Originally posted by: bossman34
A 5x5 routine typically requires you to use 85-90% of your 1 rep max which is a lot for somebody who is new to resistance training.
Depending on the formula, a set that is truly a 5RM is going to be
between 85-87% of your 1RM, but for beginners, this is inaccurate for two reasons:
1. If you are doing 5 sets of 5 reps, it's unlikely that you'll do all 5 sets with your actual 5RM, especially early on. To be able to get through all 5 sets, you'll typically have to use a weight that's a little lighter, or you'll fatigue too much by the time you get to the last few sets.
2. Most beginners are limited not just by strength, but technique too. This forces them to use still less weight than what their absolute strength would let them.
Originally posted by: bossman34
Ok, so it doesn't automatically mean that you will be injured, but it definitely increases your chances.
Do you have any proof of this?
Originally posted by: bossman34
And who says that 5x5 routines are so frequently recommended for newbies?
Most routines I've seen that are designed to increase
strength - including SS, SL 5x5, and most o-lifting routines - are built around sets of low reps (~5). The only (good) routines I've seen recommending high reps are bodybuilding style routines which are focused on
hyperotrophy. It probably is true that higher reps lead to more muscle mass, but this has nothing to do with the routine being safer. And even bodybuilding routines tend to include a lot of low rep training, especially for the big compound moves (for example, Max OT).
Originally posted by: bossman34
Read any accredited resistance training, personal training, or sports training book from ACSM, NSCA, and even NASM and you'll understand what I am talking about.
If you have links, I'll be happy to take a look. However, I tend to trust people who's entire livelihood revolves around training strong athletes. Just about every single endeavor where strength is the goal uses low reps and I've seen no evidence that the rate of injury is any higher.
Originally posted by: bossman34
Muscle fatigue can set it at 5 reps just as easy as it can 12 reps so that argument doesn't work.
There are many differences between low rep training and high rep training. For example, roughly speaking, the predominant energy system in low rep training is phosphagen, while high rep training - with sets lasting over ~15 seconds - is closer to being predominantely glycolytic. This will make a big difference in the "fatigue" you get from a lift. In my personal experience, because higher rep sets last so much longer, it's tough to force your muscles to keep proper form for the greater duration of time.
Originally posted by: bossman34
A 5x5 routine is great for building strength, but before you jump to that you need to make sure that your neuromuscular, muscles, and connective tissue are ready for it. To build strength, you need muscle and the connective tissue to support it. To build muscle, reps in the 6-12 range are recommended.
I disagree that more muscle mass - as you might get from doing more reps - is going to prepare you for heavier loads better than... working with heavier loads. Your body adapts specifically and exactly to the stimulus you present it with, so doing high rep training will only adapt your body to high rep training. If you want to prepare your muscles and connective tissues for heavy loads, then you have to use heavy loads. However, you don't just jump into it: you build it up gradually, as required by all good routines.
Originally posted by: bossman34
I'm sorry if I made the whole injury comment seem so cut and dry because it isn't, but I would hardly say it's ignorant. Rippetoe is a very knowledgeable guy and has been around for awhile, but I think that some of his ideas are a little old school and aren't necessarily the best way to go. Just because it has worked for him and others doesn't mean it is the only way just like the 2-3 sets of 12 isn't the only way.
I definitely agree that 5x5 isn't the only way. The number of sets/reps you do should be aligned with your goals. Roughly speaking:
* If your goal is strength, use lower reps (~4-6) and heavier weight
* If your goal is muscle size (hypertrophy), use medium reps (~8-12) and medium weights
* If your goal is muscular endurance, use high reps (15+) and low weights
* If your goal is general physical preparedness, constantly vary the number of reps in your workouts (ala Crossfit)
However, I'd say that whichever choice you pick, as long as you work your way up gradually and use proper form, the risk of injury is roughly equal.