[quote]fama wrote:
[quote]BHOLL wrote:
your not making much sense, firstly the subscapularis has the highest percentage of fast twitch fibers which is in accordance with why pitchers can throw a baseball hard. The supraspinatus has the highest percentage of slow twitch fibers and is the muscle heavily involved in stabilization while overhead pressing.[/quote]
You’re correct - I meant to say supraspinatus (not subscap), as the supraspinatus is the one (the only one) that’s more than 1/2 ST, at the specified 54%.
[quote]BHOLL wrote:
Furthermore, you are correct, the elderly age does make a difference, BUT this only further suggests that these numbers favor fast twitch %'s as a decrease in activity actually increases the % of fast twitch fibers. hence the older population in this study most likely skewed the numbers in favor of FT fibers. The more training your perform the more % type 1 and type IIa are biased. Hence why bodybuilders are heavily type 1/type IIa.[/quote]
Let me see if I have this right: you’re saying that FT fibers – the stronger, larger fibers – actually increase as one ages, or as one becomes more “detrained” ???
Uhh…sorry, I just don’t believe that at all. And I believe that if bodybuilders have more Type I and IIa fibers than, say, powerlifters have of Type IIb, it’s because of the METHODS bodybuilders use: traditionally with longer TUT, often with slower lifting tempos, etc.
[quote]BHOLL wrote:
do you think holding a bar over your head is much more challenging then 8-10 reps of a reasonable weight?[/quote]
Yes.
Sure, I don’t think anyone really disputes that - it’s just that (as CT himself has said in the Livespills quoted above) the usefulness of such exercises is limited, and it’s not the only way these muscle should trained.
[/quote]
I know this is comprehensive stuff, but try and understand. We are talking percentages, not fiber thickness. Define stronger? strength-endurance, maximal strength, explosive strength. Type IIx generally produce 10x greater peak power then type 1. I guess you didnt take my advice and read T-nations very own Jacob Wilsons paper published in NSCA 2012. Let me quote it for you:“research indicates that a lack of exercise may facilitate changes between slow and fast twitch fibers. For example Hortobagyi et al investigated the effects of 3 weeks of knee immobilization. Knee immobilization reduced type 1 fiber percentages by 9% and increased type II X 12%.”
As for the second part,isn’t that what we’ve been talking about, fiber shifting, duh, bodybuilders spend generally little rest and lots of time under tension shifting fiber type to I and IIA.
Part 3, regardless of what you think is more challenging, the fact of the matter is an isometric hold will accomplish much less as far as translating to other movements as well as generating hypertrophy and does not stress the RTC eccentrically which it is often injured. Therefore, if chosing and isometric vs. conc/ecc exercise the latter is often preferred as it has greater training effect as well as carry over