Reading Vietnam's Athletics Marks: Wind, Shoes, Splits and the Unverified Sample Sizes

The scoreboard at a youth athletics meet held in Hanoi in mid-summer flashed a mark of 10.6x seconds in the boys' under-18 100 metres. The small stand erupted. A few coaches nodded at each other, parents raised their phones to photograph the board, and ten minutes later that mark was sitting in a group chat of sprint coaches across three provinces.

I was in the sixth row, opening my notebook, writing down four questions. Where was the wind gauge, and what did it read in metres per second? What did the starting sensor record for reaction time? What model of shoe was he wearing, and how thick was the sole in millimetres? And what was the 60-metre split?

Four questions, four answers identical to each other: nobody had them. That age group was not fitted with a wind gauge. The track had no reaction sensors. The shoe model could only be seen by walking down to the start. And the splits had never been measured at any youth meet I have sat through.

The mark was still ratified. It went on the board, into scholarship files, and became the anchor for a provincial quota, for a coach's training plan, and for a 17-year-old boy's belief that he had touched a new tier of ability.

I do not call that fraud. I call it a verdict with its annexes torn out. Every injury is a verdict, and I am only the man who reads that verdict through his own legs — but the reader needs the file intact. On that track, four pages of the file had vanished before I could pick it up.

The domestic athletics season runs in a familiar loop: youth meets in early summer, the national championship near year's end, and national-team camps in between to prepare for the SEA Games, the Asian Games and Olympic qualifying. Nothing is wrong with the loop. The gap is in its speed: information travels faster than its own verifiability.

A mark leaving the stadium passes through four pairs of hands. The provincial coach writes it in a logbook. The department's technical office puts it in a report. The national coaching staff cross-checks it against selection targets. The press turns it into a line of copy. With each pair of hands it loses a layer: today the wind reading, tomorrow the shoe model, the day after a note that the track was slightly sloped or the surface still wet. By the last reader, what remains is a string of digits and a name.

I understand why nobody wants to stop at verification. In an athletics system with thin resources, a beautiful mark is money: provincial investment, a scholarship place, direct admission to a sports university, a small sponsor deal, and more important than all of it, the peace of mind of a coach who has spent three years on one child.

But that same mark is what I have to read when the child walks into a clinic with one swollen hamstring.

In my trade there are several markers that cannot be skipped. World Athletics rules that a wind reading of no more than +2.0 m/s is required for records at 100m, 200m, long jump and triple jump. Since 2026, equipment rules cap competition shoe sole thickness at 40mm for road events and 20mm for track events, and require that the shoe be commercially released. The entry standard for the women's 3000m steeplechase at the Paris 2026 Olympics was 9 minutes 23.00 seconds. Those three numbers are not bureaucratic ceremony. They are three anchors that tell you which tier a mark actually sits in.

Based on my experience following domestic athletics across many seasons, the data file I was handed at the start of this season was empty in almost every cell: no wind reading, no shoe model, no splits, no timing system, no sample size. I do not treat that as a dead end. I treat it as the first finding of the season.

The first mask: wind.

If one athlete runs 10.60 seconds with a +1.9 m/s tailwind and another runs 10.60 with a -0.6 m/s headwind, the real gap between them falls somewhere around 0.25 to 0.30 seconds. Over 100 metres, that is the distance between a place in the final and a place on an earlier flight home. Yet at most domestic youth meets, the wind gauge does not exist, and at some provincial meets the organisers' only gauge is locked in a storeroom.

Wind does not only change the number. Wind changes how the body works. Running into a headwind lengthens ground contact time, raises load on the Achilles tendon and the soleus group, and increases ankle work at every step. A speed session in a headwind is, in mechanical load terms, substantially heavier than the same session in still air — even though the coach writes the same drill with the same time target in the logbook.

The trap springs immediately afterwards. An athlete sets a personal best on a tailwind, and the following week's plan asks them to repeat that exact mark in still air. The session is no longer the same session. It is a heavier session, placed on a body that has never once run that fast under its own power.

The second mask: shoes.

The carbon plate in a modern sole returns part of the energy of each foot strike, and for a young athlete that benefit can land somewhere around 1 to 2 percent in sprint events, and higher over distance. That is a real dividend, and nobody has the right to deny it.

The price, however, is almost never written down. A thick sole shifts the strike point, alters ankle moment, and moves load toward the Achilles tendon and the plantar fascia. An athlete who switches from a thin-soled racing flat to a carbon-plated shoe two weeks before a meet will have a pair of feet relearning how to land while the competition calendar gives them no time to learn.

What worries me more is the record-keeping. Very few domestic coaches log their athletes' shoe models session by session. The consequence is that when a personal best appears a week after a shoe change, it is read as a fitness gain and the training plan is immediately ratcheted up. And when the injury arrives three weeks later, we have lost the evidence needed to trace the culprit.

World Athletics rules draw the line at 40mm and 20mm of sole thickness. No rule draws the biological line for a 17-year-old's feet.

The third mask: sample size.

