Re: The effects of eccentric versus concentric resistance training

[Guest guest]

Interesting developments, but the issue is still that in sport

training eccentric strength deficit is rarely a problem.

Rate of force production is - so resistive strength or isometric

strength will still have relatively modest application to sport, IMO.

Hence the reason 'quick' movements like cleans generally are more

specific and, I suspect, have more transfer than a heavy, slow deadlift.

Hobman

Saskatoon, Canada

> In recent personal conversation with Per Aagaard and Keijo Hakinnen, I

> was told that some very exciting new research on eccentrics was right

> around the corner from being published. Stay tuned...

>

> Cowell

> Crested Butte, CO

>

> Begin forwarded message:

>

> > From: JRTELLE@...

> > Date: November 16, 2008 4:34:56 PM MST

> > To: Supertraining

> > Subject: Re: The effects of eccentric versus

> > concentric resistance training

> > Reply-To: Supertraining

> >

> > In a message dated 11/16/08 12:46:17 PM, Carruthersjam@...

> writes:

> >

> > > Br J Sports Med. 2008 Nov 4. [Epub ahead of print] Links

> > >

> > > The aim of this systematic review was to determine if eccentric

> > > exercise is superior to concentric exercise in stimulating gains

> in

> > > muscle strength and mass. Meta-analyses were performed for

> > > comparisons between eccentric and concentric training as means to

> > > improve muscle strength and mass.

> > >

> >

> > Hi

> >

> > It is of extreme importance to realize this review contrasts

> > eccentric vs.

> > concentric. Studies, I'll have to find, indicate that con-eccentric

> > is better

> > for strength and hypertrophy than either con or ecc alone.

> >

> > My fascination is the question of whether concentric, which has a

> > hypertrophying effect without ecc, more efficiently stimulate the

> > slow -- slow fast

> > twitch fibers than eccentric. Studies suggest so. Also of great

> > fascination is that

> > apparently submaximal eccentric is also better than max concentric.

> > See below

> >

> > Greater initial adaptations to submaximal muscle lengthening than

> > maximal

> > shortening

> >

> > Tibor Hortobágyi, Barrier, Beard, Braspennincx,

> > Koens,

> > Devita, Line Dempsey, and Lambert

> >

> > Greater initial adaptations to

> > submaximal muscle lengthening than maximal shortening. J. Appl.

> > Physiol.

> > 81(4): 1677-1682, 1996.

> >

> > The purpose of this study was to compare the short-term

> > strength and neural adaptations to eccentric and concentric training

> > at equal

> > force levels.

> > Eccentric training improved eccentric and isometric strength more (P

> > < 0.05)

> > than did concentric training. The electromyographic adaptations were

> > greater

> > with eccentric training. Cross-education was 6%, and neither

> > training mode

> > modified fatigability. The data suggest that training of the

> > quadriceps muscle

> > with submaximal eccentric actions brings about greater strength

> > adaptations

> > faster than does training with maximal-level concentric actions in

> > women. This

> > greater adaptation is likely to be mediated by both mechanical and

> > neural factors.

> >

> > ------------

> >

> > Eccentric enhancement training is a new and exciting direction

> > especially

> > when one considers the vast number of eccentric protocols possible

> > -- only a few

> > of which have been rudimentarily explored. Hortobyagi and collegues

> > have done

> > a prodigous amount of excellent eccentric studies -- although most

> > with

> > isokinetic resistance. I believe much can be extrapolated from his

> > works for

> > inertial (actual weight) resistence exercise.

> >

> > Cheers,

> >

> > Jerry Telle

> > Lakewood CO USA

> >

> >

>

>