You should definitely take it straight to a vet!
your guinea pig might need a check up take her to the vet and try and get some vitamin C into her/him
These are diaphragm and externa intercostal muscles in quiet breathing and sternocliedomastoid ,sclene muscles,anterior serrati in heavy breathing
It means that the guinea pig is scared or it doesn't get enough water when its twitching its kinda like when a dog growls but they wont bite you or they should not well when it wimpers its trying to communicate with you or if you have other guinea pigs...-SycoBob
heavy breathing occurs to breathe out the acid (CO2) in an attempt to correct the acidosis.
heavy breathing as you call it , in an engine would mostly be caused by a filthy air cleaner or a blocked air intake
they weigh about 700-900g
Yes, breathing heavy is the body trying to recover more oxygen. It happens during exercise such as running as your body tries to recover the lost oxygen.
aches in the muscles and heavy breathing
lactation of the nipples and heavy breathing.
dying
Heavy breathing can be a sign of many things, including that she may be in labor and ready to have her foal. Heavy breathing most commonly means the horse is uncomfortable or has exercised heavily. Mares who are in labor will breathe heavily. Mares who have a foal inside them that is in an awkward position will also be uncomfortable and sometimes breathe heavily.
If you have a heavy chest feeling that is not tight and you are having no breathing issues, it should still be checked out. It could be something as simple as acid reflux but it could be more severe.