Your browser doesn't support javascript.
loading
Effects of Bicycle Ergometer Exercise on Cerebral Blood Flow Velocity and Electroencephalogram Response in Normoxia and Hypoxia
Korean Journal of Health Promotion ; : 59-67, 2019.
Article in Korean | WPRIM | ID: wpr-740980
ABSTRACT

BACKGROUND:

The cerebral blood flow velocity (CBFV) has been known to increase in response to acute hypoxia. However, how CBFV might respond to exercise in hypoxic conditions and be associated with electroencephalogram (EEG) remains unclear. The purpose of this study was to evaluate the effect of exercise in hypoxic conditions corresponding to altitudes of 4,000 m on CBFV and EEG.

METHODS:

In a randomized, double-blind, balanced crossover study, ten healthy volunteers (19.8±0.4 years) were asked to perform the incremental bicycle ergometer exercise twice in hypoxic and control (sea level) conditions with a 1-week interval, respectively. Exercise intensity was set initially at 50 W and increased by 25 W every 2 minutes to 125 W. Acute normobaric hypoxic condition was maintained for 45 minutes using low oxygen gas mixture. CBFV in the middle cerebral artery (MCA) and EEG were measured at rest 5 minutes, rest 15 minutes, immediately after exercise, and 15 minutes recovery using transcranial-Doppler sonography and EEG signal was recorded from 6 scalp sites leading to analysis of alpha and beta wave relative activities. All data were analyzed using two-way repeated-measures analysis of variance and Pearson's correlation.

RESULTS:

CBFV in the MCA in the hypoxic condition was significantly higher than that in the control condition at rest 5 minutes (83±9 vs. 69±9 cm/s, P<0.01), rest 15 minutes (87±8 vs. 67±7 cm/s, P<0.001), immediately after exercise (112±9 vs. 97±9 cm/s, P<0.01), and 15 minutes recovery (91±11 vs. 74±7 cm/s, P<0.01). However, no significant correlation was found between the changes of CBFV and EEG wave activities.

CONCLUSIONS:

These results suggest that the drastic change of CBFV observed during exercise with hypoxia might appear independently with EEG wave activities.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Oxygen / Scalp / Cerebrovascular Circulation / Cross-Over Studies / Middle Cerebral Artery / Electroencephalography / Altitude / Healthy Volunteers / Hypoxia Type of study: Controlled clinical trial Language: Korean Journal: Korean Journal of Health Promotion Year: 2019 Type: Article

Similar

MEDLINE

...
LILACS

LIS

Full text: Available Index: WPRIM (Western Pacific) Main subject: Oxygen / Scalp / Cerebrovascular Circulation / Cross-Over Studies / Middle Cerebral Artery / Electroencephalography / Altitude / Healthy Volunteers / Hypoxia Type of study: Controlled clinical trial Language: Korean Journal: Korean Journal of Health Promotion Year: 2019 Type: Article