european college of sport science

PP-PH06 Physiology 6
Methods: Subjects voluntarily performed isometric knee extension with a knee angle of 90 deg at slightly above the recruitment threshold
force of the single MU for 60 s (control experiment). Two other situations were used to manipulate (reduce and gain) afferent input by
tendon vibration: (1) during the contraction after prolonged vibration (10min), and (2) during the contraction with vibration. The single MU
activities in the control experiment, in which there was no intervention, were compared under two experimental situations. Action potentials
of single MU were recorded in the vastus medialis muscle using non-invasive surface-array electrodes. Vibratory stimulation was
applied perpendicularly to the patella tendon with 75 and 100 Hz frequency and 0.5-0.8 mm displacement.
Results: In the first situation, the spike interval of MUs elongated gradually during contraction, but the amount of the elongation was less
than that in control experiment. In the second situation, the spike interval of MUs at the onset of constant-force contraction was significantly
longer than that in the control experiment and subsequently shortened to the same interval as that in the control experiment at 30
s, but it began to elongate thereafter.
Discussion: Irrespective of peripheral afferent manipulation, the elongating trend in the spike interval did not disappear during the constant-force
contraction. Results suggest that changes in neural input information to single MUs with peripheral afferent stimulation do not
eliminate the spike interval’s trend of elongation in the presence of voluntary drive.
References
Griffin et al. (2001) J.Physiol., 535, 929-936.
Kamo (2002) Eur. J. Appl. Physiol., 86,375-381.
Macefield et al., (1991) J.Physiol., 440, 497-512.
CHANGES OF REST METABOLIC RATE AND BODY FAT RELATED TO 8 WEEKS WHOLE BODY VIBRATION TRAINING OF
YOUNG FEMALE
KUEHNE, T., MISHCHENKO, V.
NEW LIFE BALANCE ACADEMY
New Life Balance GmbH, Roesrath, Germany1
Academy of Physical Education and Sport, Gdansk2
Recent study showed that intensity and duration of aerobic training should be gradually increased so that to maintain the effect of fat
oxidation activation in long term health-related physical training. There is a reason to consider strength and whole body vibration training
as one of the most perspective types of such training. However, its influence upon energy expenditures and activation of fat losses at rest
needs further investigations. The aim was to determine the effects of 8-weeks of mainly strength physical exercises in combination with
vibration impacts of inclined type upon rest metabolic rate and fatless body mass, girth of hips as well as cellulite manifestation in young
females.
Thirty seven young females aged 20-25 years (students) without any contra-indications took part in the studies. Subjects of experimental
group were used vibration platform (VP) LADIES-№1, whereas those of control group performed the same exercises using nonworking
VP. One medial-distal complete inclined vibration constituted 0..10 mm at frequency of up to 14 Hz. 24 training sessions (45-55
min) were performed in 8 weeks. Total duration of vibration load at one session constituted 8-12 min. The program of physical exercises
designated as ‘vibrobic’ was performed. The exercises preferentially stimulated leg and trunk muscles as well as those of back. After 4
and 8 weeks were measured: rest metabolic rate (VO2), RQ, BMI, fatless body mass (FBM), and girth of two hips.
The results showed that resting oxygen uptake in group of vibration training increased for 8 weeks - from 2,85 (0,15) up to 3,14 (0,13)
ml.kg-1.min-1 (p