Lelystad diagnostic test results

[Valentijn]

I finally got the written summary of my results from the CFS clinic in Lelystad (Netherlands).

CIS-20 (Checklist Individual Strength)
Fatigue: 47/56
Reduced Concentration: 18/35
Reduced Motivation: 12/28
Reduced Physical Activity: 18/21

SF36
Physical Functioning: 20/100
Role Physical: 0/100
Role Emotional: 100/100
Vitality: 20/100
Mental Health: 54/100
Social Function: 12.5/100
Bodily Pain: 70/100
General Health: 41.7/100

4-Dimensional Terluin Questionnaire
Distress: 2/32
Depression: 0/32
Anxiety: 0/24
Somatization: 12/32

Load Capacity Scan
Electrocardiogram: no abnormalities.
Heart Rate Variability: no abnormalities.
Moderate to sufficient functional reserve. Moderate pace of recovery. Incomplete recovery. Satisfactory adaptation to stress. Autonomic balance within the norm. Cardiac system is not ready for activities of high volume or intensity.
Spirometry: Normal. FEV1 3.79 l (120%). Lung Age 22 years.

I understand most of it after a lot of googling, but not "functional reserve", "recovery", or "incomplete recovery" in the Load Capacity Scan section. Presumably these are in a cardiac context? Could someone please help explain?