. Your body tends to increase tidal volume and/or respiration rate because of the rebreathing of the stale under the mask. There are certainly studies that measure the physiological effects, such that we set 15 minute and 8 hour limits on CO2 exposure etc.
Granted it's largely not an issue, but it's not necessarily correct to say that it offers no restriction and no physiological changes.
"EDIT: other commenters response to this comment made me go look up some original research on the topic. As a result, I fully retract what I've said below. I found several papers that report substantial restrictions of airflow from wearing a correctly fitted N95 mask."
Depends on how you measure it and what you mean by physiologically detect. Generally, the resistance of breathing through a ("good") mask is not automatically detectable, but does exist and one could detect it if they are attentive. Your body tends to increase tidal volume and/or respiration rate because of the rebreathing of the stale under the mask. There are certainly studies that measure the physiological effects, such that we set 15 minute and 8 hour limits on CO2 exposure etc.
Granted it's largely not an issue, but it's not necessarily correct to say that it offers no restriction and no physiological changes.