ÜDS-Sağlık 2001-2 Soru=67

It is pointed out in the passage that it is ----.

Physical activity deserves attention in any
program to reduce coronary heart disease (CHD)
risk. Some evidence suggests that weight training
can raise high-density lipoprotein (HDL) if
undertaken regularly, but frequent and sustained
aerobic activity may be more effective in lowering
low-density lipoproteins (LDL) and raising HDL.
Furthermore, aerobic endurance-type activities,
such as brisk walking, undertaken faithfully for 30
minutes or more as a daily or every-other-day
routine can strengthen the heart and blood
vessels; alter body composition in favor of lean
over fat tissue; expand the volume of oxygen the
heart can deliver to the tissues at each beat and
so reduce the heart's workload; change the
hormonal climate in which the body does its work
in such a way as to lower blood pressure; and
bring about a redistribution of body water that
eases the transit of blood through the peripheral
arteries. These changes are so beneficial that
some experts believe that physical activity should
be the primary focus of cardiovascular disease
prevention efforts.