Question

After a vigorous excercise or work we feel pain in muscles. What is the relationship between pain
and respiration?​

Answer 1

Answer:

After doing a vigorous exercise our body requires much more supply of oxygen. If our muscles do not get appropriate amount of oxygen while exercising then they start resperation anaerobically and results in formation of lactic acid due to which our muscles feel pain. If we will do it for long period then it can also cause muscle cramps.

Answer 2

Pain therefore increases heart rate, blood pressure and respiratory rate.
Explanation:
The findings suggest that pain influences respiration by increasing its flow, frequency, and volume. Furthermore, paced slow breathing is associated with pain reduction in some of the studies, but evidence elucidating the underlying physiological mechanisms of this effect is lacking
Further :

Deep breathing helps relax you. Learning deep breathing reduces muscle tension thereby lessening pain.