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I too have noticed being short of breath after a relatively small amount of exertion. But I have also found that if I continue the exerting activity I do eventually equilabrate and can sustain the activity for quite some time. My question is, has anyone else noticed a similar phenomenon? Part of PD is disturbances of the autonomic nervous system and the inability to rapidly adjust cardiac output realative to sudden demand may be an additional manifestation of this pathology and represents something fundamentally distinct from the classic exertional apnea.