How to raise pH without generating CO2
I don't think this question has an answer.  First, muscle soreness is not caused by lactic acid.   Second, distance runners run aerobically, meaning very little lactic acid would be generated by running in the first place.  (Sprinters are the exception here.)  Third, even if lactic acid buildup was a problem (which it isn't), both the cellular cytoplasm and human bloodstream are very well-buffered.  The cytoplasm is primarily buffered by potassium glutamate and the circulation by bicarbonate (created from respiration).  Production of "lactic acid" would really be production of lactate salts.