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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →High carry totals have not been shown to cause worse next-season rushing performance or more injuries among NFL running backs. In one historical NFL cohort, backs with 300 or more carries actually had fewer observed missed games the following season than backs with 150–250 carries—but that association does not mean heavy workloads are protective. A separate study of Thursday games does not establish an RB-specific effect of rest. These findings describe selected historical groups, not a safe workload or rest prescription.
What NFL studies say about a high-carry season
A retrospective study examined ESPN statistics for NFL regular seasons from 2004 through 2014. It compared 275 running-back player-seasons: 212 with 150–250 carries and 63 with 300 or more. The researchers excluded backs with 251–299 carries to keep the groups distinct; some players appeared in the sample more than once. In the following season, the groups did not differ significantly in yards per carry (P=.24), and the study found no evidence that the high-carry group performed worse. Read the study.
Missed games are not proof that carries protect players
In that same cohort, 140 of 212 backs in the 150–250-carry group (66%) missed at least one game due to injury in the subsequent season, compared with 31 of 63 in the 300-plus group (49%; P=.016). The high-carry players also missed fewer games during the season being studied. These are observed proportions, not evidence that extra carries reduce injury risk. Players are not randomly assigned workloads: backs who are more durable or otherwise favored may be more likely to receive heavy workloads in the first place. The authors explicitly warn that potential confounding limits interpretation. See the study’s injury findings and conclusion.
Do college carries predict NFL outcomes?
A second study followed 103 running backs drafted in the first four rounds, whose final college seasons were from 1999 through 2012. It compared players with 100–200 carries in their final college season with those who had 250 or more, then assessed their first three eligible NFL seasons. The study found no clear relationship between final-season college carry volume and the outcomes it measured:
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| Outcome in the first three eligible NFL seasons | 100–200 final-season college carries | 250 or more final-season college carries | Reported comparison |
|---|---|---|---|
| Mean games missed due to injury | 5.8 | 5.7 | P=.98 |
| Yards per carry | 3.9 | 4.0 | P=.67 |
The authors concluded that, in this sample, college carries did not correlate with future injury risk or early NFL performance. The result applies to the selected group of early-round draft picks and its comparison categories; it does not establish what would happen to every college back or prove that workload never matters. Read the college-to-NFL study.
What the Thursday-game rest evidence can—and cannot—show
A study using official gamebooks from NFL Thursday games between 2013 and 2016 compared injury rates across rest categories. Its PubMed summary reports significant differences for tight ends, linebackers, and fullbacks, but does not report a significant running-back-specific difference. It therefore does not establish that a particular rest interval changes running-back injury risk. Nor can its findings be generalized to every interval, injury outcome, season, or player. See the PubMed summary.
Rank #2
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The available evidence does not establish a current RB-specific relationship between days between games and either performance or injury risk. Rest is only one part of the question; the cited findings do not show that it alone determines risk or that any specific schedule is safe.
How to read workload findings without overclaiming
- Separate outcomes. Injury occurrence, games missed, and yards per carry are different measures. A finding about one does not establish a finding about the others.
- Check the comparison. The NFL study compared 150–250 carries with 300 or more and looked at the following season. The college study used different carry bands and evaluated early NFL seasons in a narrowly selected draft cohort.
- Distinguish association from cause. Neither study randomized workloads. Differences between workload groups may reflect who receives carries, not an effect of the carries themselves.
- Do not infer a safe threshold. These studies do not identify a carry limit that prevents injury, establish that every carry imposes the same physical load, or provide an individualized medical recommendation.
- Keep the rest evidence position-specific. Findings for other positions in Thursday games do not establish an effect for running backs.
What NFL injury data can add
The NFL describes how it collects and analyzes injury data on its official injury-data page, which includes a February 4, 2025 interview with Dr. Mackenzie Herzog, identified as the league’s vice president for Player Performance and Innovation. That information helps explain the league’s data process; it is not an independent study showing that a workload or rest intervention works.
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