european college of sport science

Thursday, June 25th, 2009
differ significantly (P>0,95), showing an increase in the fluctuations with fatigue. This significant change also depends on the sportsmen
level and experience.
Discussion: New features of fatigue have been revealed as the tendency to present altered values of inter-parameter relationships in
post-training monitoring. These results are in agreement with the finding that the process of fatigue is related to the interaction between
functional systems (Nybo, 2008). Summing-up the evaluation of the interconnection between ECG parameters representing different
fractal levels allows the detection of fatigue features.
References
Nybo L. (2008). Hyperthermia and fatigue. Journal of Applied Physiology, 104, 871-878.
Vainoras A., Gargasas L., Ruseckas R. et al..Computerized exercise electrocardiogram analysis system “Kaunas-Load”. (1997) In “Electrocardiology’97”
Bratislava, Slovak R., 253-256.
Vainoras A., Navickas Z., Poderys J., Berskiene K., Bikulciene L. (2008). ECG signal for assessment of interpersonal or inter parameter
influences. // the 2nd International Scientific Conference “Current issues and new ideas in sport science”. [Electronic resource], Kaunas.
14:15 - 15:15
Poster presentations
PP-AP01 Adapted Physical Activity 1
VIBRATION EXERCISE: AN EFFECTIVE COUNTERMEASURE FOR VASCULAR ADAPTATIONS TO BED REST
VAN DUIJNHOVEN, N., THIJSSEN, D., GREEN, D., FELSENBERG, D., BELAVÝ, D., HOPMAN, M.
DEPARTMENT OF PHYSIOLOGY, RADBOUD UNIVERSITY NIJMEGEN MEDICAL CENTRE, NIJMEGEN, THE NETHERLANDS
Introduction: Physical deconditioning is an important independent risk factor for atherosclerosis and cardiovascular disease. While bed
rest results in marked vascular changes, exercise has shown to be an effective countermeasure for these adaptations (Bleeker et al,
2005). However, little is known about the most optimal exercise type to prevent the vascular changes to bed rest. Therefore, the purpose
of this study was to examine the effect of two different types of exercise, i.e. resistive exercise and resistive vibration exercise, to counteract
the vascular adaptations to bed rest.
Methods: Eighteen healthy men (31±8 years) were randomly assigned to bed rest (control; C), bed rest with resistive exercise (RE), or bed
rest with resistive vibration exercise (RVE). Exercise was applied three times a week for 5-7 min per session. Before and after 60 days of
bed rest, resting diameter and blood flow, flow-mediated dilation (FMD; a measure of endothelial function), and maximal diameter of the
superficial femoral artery (SFA) were measured using echo Doppler ultrasound.
Results: After 60 days of bed rest, resting diameter of the SFA was significantly decreased in C and RE (Wilcoxon: P=0.02 and 0.04, respectively),
but not after RVE. No changes in resting and hyperaemic blood flow were found after bed rest in all groups. While FMD increased
in C and RE (P=0.02 and 0.04, respectively) after bed rest, FMD did not change in the RVE-group. C and RE showed a decrease in
maximal SFA diameter (P=0.02 and 0.04, respectively), while maximal SFA diameter was preserved in the RVE-group. Using ANCOVAs,
we identified significant group effects for resting diameter and FMD (P=0.02 and 0.003, respectively), but not for maximal diameter.
Discussion: 60 Days of bed rest deconditioning is accompanied by a decrease in resting and maximal diameter of the SFA, and an
increase in FMD. The stimulus provided by resistive exercise was insufficient to counteract the vascular adaptations to bed rest. However,
adding a vibration component to the resistive exercise, significantly attenuated or even preserved the changes in superficial femoral
artery diameter and endothelial function to bed rest. In conclusion, only three, ~6-min resistive vibration exercise bouts per week during
bed rest is suitable to counteract the detrimental vascular adaptations to bed rest.
References
Bleeker M, De Groot P, Rongen G, Rittweger J, Felsenberg D, Smits P, Hopman M. (2005). J Appl Physiol 99(4), 1293-300.
THE EFFECTS OF REGULAR EXERCISE ON THE CARDIAC AUTONOMIC NERVOUS ACTIVITY IN RECOVERY PHASE AFTER
ANAEROBIC INTERVAL EXERCISE
ONO, K., OGAWA, M., KITAGAKI, K.
KOBE UNIVERSITY
Introduction: It has been suggested that the collapse of the autonomic nervous system is related to sudden death. It has become clear
that high activity of the parasympathetic nervous system causes a decline in the death rate. The purpose of this study was to determine
the effects of regular exercise on cardiac autonomic nervous activity in the recovery phase after anaerobic interval exercise.
Method: Twenty four healthy young people (11 males: age: 20.3±0.67years; Mean ± S.D., height: 169.67±3.59cm, body weight:
59.89±3.53kg, % body fat: 16.46±1.92% and 13 females: 20.7±5.37years, 159.9±40.46cm, 52.63±14.36kg and 25.97±7.92%: T-group)
and 26 young people (12 males: 21.6±1.06years, 173.0±4.67cm, 62.1±6.22kg and 18.1±3.18% and 14 females: 21.6±0.87 years,
157.0±4.21cm, 48.0±4.69kg and 27.0±3.69%: S-group) participated in this study, voluntary. The subjects ran up 23 steps with theirs best,
and they had interval for 20 seconds. They repeated up to 80% HR reserve. After exercise, they had recovered for 30 minutes by supine
position. The measurements were Augmentation index (AI) and central systolic blood pressure (c-SBP) on rest, heart rate (HR) and cardiac
autonomic nervous activity (low frequency: LF and high frequency: HF) on rest and after exercise (immediately, 5, 10, 15 and 30min.),
respectively. The temperature and humidity were 25.3±0.98ºC and 47.3±4.11% during measuring, and they were 19.3±0.25ºC and
45.6±1.69% during exercise.
Results: The T-group’s AI on rest was 64.9±14.0, and the S-group’s was 55.7±9.10. The T-group’s c-SBP on rest was 112.17±9.99mmHg,
and the S-group’s was 104.7±10.26mmHg. The T-group’s HR on rest was 57.1±6.85bpm, and S-group’s was 68.7±11.31bpm. The Tgroup’s
log HF on rest was 3.33±0.49, and S-group’s was 3.05±0.36. The results revealed that the T-group’s HR on rest led to a significant
reduction and AI, c-SBP and log HF led to a significant high value compared with on S-group’s (P