Chronic Fatigue Syndrome Treatments
It is useful to  Look at Intermittent Vascular Constriction During Intense Exercise to detect the cause of Chronic Fatigue Syndrome and to develop Treatment
Subtitle:
Intermittent Vascular Malfunction Between The Heart And Lungs As The Cause Of Long Term Covid And Chronic Fatigue 
The vascular structure between the heart and lungs shifts during intense exercise in people who have had a severe virus or even a regular virus.  The virus harms the vascular structure between the heart and lungs.  Testing of supine patients, or noninvasive stress tests, does not register any sign of damage to this area.  Invasive testing does.
NIH in the US has funded researchers to study long-term Covid causes and treatments.  The Researching COVID to Enhance Recovery (RECOVER) initiative, is funded for $1.15 billion over four years.  Treatment regimens for a range of long-lasting symptoms, including extreme fatigue, brain fog, and shortness of breath are sought.
NIH has focused on exercise, but more data is needed.  A fundamental benefit of exercise is that it generates oxygen for the organs and muscles.  Football players use supplemental oxygen to recover more quickly from a strenuous sprint during a game.  So also, athletes use supplemental oxygen to gain athletic advantage.
The combination of oxygen and exercise may provide key benefits to patients suffering from long term covid.  Be the first to benefit from new research spending by engaging WinterGreen Research as a lead consultant to marketing to explore market opportunities for your company, and to provide industry specific competitive analysis.