TABLE 2.

Training characteristics of the subjects.

	Group 1 Low (n = 10)	Group 2 Average (n = 10)	Group 3 High (n = 8)	Group 4 Weightlifters (n = 7)	Group 5 Runners (n = 8)
Physical education classes (quantity per week)	2	2	2	No	No
Training (quantity per week)	No	No	2	4–5	5–6
Average duration of one training session	2 h	2 h	2 h	2 h	2–3 h
Training intensity (percentage of maximum heart rate)	<60%	60–70%	60–80%	>80%	>80%
Average intensity of weekly motor activity (METS)	<3	3–4	4–6	>7	>7

METS was estimated by a medical doctor based on training characteristics.