<prompt> Sorensess and pain in muscels after vigrous exercise is due to -HyperkalemiaLactic acidosisHyperthermiaHyponatremia  <response>: Ans. is b i.e., Lactic acidosis o Immediate-onset Soreness is characterized by pain during and immediately after exercise.o 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 incereased lactic acid levels. 