The principle I have used for fifteen years is simple: a single mark is a weather report, three marks repeated within the same 30-day window are a climate. More precisely, I need at least three repetitions with a coefficient of variation under 1.5 percent before I will call something an athlete's baseline.

At Vietnamese youth meets, most athletes have exactly one quotable performance in an entire season. Everything else is a training camp, a provincial meet, an internal test nobody publishes. Then comes the most dangerous category of data: the training mark. A 200m rep with a rolling start, hand-timed, on a slightly sloped stretch of road, later quoted as an official performance in a conversation with a sponsor.

When the baseline is built on a single data point, the entire next month of programming is built on sand. And sand does not bear load for long.

The fourth mask: splits.

This is the part I regret most when working with an empty file. A total time is just the result of an addition. Splits are the deposition of each segment of the body.

I followed one 400m runner for three straight seasons. Last season he ran the first 200m in 22.4 and the second in 24.1. This season the first 200m dropped to 21.6, but the second blew out to 25.0. The total was 0.3 seconds faster, and the whole province celebrated. What I read was a broken race shape: he took more from the opening segment than the closing segment could repay. That distribution is not progress, it is a loan, and the creditor is usually the hamstring.

Over 100 metres I split into three sections: 0-30m, 30-60m and 60-100m. The 17-year-old who opened this piece, if his 60-100m segment is 0.25 seconds slower than his 30-60m segment, is showing the trace of an Achilles tendon beginning to overload, not the trace of a rising talent. For the 400m I need four splits. For the 800m I need eight. Without splits I have nothing to compare, and an analyst with nothing to compare can only produce sentences that sound authoritative and mean nothing.

The hip rotation coefficient never lies; only people insist on misreading it. But I have to be honest about one thing: I cannot measure the hip rotation coefficient of an athlete whose splits I do not have, whose lateral video I do not have, whose shoe model I do not have, and whose wind reading for that session I do not have.

Where the four masks meet.

The open dataset "Vietnamese Injury Code" that I started in 2026, holding 547 athlete records across 15 seasons, gives me a rather uncomfortable rule. Most of the hamstring tears and anterior cruciate ligament ruptures I have read did not come from one brutally heavy session. They came from a two-to-three-week stretch in which training load was raised on the basis of an unverified mark.

The sequence repeats almost identically in every file: a beautiful mark appears, it is checked against a selection target and accepted, the training plan increases volume, the body stays silent for about ten days, and on the eleventh or twelfth session there is a tearing sound. Injury is the one thing on the track that never negotiates.

I have tasted the opposite position. In 2026, when I concluded that a young defender carried a very high risk of anterior cruciate ligament rupture based on a self-built hip rotation coefficient model, the transfer was postponed and I was mocked on forums. On day 64 he left the pitch with exactly the injury I had described. I retell that not to boast, but to show that I know where the cost of a mark with missing annexes lands.

When I tell the story of the four empty data columns at youth meets, reactions usually split into two camps.

The first camp thinks I am belittling children's achievements. They say domestic athletics needs beautiful stories to attract sponsorship, needs marks that fly to persuade parents to send their kids to training. The second camp says the opposite: let the kids run, stop cramming machines into their heads, stop turning the track into a laboratory.

Both camps dodge something far cheaper than they imagine: writing four more columns in a logbook. Measurement does not take away the innocence of a fast child. It only takes away the adults' licence to make things up.

The real paradox sits in the third camp, the one I belong to — the analysts. We, myself included, have a bad habit: ready to declare with certainty when the data is thin, and ready to go silent when questioned. I have eagerly issued percentage forecasts that sounded impressive, and I have read three-page analyses with every cell marked "insufficient information to assess".

These days I choose the empty three-page report. It is more honest. No data is still a conclusion, and sometimes it is the most useful conclusion a reader of bodies can deliver. I do not prophesy; I only read the code the body already wrote. To read it, the writing has to still be there.

I also refuse to let anyone turn every ache into a psychological matter. A tight calf is force and time, measurable with a dynamometer and a clock. And if someone wants to explain a hamstring tear with the word "anxiety", I suggest they first produce the wind reading of that session.

As for the argument over rushing back versus recovering scientifically, I have only one technical remark: an athlete who returns two weeks early loses on average six to eight weeks of the following season. That arithmetic has not changed once in fifteen years of my record-keeping, no matter how loudly people argue.

Starting this season, I propose a minimum standard for every mark published at domestic youth meets: four columns attached. The wind reading, in metres per second. The shoe model and sole thickness. The closing split of the distance. And the competition date plus the timing system, whether electronic or hand-timed.

Those four columns do not require expensive equipment. They require a logbook, a camera placed side-on to the track, and one person accountable for writing it down. I am not asking for fewer marks. I am asking for thicker ones.

Once those four columns appear on the scoreboard, we will stop arguing about whether a child has talent and start arguing about what that child needs in order not to break. That is the only argument worth the time. And the first figure I will track this season is very concrete: the number of youth meets with a compliant wind gauge. If that number rises, Vietnamese athletics will have taken a long stride forward without spending a single additional dong of budget.