<prompt> Sorensess and pain in muscels after vigrous exercise is due to ?HyperkalemiaLactic acidosisHypehermiaHyponatremia  <response>: Ans. isbi.e., Lactic acidosisRel Exercise physiology p. 535Immediate -onset Soreness is characterized by pain during and immediately after exercise,This type of soreness is thought to be caused by stimulation of pain receptors by metabolic by-products of cellular respiration, especially H associated with increased lactic acid levels. 