[Q]Person A and Person B

[FIRESTAR]

Person A and Person B are twins, both are male. Both have exactly the same genetic makeup - because they are twins. Both want to enter the world of bodybuilding, now; their diet(relevant to gaining mass) is exactly the same, their workout and volume is exactly the same there is only one difference - amount of reps.
Person A - 5-7 Reps
Person B - 10-12 Reps.

Both plan on working out for a year in EXACTLY the same fashion apart from the reps.

Now the question is what will be the end result:
A - Person A becomes stronger
B - Neither becomes stronger and both maintain the exact same levels.
C - Person B becomes stronger

What are your reasons for this, and where is the justification.

Personally I think Person A - but I will explain why later.

[Rogue_zero]

if they train together then person A. He gets more rest...

[Curt]

person A will get stronger.

i did this for a year and half...i trained to get big with reps 8,6 then 4 on everything....

this is why i am now naturally quite strong for my size.

[Gareth83]

Person A as it easier to progress on 5-7 reps.

ie, when you plateau on a weight for 10-12 reps it's hard to make any further adjustments

going from 7 reps at 100kg means you could probably go to 5 reps at 120kg.

if you see what I mean

[Bison]

I would think both would get bigger and stronger in different muscle groups, depending on what muscle fibre type is dominant.

A might get bigger chest, back and shoulders while B gets bigger legs and arms for example.

[FIRESTAR]

Why would doing 10-12 reps attest to building bigger legs and arms? I always assume with 5-7 reps that fast-twitch would be dominant, since you are outputting explosive power in a short space of time where endurance is not really required.

I would have thought doing 10-12 reps for the core, mainly because of its endurance during stability of the body, mainly because of heavy compound movements such as squats and dead lifts, 10-12 would be vital, or even 13-15.

[Curt]

is this set in stone then i take it? why?

[FIRESTAR]

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is this set in stone then i take it? why?

Reps are set in stone yeh. It just a simple scenario.

[Bison]

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Why would doing 10-12 reps attest to building bigger legs and arms? I always assume with 5-7 reps that fast-twitch would be dominant, since you are outputting explosive power in a short space of time where endurance is not really required.

Not just bigger, but all round stronger or more powerfull, better developed, whatever.

I don't believe that one rep range is the best for everyone for every muscle group

[Ripped Barbarian]

It depends on their genetics!!

One set of twins would respond differently as ratio of effectiveness to the 2 regimes that another set would.