《伤寒论·平脉法》
趺阳脉微而紧，紧为里寒，微为气虚。微紧相合，为脾胃虚寒、中气不足，所以产生短气。
肤阳脉微而紧，紧则为寒，微则为虚，微紧相搏，则为短气。
The diyang pulse is faint and tight, tightness indicates interior coldness while faintness indicates qi deficiency. When faintness and tightness appear together, it means spleen-stomach qi deficiency, insufficient middle qi, giving rise to shortness of breath.