by kjmclark » Thu 24 Apr 2008, 15:39:04
$this->bbcode_second_pass_quote('zeke', 't')he exercise I've been doing is curls. most recently, what happened was that I had reached a level of doing 30 reps with 30 pounds, one arm at a time, and doing perhaps 2 or 3 sets of those. Then I stopped for a week or two. I resumed at the same amount of weight when my shoulder began to "complain." Maybe I built some muscle up more than others?
OK, here are some ideas. I do think the shoulder problem is rotator cuff. I have a similar problem with curls sometimes, but I usually do a combination curl/military press with dumbbells, and the shoulder problem comes in more when I get near the top of the curl and switch to the press, and then later when I get about 2/3 toward the top of the press. The rotator cuff is a set of muscles that underly the deltoids, shoulder blade, etc and stabilize your upper arm in the joint. There are lots of good exercises you can do to strengthen the rotator cuff, and most of them use dumbbells.
This sitehas some pretty good explanation.
Next, I would recommend that any time you take a week or two off, you plan to drop back to about 75% of where you left off. If it goes well, you can increase back to where you were pretty quickly, and you won't have lost much, if any, in the meantime. Jumping back into strength training where you left off can cause injuries, again, mostly because larger muscles overpower smaller ones. Your brain and muscles work together to decide what's a safe amount of exertion for all muscles and tendons involved, and taking more than a week off allows for the two to forget what was the last reasonable amount.
Finally, 30 reps is primarily building endurance, not strength. I learned it as 5-8 reps builds power, 8-12 is building strength, 12 and up is building endurance. Another way to look at it is that low reps with high weight trains fast-twitch muscle fibers and high reps with low weight trains slow-twitch muscle fibers. Fast-twitch fibers provide most explosive, anaerobic power, but slow-twitch fibers provide much higher endurance. Fast twitch/slow twitch ratios in a given muscle vary with the muscle group and your genetics, but in general I think biceps are mostly fast twitch.
Here'ssome discussion of muscle fiber types.
Anyway, at 30 reps you're pretty far into the endurance end of the spectrum. You should be able to lift small weights all day like that! If you want to lift more weight, however, you should consider moving to heavier weights and fewer reps. I have a similar build and usually stick to the 8-12 rep range for upper body lifting. I train my calves at 12-30 reps, and upper legs between 8 and 20 depending on the season and the weight I'm at. If you do choose to try higher weight, I would do some rotator cuff work for a few weeks first, however.
Don't expect to get cannonball biceps. You might have won the genetic lottery and just don't know it, but most of us mortals are better off accepting our limits and avoiding injury. And good for you for exercising at all!