yes, any brand would suffice-- problem with altitude/sickness is that your body cant get enough oxygen, so by breathing pure (or almost pure) oxygen, your body can increase its oxygen content which reduces the severity of altitude sickness-- you can use it any time, walking, sitting, whatever -- I honestly have no clue how much benefit you get from one can-- that would depend on how your body handles it and how much it can take in-- each person is going to be different on how their body handles it --- as an added benefit, if used while hiking, it can also reduce the "muscle burn"
Altitude sickness. Altitude sickness, the mildest form being acute mountain sickness (AMS), is the negative health effect of high altitude, caused by rapid exposure to low amounts of oxygen at high elevation. Symptoms may include headaches, vomiting, tiredness, trouble sleeping, and dizziness.
When oxygen to our muscles is limited, our body can't keep up with breaking down the hydrogen ions fast enough. The buildup of hydrogen ions makes the environment acidic causing our muscles to burn.