How is it possible that setup men and relievers ever get faigued or worn out? They pitch like one or two innings at a time, and usually not on consecutive days. I heard the other day that for every inning that Joba Chamberlain pitches, he gets one day off. Are you kidding me? He gets two days off for 6 outs of work? How tired could a person be after 30 pitches, seriously? And you can't say it's because they're only conditioned for that much, because any kind of pitcher, at any level, trains like a mad man (keep your David Wells jokes to yourself). Just look at Roger Clemens' or Nolan Ryan's training regimens. And these middle relievers and closers are whining after 1 inning's worth of work? Jeez

The reason is that the pitches they throw are more important because it's later in the game and games are usually decided then. They put more effort into their 10-20 pitches than the other pitchers. Now once they start pitching 2 and 3 days in a row the arm gets tired. Remember that pitching overhand is unnatural for the human body. The reason for the "Joba rules" has nothing to do with resting him; it is because Joba has always been a starting pitcher in his career and has been groomed to be a starter. Next year he will be in the starting rotation. So it's to ensure that he doesn't experience arm problems by being a reliever for the time being. You say they whine after their 1 inning of work, well the best reliever will pitch over 80 games and it's not just the pitching, but also the warming up everyday that gets the arm tired. It is nowhere near as easy as it seems. Meanwhile starters will only pitch in 30-40 games each year assuming they don't miss starts. As a former pitcher in summer leagues I can tell you as a fact that it is much less strenuous to pitch a lot on one day than it is to pitch a little on multiple days especially consecutively.

That's why they're relievers (BTW, setup men ARE relievers) and not starters. Different people have different makeups. In addition, short men usually will throw mainly fastballs, which does tend to tire you out more, especially when thrown consecutively. Finally, while a short man can be used to throwing one inning per game (I agree, the "Joba Rules" are ridiculous), having someone who isn't used to it do more than that more than once in a while can throw off their rhythm.

If you've never done it, you wouldn't understand how tiring it is.

You also have to take into account the warm up pitches they throw in the bullpen before they pitch (usually between 15-20, and the warm up pitches on the mound when they come in (3-5 depending on the umpire.) Add that to the 20-30 during the inning and you're up to the 50 range.

Also, Clemens and Ryan were starters, they are conditioned completely different from relievers. They pace themselves more than relievers do. They get 4 days off between starts, while a reliever generally doesn't get more than 1 day off.
.

It's not that Joba will get tired. It's just the "Joba rules". Joba didn't make the rules. Brian Cashman did. They want to handle him with kid gloves since he's a young rookie.

the reason is simple there four type of pitcher and specific them all them starter, middle reliver,setup man, and closer. starter are talent enough to to pitch 7 innigs every 3 to four days. the rest are notonly for one two inng every game.rest or not.and when pitch every 3 days the do get tired. that why it like that