The Washington Post has an interesting article recently posted. They report on a study published at Proceedings of the National Academy of Sciences titled “How jet lag impairs Major League Baseball performance“. In their analysis of 20 years of baseball games, the authors of the study found that, due when suffering from acute jet lag
players performed worse on average, most notably base-runners and pitchers.
Teams suffering from jet lag gave up more runs, an average of an extra .197 runs at home and .162 away per game.
Pitchers, in particular, suffered from eastward travel. They tended to give up an additional .107 (at home) or .073 (away) home runs during each game.