NFL Sports editorial source review ·
Ja'Marr Chase: 40 yard time and speed evidence
The reviewed record lists 4.38 seconds. Source setting: LSU pro day. Read the event notes before comparing that mark with another workout.
Where the time comes from
LSU publishes a 4.38 second sprint, a 41 inch vertical, an 11 foot broad jump, a 7.00 second cone and a 3.98 second shuttle for its March 31, 2021 workout. The school marks lifting as DNP.
Speed is only one part of movement
A straight sprint measures elapsed time over a fixed distance. It does not measure top speed during a game, running with the ball or the ability to change direction. A start, surface or timing method can affect a comparison between events.
Cincinnati selected the receiver fifth overall. Use the LSU event scorecard consistently because secondary compilations report different sprint and agility values. Mixing the fastest mark from each source would create a workout that no single source records.
How to compare the record
Compare the same distance, event type and timing method. A campus report and an electronic event result may use different setups. The reviewed sources here do not provide verified split times or a complete position ranking. Converting this mark into miles per hour would hide how acceleration changes during the run.
What to check for this record
LSU explicitly marks bench press as DNP. That is stronger evidence of nonparticipation than a blank field alone. The school gives a 3.98 second shuttle and a 7.00 second cone, so this profile uses those campus figures together rather than mixing in conflicting compilation values.
Questions readers ask
What do the timing units mean?
Each listed sprint value is elapsed time in seconds over 40 yards. It is not a top speed reading, an agility drill time or a verified split for part of the run.
Does a blank result mean a slow run?
No. A blank means the reviewed source has no recorded time. It cannot establish a failed attempt, a slow run or the reason for a missing result.
Sources and review method
We checked the linked records for this update. Team and school reports can explain the event. Historical tables compile results and may leave fields empty. We keep that distinction visible and do not claim an affiliation with the source publishers.