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Study: West teams at a disadvantage due to jet lag

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Every year, when the schedules are released, we often hear about the teams that have it worst. Almost always, those teams are West teams. According to MLB.com, teams in the West division of their respective leagues had the top eight most travel-heavy schedules in 2016. The full list:

Team League Division Miles
Mariners AL West 47,704
Angels AL West 44,945
Athletics AL West 42,119
Rangers AL West 41,128
Dodgers NL West 40,294
Giants NL West 39,341
Astros AL West 38,553
Padres NL West 37,363
Rays AL East 36,916
Red Sox AL East 36,896
D-Backs NL West 35,312
Yankees AL East 35,252
Marlins NL East 35,226
Rockies NL West 33,287
Blue Jays AL East 32,895
Orioles AL East 32,322
Braves NL East 29,236
Royals AL Central 29,077
Twins AL Central 28,948
Phillies NL East 28,351
Mets NL East 26,832
White Sox AL Central 26,538
Cardinals NL Central 26,451
Pirates NL Central 26,134
Brewers NL Central 25,620
Tigers AL Central 25,450
Indians AL Central 25,176
Reds NL Central 25,108
Nationals NL East 24,664
Cubs NL Central 24,271

The averages by division:

  • AL East: 34,856 miles
  • AL Central: 25,176
  • AL West: 42,890
  • NL East: 28,862
  • NL Central: 25,517
  • NL West: 37,119

The maps aren’t up for 2017 yet, but rest assured that West teams will once again have it worst. It’s easy to see why, taking a look at the map on MLB.com. If you draw a line to split Texas in half and go straight up through North Dakota, there are only eight teams to the left of that line, leaving the other 23 condensed on the right side. When West teams aren’t playing intra-division games, they are traveling. That’s often not the case for East and Central teams. The Phillies and Pirates, for example, don’t even have to leave the state to play each other.

As Gizmodo points out, a study published today in the Proceedings of the National Academy of Sciences found a link between jet lag and performance. Sleep scientist Ravi Allada of Northwestern University analyzed 4,919 games, finding that teams that traveled East performed worse than those that traveled West. Allada and his colleagues adjusted for home field advantage and park effects.

Specifically, teams that traveled from the West to the East lost more often than East teams traveling West. They gave up more runs and scored less runs. They hit for a lower batting average, on-base percentage, and slugging percentage. They gave up more home runs, accounting for most of the decline in run prevention.

There was a peculiar finding. Allada found that jet lagged home teams performed worse than jet lagged visiting teams. He hypothesizes that “teams may be more cognizant of their schedules when traveling away, thus mitigating jet lag effects,” he told Gizmodo.

Giants place Hunter Pence on 10-day disabled list with right thumb sprain

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The Giants placed outfielder Hunter Pence on the 10-day disabled list with a right thumb sprain, per an official announcement on Friday. Pence initially sustained the injury during the club’s home opener on April 3, when he dove to intercept a line drive double from Robinson Cano and jammed his thumb. Weeks of playing through the pain hasn’t worked, so he’ll take a breather while the Giants give outfielder Mac Williamson a chance to start in left after getting called up from Triple-A Fresno.

Pence, 35, wouldn’t pin his recent struggles on his injury, but it’s clear that he’s having difficulty finding his footing this year. He slashed a meager .172/.197/.190 through 61 plate appearances in 2018, collecting just one extra-base hit and two walks during the Giants’ dismal 7-11 stretch. While it’s far too early in the season to make any final judgments, it doesn’t look like the veteran outfielder will be replicating the .275+ average, 4.0+ fWAR totals of years past (at least, not anytime soon).

Williamson, meanwhile, has gotten off to a hot start in Triple-A. Prior to his call-up this weekend, the 27-year-old batted an incredible .487/.600/1.026 with six home runs and a 1.626 OPS through his first 50 PA. A hot Triple-A bat doesn’t always survive the transition to the majors, but the Giants will use all the help they can get — especially as they take on the AL West-leading Angels this weekend.