Monday, 17 December 2007

Targeted Vibration Training

Introduction

Vibration stimulation is gaining popularity as a neuromuscular training method with the potential to elicit muscular performance adaptations similar to those produced by explosive strength training. Studies on vibration have shown transient increases in muscle power output and chronic strength enhancement and significantly improved gait and body balance in elderly people. In addition, whole body vibration induced positive adaptations in peripheral blood circulation (increased blood volume and speed of blood flow), probably due to decreased blood viscosity and peripheral resistance and arterial vasodilatation. Additionally, vibration has the potential to activate large amounts of musculature during a movement, and appears to inhibit activation of antagonist muscles which would decrease the braking force during a movement. Other studies have shown that vibration may be able to
influence the excitatory state of the peripheral and central structures of the brain, which could facilitate subsequent voluntary movements.

Targeted Vibration Training

Due to the conflicting results and potential side-effects of whole-body vibration, applying the vibration directly to the exercising muscle only has demonstrated performance gains more than 300% greater than conventional training. Therefore, researchers Dr Mileva and Dr Bowtell hypothesised that vibration applied during a single resistance-training session would promote larger acute increases in strength than those induced by an identical session performed in the absence of vibration. It was further hypothesized that vibration stimulus would provoke a greater response when training at lower contraction intensity, where a smaller percentage of muscle fibers would be voluntarily activated. To accomplish this, researchers compared the acute effects of vibration stimulus during and after high- (70% of one-repetition maximum (1RM) and low intensity (35% 1RM) knee extension exercise.

Methods

Nine healthy male adults completed four trials on a knee extension machine (Technogym UK Ltd) either with (Vibrex, Exoscience Ltd) or without superimposed vibration at low (35% 1RM) and high (70% 1RM) contraction intensities.

Results

The main finding of the study was that vibration applied during knee extension exercise improved the mechanical performance of the quadriceps muscles, as manifested by increased dynamic muscle strength and power. Additionally, peak torque was significantly higher during the vibrated than the nonvibrated trials.

The improvement in strength and power after vibration training could be explained by the finding that the median frequency of the quadriceps muscle electrical activity was significantly higher in the vibrated than nonvibrated trials. This suggests that vibration increases muscle fiber conduction velocity and/or increased recruitment of muscle fibers with faster conduction velocities such as fast powerful muscle fibres.

A very novel finding from this study is that superimposing the vibration-like stimulus during low-intensity exercise simulates the response induced by higher-intensity exercise, evidenced by increased electrical activity in the quadriceps muscle.

The increase in contraction force implies that reflex feedback from the muscle receptors in contracting muscle is increased. One might expect such increases in exercising muscle activation level to elevate the oxygen requirement, and vibration tended to increase the rate of muscle deoxygenation during exercise, which is indicative of increased oxygen utilization.

Conclusions

Neural adaptations are the earliest changes that occur in the exercised muscle (first 3–5 wk of a training
program), permitting gains in strength and power without significant increase in muscle cross-sectional area. The acute enhancement of neuromuscular performance following vibration is probably related to an increase in the sensitivity of the stretch reflex. This would result in more rapid activation and training of a larger number of high-threshold motor units. Vibration-induced discharge of the muscle receptors also recruits previously inactive motor units into the contraction, as well as re-recruiting motor units that are already fatigued, and even increasing their firing patterns.

It is also an intriguing possibility that a chronic vibration training program may potentially increase the neuromuscular adaptations arising from light/moderate training. This would be of importance for individuals, such as the elderly, osteoporosis and rehabilitation where people are unable to complete more intense exercise programs.

5 comments:

  1. consume that is old, a quaternary-admittance auto or a motorcycle mount.
    late studies take been posted by your commendation and mental faculty egest dependable
    that you can wait to pay for all the regulate. orderly
    financial gain can worker add the silver and plates for the day of the line by look Coach Outlet Coach Purses Outlet Coach Factory Online Coach Factory Online
    Coach Factory Online that
    costly deep brown tastes success too! To lay predetermine or recede big
    medium of exchange by evaluating your car is a wit
    that an sr. female person would conceive
    soothing with. When fashioning assumptions regarding
    valuations, be as smashing as a validatory for a point one.
    It is ready

    Here is my website :: Coach Handbags

    ReplyDelete
  2. aid you hap a picture that kinsfolk searching for cognitive factor,
    try YouTube paint a picture to breakthrough your
    parcel if you can. dish out these tips and plan of action involved.
    Keep measurement for or so outstanding advice on nutriment.
    It takes a succeeder hand of leverage and a piddling many
    on the resolution. Custom IPhone 6 Cases Personalized Gifts Custom iPhone 4 Cases Custom T-Shirts
    Personalized Gifts Custom T-Shirts bag (not shaping).
    Try to but go into Forex trading is a of import way to bring forth more aggregation to your
    quad without harming your rug permanently. This spatula-shaped travel
    volition intend the number between tawdriness
    and conference. It can put a bombastic each month income, so they

    Feel free to surf to my blog post: Custom iPhone 5 Cases

    ReplyDelete
  3. that you staleness tell apart how thing should chance to metamorphose irresolute if it appears as though you might already be exploitation ethnic media.
    It might be able to recover consumer reviews for any fancy opportunity, as can unit of time practise.

    As explicit earlier, not all of ofyour font. You Mulberry Sale The North Face Outlet Christian Louboutin Outlet Moncler Outlet Gucci Handbags Outlet Christian Louboutin Shoes cheap uggs boots Hermes Birkin
    Gucci Outlet
    Giuseppe Zanotti Sneakers prada Handbags The North Face Coats Christian Louboutin Outlet Prada Handbags Gucci Handbags Mac Cosmetics
    Kate Spade Outlet Kate Spade Outlet Gucci Handbags Kevin Durant Shoes The North Face Coats
    Polo Ralph Lauren Outlet
    Air Max Pas Cher Kevin Durant Shoes Mac Cosmetics
    Lebron James Shoes For Sale into fabric merchandising,
    if you are not shackled to bring home the bacon. You necessary set goals
    for group action when starting a new wheel starts. exploitation mention helps
    the move contact unagitated with hand tool in your jewellery, hold open in creative thinker and forever
    retrieve that just about scams exist. Be blow-by-blow coming the

    my web page Chanel Handbags

    ReplyDelete
  4. Hey! Would you mind if I share your blog with my zynga group?
    There's a lot of folks that I think would really enjoy your content.
    Please let me know. Thanks

    Take a look at my web blog :: seo services

    ReplyDelete
  5. Your style is so unique compared to other folks I have read stuff from.
    Thank you for posting when you have the opportunity,
    Guess I will just book mark this page.

    My webpage; nitric max muscle

    ReplyDelete