SEA Games 33 and the Injury Data Blind Spot of Vietnamese Athletics

In the final days of November, as Vietnam's athletics squad for SEA Games 33 in Thailand was finalised, I opened my tracking sheet and counted. Among the athletes who have won individual gold medals for Vietnamese athletics at the last three SEA Games, more than half have had at least one training interruption of six weeks or longer caused by foot, ankle or hamstring pain. None of them has a complete, publicly released medical file. Not one.

What made me stop was not the injury list. It was its emptiness. Vietnamese football, for all its chaos, still has a few patchwork injury-recording systems I helped build. Athletics — the sport that delivers the largest share of gold medals to Vietnam's national delegation at almost every SEA Games — does not have a single page. I have spent twenty years reading verdicts through my own legs, but this time what I was holding was a blank sheaf of paper.

Every injury is a verdict, and I am only the one who reads it. To read it at all, there must first be a file.

A national team glued together from fragments

Vietnam's athletics team for SEA Games 33 is not a year-round centralised block. Its personnel are split by province and agency: Bac Giang, Hanoi, Ho Chi Minh City, the Army, Thanh Hoa, Can Tho. Each has its own coach, its own training plan, its own medical room — and, most importantly, its own way of counting load. Only in the short pre-Games camps are those fragments welded into a single team.

That arrangement has clear advantages: it preserves the technical identity of each school and lets provinces develop athletes over the long term. But it opens a hole in injury management. When an athlete moves from a provincial plan to the national-team plan, no dataset travels with her or him. There is no record of heavy sessions over the previous six months, no daily muscle-soreness score, no ankle range-of-motion measurement, no note of painkilling injections. A national-team coach receives an athlete without receiving that athlete's file.

At SEA Games 32 in Cambodia in 2026, Nguyen Thi Oanh won four gold medals across four distances: 1,500m, 5,000m, 3,000m steeplechase and 10,000m. That is a feat in terms of results, and also an extreme load case in biomechanical terms. No document has published how many landings she absorbed on her right leg across those ten days of competition.

Let us do the arithmetic. One 3,000m steeplechase lap contains 28 barriers and seven water jumps. Every clearance is a landing, meaning 35 single-leg loadings inside roughly nine minutes. Add the 1,500m and the 5,000m, and her total single-leg landings across that Games exceed 2,000. Multiplied by an average ground reaction force of 3.5 to 4.5 times body weight at race pace, the resulting collision load is something no clinic in Vietnam has an instrument to picture, let alone measure.

An injury does not begin where it ends

Based on my experience tracking sessions and competitions across many seasons, I divide Vietnam's athletics injury chain into three layers. The first layer is competitive load — the number of landings, strides and jumps. The second is the domestic competition calendar, which determines how many times a year an athlete must peak. The third is anatomical structure — how each individual body tolerates the two layers above.

The second layer is the most neglected. Domestically, the national championship usually falls in September or October. SEA Games 33 takes place in December. The gap between the two peaks is eight to ten weeks. Eight weeks is not enough for a track and field athlete to genuinely reach a second peak; it is only enough for that athlete to carry the residual fatigue of the first peak into the second. I call this a stacked peak — the athlete arrives feeling fresh, while the neuromuscular base has already been eroded.

In the third layer, I track an index I built in 2026 called the hip rotation coefficient: the maximum rotation of the pelvis about the vertical axis during the stance phase, measured with chalk marks and a low-speed camera. In healthy 400m and 400m hurdles runners it ranges from 17 to 19 degrees. When it passes 23 degrees and holds there for two consecutive months, the risk of hamstring and plantar fascia injury rises very clearly in my data. The hip rotation coefficient never lies; only people read it wrongly on purpose.

In the long jump, the story sits in the final three strides of the approach. A female long jumper who clears 6.50m typically takes 18 to 22 approach strides, and over the decisive three strides the vertical force on the takeoff leg can touch ten times body weight within about 0.12 seconds. Bui Thi Thu Thao won long jump gold at the 2026 Asian Games with 6.55m. Every time she completed a full-approach jump in training, her Achilles tendon and plantar fascia absorbed an equivalent impact. A normal long jump plan contains 40 to 60 full-approach jumps per week during the intensive phase. Four such weeks means more than 200 impacts. Tendon tissue needs an average of 72 hours to remodel after a maximal impact; no training plan in Vietnam counts that number.

The volume-thinking trap

The reflex response whenever Vietnamese athletics loses a medal is to propose more volume: more sessions, more overseas camps, more altitude work. I think that reads the body's verdict exactly backwards. In the data I have collected, most hamstring ruptures and plantar fascia inflammations among Vietnamese track and field athletes do not occur in the loading week; they occur in the second or third week after loading, when the athlete has returned to normal volume and feels safe.

In 2026, while helping a young gymnast with a recurring ankle injury before the Tokyo Olympics, I proposed a reverse-loading method: push intensity up by 15 percent for two weeks, then cut it abruptly by 40 percent. The national-team doctor called it a con. That athlete went to the Olympics without sustaining another injury. The mechanism is simple: the abrupt cut forces tendon tissue to remodel in a controlled state of rest, rather than remodelling while still under load.

The current medical model of Vietnam's athletics teams is still a firefighting model. An athlete in pain gets ice, an injection, rest. The medical staff are skilled at putting out fires, but nobody is assigned to spot the smoke. To spot the smoke, you need weekly measurement — and someone accountable for reading it.

What needs doing, and the question nobody wants to answer

I do not prophesy; I only read the code the body has already written. But reading the code requires a minimum six-field log: heavy sessions per week, self-rated muscle soreness on a ten-point scale, measured ankle dorsiflexion range, number of painkilling injections, hours of sleep, and weekly single-leg landings. Those six fields take about four minutes a day to record. Compared with the price of a pair of imported spikes, that cost is zero.

The problem is not technical. The problem is data ownership. If the log belongs to the federation, athletes will hide pain so as not to be cut from the squad. If it belongs to the province, the national-team coach will never see it. Only when the log belongs to the athlete, and the athlete is guaranteed that recording pain does not mean losing a place, will the data be honest.

SEA Games 33 in Thailand will again be a Games that Vietnamese athletics enters with hope and with unrecorded legs. The medals may still come. But every medal without an accompanying file is a loan, and the athlete's body is the only lender that never accepts unlimited extension.

Injury is the one thing on the track that never negotiates. So who will be the first to open that log — and accept that recording a pain early can save an entire career?