Author Topic: The bilateral deficit  (Read 2664 times)

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Raptor

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The bilateral deficit
« on: September 24, 2012, 04:46:20 pm »
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http://www.strengthandconditioningresearch.com/2012/09/11/bilateral-deficit/

I found this very interesting:

Quote

Basically saying that you need to really be rested (have close to 100% "battery" or CNS) if you really want to perform off one leg, whereas bilateral stuff requires less peak intensity but more overall CNS burn.

Even more, since we're trying to improve the neural drive and "explosiveness" during our plyo workouts, it should make more sense to use unilateral plyometric exercises since the most neural drive occurs during these movements.

Anyway,

Quote
What did the researchers conclude?

The researchers concluded that the ground reactions force produced by each leg during the two-legged jump were less than that produced during the one-leg jump. This was caused by lower joint moments.

The researchers concluded that while it is possible that the lower joint moments in the two-leg jump were smaller than those in the one-leg jump because of reduced neural drive, peak EMG levels in the two-leg jump were only slightly lower than those in the one-legged jump. They therefore suggest that a reduction in neural drive is unlikely to be the cause of the reduced moments.

Rather, the researchers suggest that because some of the muscles must have shortened at higher velocities in the two-legged jump, this caused them to produce lower forces because of the force-velocity relationship. They note that this was the result produced by their computer simulation, as enforcing the same muscle-shortening velocities in both jump variations eliminated 75% of the difference in jump height.

Quote
« Last Edit: September 24, 2012, 05:21:16 pm by Raptor »

adarqui

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Re: The bilateral deficit
« Reply #1 on: September 24, 2012, 10:32:55 pm »
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http://www.strengthandconditioningresearch.com/2012/09/11/bilateral-deficit/

I found this very interesting:

Quote

Basically saying that you need to really be rested (have close to 100% "battery" or CNS) if you really want to perform off one leg, whereas bilateral stuff requires less peak intensity but more overall CNS burn.

Even more, since we're trying to improve the neural drive and "explosiveness" during our plyo workouts, it should make more sense to use unilateral plyometric exercises since the most neural drive occurs during these movements.

Anyway,

Quote
What did the researchers conclude?

The researchers concluded that the ground reactions force produced by each leg during the two-legged jump were less than that produced during the one-leg jump. This was caused by lower joint moments.

The researchers concluded that while it is possible that the lower joint moments in the two-leg jump were smaller than those in the one-leg jump because of reduced neural drive, peak EMG levels in the two-leg jump were only slightly lower than those in the one-legged jump. They therefore suggest that a reduction in neural drive is unlikely to be the cause of the reduced moments.

Rather, the researchers suggest that because some of the muscles must have shortened at higher velocities in the two-legged jump, this caused them to produce lower forces because of the force-velocity relationship. They note that this was the result produced by their computer simulation, as enforcing the same muscle-shortening velocities in both jump variations eliminated 75% of the difference in jump height.

Quote

Regarding plyos:

I would imagine, from experience and observation, that single leg plyos (max effort consecutive leg bounds) yields greater permanent improvements in strength + hypertrophy than double leg bounds/depth jumps.

Regarding double leg bounds / MR tucks, I think I should have focused more on forcing myself to land lower, closer to half squat.. I spent too much time at the shorter range of movement, even though I really felt forcing depth on those was pretty beneficial.

Raptor

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Re: The bilateral deficit
« Reply #2 on: September 25, 2012, 05:55:05 am »
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« Last Edit: September 25, 2012, 05:58:27 am by Raptor »