- Buy Direct and Save Over 50% on Similar Specification Vibration Plates
- 28 Day Money Back Guarantee
- Interest Free Payments Available
- 3 Year Warranty
- Free 2 Man Delivery to UK and Ireland
- Free Training DVD
- For Home and Commercial use
- Expert Advice Available - Just Call Us
Abstract
Skeletal muscle is a specialised tissue, which modifies its overall function capacity in response to chronic exercise with high loads (e.g. Mc Donagh and Davies 1984). The adaptation to the training stimulus is related to the modification induced by the repetition of the daily exercise, which are specific for the movement executed (Edington and Edgerton , 1976). Strength training response has been shown to be mediated by both neurogenic and myogenic factors (e.g. Moritani and De Vries, 1979). Intensive prolonged strength training is known to induce a specific neuromuscular (e.g. Sale,
1988) and hormonal (e.g. Guezennec et al ,1986 ) adaptive responses in the human body in few months ,while the changes in the morphological structure occur later ( e.g. Sale,1988). However, the exact mechanism which regulate how the body adapts to the specific demands upon it , is still
unknown. In addition , even less knowledge are available in respect to fatigue, relative strength loss and hormonal changes during one acute session exercises ( e.g. Hakkinen and Pakarinen 1995). It should be remind, that strength and explosive power training specific programs are based
on exercises performed with rapid and violent variation of the gravitational acceleration (Bosco,1992). Gravity normally provides the major portion of the mechanical stimulus responsible for the development of the muscle structure during everyday life and during training. In this connection,
simulation of hypergravity (wearing vests with extra loads) conditions has been utilised for enhancement of human explosive muscle power (Bosco et al., 1984; Bosco 1985). On the other hand, changes of the gravitational conditions can be produced also by mechanical vibrations applied to the whole body. In light of the above observations, it can be assumed that application of whole body vibration and/or locally applied vibrations to physical active subjects could influence the
mechanical behaviour of lower and upper limbs' muscles. Vibrations have been extensively studied in occupational medicine and ergonomics. It means that they represent some sort of stimulus to which all of us undergo in daily activities. Literature on vibration is mostly related to the study of
vibrations as a diagnostic tool and on their effect on chronical exposure. In fact, most of the work has been carried out in occupational medicine and ergonomics and in animal experiments to be able to understand what is the effect of vibrations on human body. However, even if there is a
respectable amount of scientific work on the topic, it is difficult to come to a consensus since
different devices have been used and different vibration treatments have been utilised (changing
frequency, acceleration and displacement). Moreover, the application of vibrations as an exercise
tool is a rather new topic in literature (i.e. Issurin 1994, Issurin et al., 1999). Based upon the literature findings it is possible to affirm that vibrations provide a strong stimulus for the neuromuscular system, the bone and the muscle tissue itself.
Method
The followings jumping tests were performed: counter movement jump (CMJ) and 5s of continuous jumping (5s CJ).The flight time (tf) and contact time (tc) of each single jump were recorded on a resistive (capacitative) platform (Bosco et al., 1983) connected to a digital timer
(accuracy ± 0.001s) (Ergojump, Psion XP, MA.GI.CA.Rome, Italy). To avoid un-measurable work, horizontal and lateral displacements were minimised, and the hands were kept on the hips through the test. During CMJ the knee angular displacement was standardised that the subjects were
required to bend their knee approximately 90°. The rise of the centre of gravity above the ground (h in meters) were measured from flight time (tf in seconds) applying ballistic laws:
Hormonal Measurenet
. The first blood samples were drawn at 08:00 a.m from an antecubital vein after 12 hours fasting and 1 days resting. The second blood sample was obtained right after the
end of the vibration treatment. The subjects were asked to sit near to the vibration machine, where an appropriate setup was prepared for blood collection. The blood samples were drawn in the 1-min following the end of the vibration treatment. Serum samples to be used for hormone determinations were kept frozen at -20°C until assayed. The assay for serum total T and cortisol ( C) were performed by radioimmunoassay (RIA) using reagent kits (Diagnostic Products Corporation, Los Angeles California, USA). Growth hormone was measured using RIA reagent kits obtained from
radium (Pomezia, Italy). All samples from the tested subjects were analysed using RIA counte. The intra-assay coefficients of variations for duplicate samples were 3.63% for T, 5.1% for C and 2.1% for GH. Blood lactate measurement.
Peak lactate concentration was determined from the subject's ear lobe blood samples before test-1, and 3-5-7 min after 30r-N and 30r-V. The tests were de-proitenezed in
ice -cold percloric acid for subsequent analysis of lactic acid.
Testimonials
