european college of sport science

Thursday, June 25th, 2009
ous after exercise via the increased venous return during 0-5 min. recovery process. However, during 6-10 and 11-15 recovery period,
there was no significant difference of log HF between the SELL condition and the Control condition. In high intensity exercise, there was no
significant difference of log HF between the SELL condition and the Control condition. These data suggest increased cardiac parasympathetic
nerve with high- intensity exercise may be improved early by elevated lower limb at supine position after high-intensity exercise. In
conclusion, supine position with lower limb elevated after exercise may enhance the cardiac parasympathetic reactivation during recovery.
Reference: Kazuki Nishimura, Kazutoshi Seki, Kumiko Ono and Sho Onodera (2006); Effects of the Supine Floating on Rectal Temperature
and Cardiac Parasympathetic Nervous System Activity after Exercise with a Cycle Ergometer. Japanese Journal of Aerospace and Environmental
Medicine, 43(1), 11-18.
DYNAMICS OF OXYGEN CONSUMPTION AND WORKING MUSCLE OXYGENATION DURING EXERCISE WITH DIFFERENT
LOAD PROFILES
POPOV, D., MARCHENKO, D., KUZNECOV, S., BOROVIK, A., VINOGRADOVA, O.
SSC RF INSTITUTE FOR BIOMEDICAL PROBLEMS
Cardio-respiratory indices respond to an abrupt increase of load with considerable time delays. These delays differ from one index to
another. The goal of the study was to compare responses of cardio-respiratory system and oxygen consumption in working muscle
during exercises with different load profiles.
7 endurance trained athletes gave their informed consent to participate in the experiment. VO2max and anaerobic threshold at blood
lactate level 4 mmol/l (AT) were determined during ramp test on a cycling ergometer at the first day of an experiment. The next days the
subjects performed two tests in random order. During the first test after 8 min warming up at 40% AT the load was abruptly increased up
to 110% AT and then was gradually decreased during 4 min to the basic level of 40% AT. A reverse profile was used in a second test:
gradual increase of load for the 4 min and then abrupt decrease to the initial level. Peak load and total mechanical work were the equal
for both tests. oxygen consumption, HR, EMG activity of m. vastus lateralis, muscle oxygenation index (MOI) and deoxygenated hemoglobin
(HHb) content in m. vastus lateralis were recorded continuously during the tests. Blood lactate concentration was measured every 30
s. In addition the subjective perception of exertion was evaluated for each exercise load.
EMG activity did not differ between loads with different power profiles. Total oxygen consumption and total number of heart beats during
exercise and 2 min recovery period did not differ either. Peak values of oxygen consumption, HR, MOI and HHb were significantly
(p