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hyponatremia due to exercise, or exercise induced hyponatremia, is multifactorial: over-hydration, poor renal clearance, SIADH thus inhibition of renal fluid clearance, and excessive Na loss through sweat.

study links rhabdomyolysis to exercise induced hyponatremia.  This article links the depletion of glycogen to muscle release of IL-6 leading to increase in ECW and thus hyponatremia. The abstract discusses fluid restriction vs hypertonic 3% NaCL to reverse the more severe cases.  The first signs are of weight gain and thus weight should be monitored.  Decreased renal output is also associated with EAH.  Altered mental status is an early sign.

event over hydration with under renal excretion can lead to hyponatremia.  SIADH and resultant increased ECW is involved.  Weight is an adequate means to evaluate--no weight loss and/or weight gain may suggest fluid overload and potential hyponatremia.