Article

Previous studies examining the relationship between exercise dose and
post-exercise hypotension (PEH) have employed a limited range of exercise
duration and subject age. We extended the dose-response curve by studying two
intensities of prolonged exercise that may produce a greater magnitude of PEH and
reveal age differences in the exercise dose-response relationship for PEH.
METHODS: Two groups of healthy recreational endurance athletes were studied:
Young (n = 17; age 28 +/- 1.1 years) and middle-aged participants (n = 18; 52 +/-
0.90 years). They performed on separate occasions, 120 min of prolonged exercise
(running) at moderate (60% VO2max) and high intensities (80% VO2max). RESULTS:
PEH after 1 hour of recovery was similar within each age group for either
exercise intensity, but was significantly greater in the middle-aged group
(moderate intensity, -12.3 +/- 1.6 mmHg; high intensity, -15.1 +/- 1.7 mmHg)
compared with the young group (moderate intensity, -1.2 +/- 1.7 mmHg; high
intensity, -5.7 +/- 2.5 mmHg; p < 0.05). Stepwise regression showed that baseline
blood pressure but not age was significantly related to the degree of PEH. Thus,
the greater PEH seen in the middle-aged group is attributed to their higher
baseline blood pressure (124 +/- 3.0/79 +/- 2.0 mmHg) than the young group (111
+/- 2.0/69 +/- 1.8 mmHg). A reduced total peripheral resistance following
exercise was the primary contributor to PEH across both age groups and exercise
intensities. CONCLUSIONS: We conclude that prolonged exercise induces a
significant PEH regardless of exercise intensity.

Langue : ANGLAIS