Why do my sprinter's shoulders creep up around their ears?
Tight shoulders do not make anybody faster, they burn effort the legs needed and shorten the arm swing that was driving the stride.
It shows up in the last third of a race or on the final rep of a hard set: the neck disappears, the shoulders climb, and an athlete who looked relaxed at 20 metres looks like they are bracing for a hit by 80. Coaches have been shouting 'relax your shoulders' for as long as there has been sprinting, and the cue works because the fault is real and common, not because it is easy to fix by saying so.
Why it happens
As effort climbs toward maximum, or as nerves climb toward a big race, the body recruits muscles it does not need for the job. The trapezius and neck co-contract along with everything else, as if bracing harder everywhere will produce more speed. It will not. Sprint speed comes from the legs and the arms driving in the plane of travel. A locked shoulder adds nothing to that and spends oxygen and attention the legs could have used instead.
What it costs
- A shortened, stiffer arm swing, since a locked shoulder cannot drive the same amplitude a relaxed one can.
- A stride that shortens to match the arms, because the two are coupled and rarely go wrong independently for long.
- Extra energy spent holding tension in muscles that are not producing forward motion, which shows up as fatigue earlier than it should.
What StatLap can and cannot see here
The sprint analysis reports elbow angle against a roughly 90 degree norm, and its own warning for a tight elbow, under about 60 degrees, describes it as arms clamped shut, which locks the shoulders. So a shoulder that is climbing usually shows up first as an elbow angle drifting tighter than it should through a rep, which is a real, reported number worth watching.
There is no shoulder-height measurement in the Film Room. A single side-on camera can read the elbow angle it is built to read, but 'ears near shoulders' is a subtler postural change than any one joint angle, and the app has no landmark for it. Watch the clip yourself for that one, cue a long neck and a loose jaw, and treat a tightening elbow angle as the early warning rather than the whole picture.
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Related
Why does one of your sprinter's arms swing more than the other?
An uneven arm swing usually is not an arm problem. It is a report on which side of the trunk is doing more work.
Read →Why your hurdler's lead arm collapses across their body
The lead arm is meant to punch straight at the lead foot, and when it swings across instead the next stride pays for it.
Read →Why doesn't my sprinter's knee come up in recovery?
A trailing recovery leg is a longer lever that takes longer to swing through, and the cause is rarely the knee itself.
Read →Try it: Sprint timer app: 40-yard dash and flying sprints with one phone