The Nagoya Spreadsheet and 112 Days of Silence: Injury Risk Analysis of Vietnamese Athletics Ahead of the SEA Games

HOOK

The figure 17 sits in the fourth row of my spreadsheet. It is not a number from an official medical report, not data from the federation, but the result of a manual count from the medical room of the Vietnamese athletics delegation at the recently concluded national championship. 17 musculoskeletal injuries in just the first three days of competition, of which nine involved the Achilles tendon and hamstring. These two regions rarely betray an athlete overnight; they accumulate silently through hundreds of training sessions, then surface precisely on the day when the results sheet needs to be confirmed.

I have sat at Toyota Stadium in Nagoya long enough to recognize that Southeast Asian athletics is not short of talents capable of touching the 10-second barrier in the 100m or the 47-second barrier in the 400m. What is missing is an intervention system sophisticated enough to keep those talents on the track for long enough. That manual spreadsheet, across eleven seasons, has helped me read three things that most performance reports fail to record: where the breaking point lies in a training cycle, where the recovery window the body truly needs differs from the one the coaching staff considers sufficient, and the moment when an athlete should stop racing rather than push on because of the competition calendar.

CONTEXT

Vietnamese athletics enters the 2026 – 2026 period with a paradoxical picture. The number of athletes meeting SEA Games qualifying standards by event group has increased compared to the previous two editions, particularly in middle- and long-distance events such as the women's 800m, men's 1500m, and women's 20km race walk. The professional level of doctors and rehabilitation technicians has also risen significantly thanks to cooperation programs with Japan, South Korea, and Australia. However, the rate of severe injuries that force long-term training stoppages remains among the highest in the region, according to sports medicine experts who have worked with Vietnamese delegations.

The problem does not lie in a lack of data but in data fragmentation. Each regional delegation has its own recording system. Major injury cases are rarely fully published regarding time of detection, recovery phase, or load threshold before injury. This creates a gap that external analyses struggle to fill. When I built the manual spreadsheet from 2026, the goal was not to create a complete database – that is unthinkable for a single writer working alone – but to create a reading framework stable enough to identify recurring patterns.

Across 11 seasons, I have identified three recurring patterns in Vietnamese athletics. First, Achilles tendon injuries typically appear in the fifth month of a long training cycle, when the athlete has completed the accumulation phase but has not yet entered the intensification phase. Second, knee ligament injuries are often linked to altitude training camps or harsh climate sessions, where running surfaces and post-training recovery time change without sufficiently rapid adaptation plans. Third, ankle and foot injuries – a group often overlooked because initial symptoms are mild – have the highest recurrence rate when athletes return to competition without completing functional rehabilitation protocols.

These three patterns are not novel findings. However, placing them in a specific time frame – the fifth month, specific training camps, the post-recovery phase – allows me to build an early warning system without requiring complex measurement equipment.

CORE

During the 2026 season, I focused on tracking six key Vietnamese athletes in their preparation cycle for major year-end competitions. These were faces representing three event groups: short to middle distances (100m, 400m, 400m hurdles), middle to long distances (800m, 1500m, 5000m), and technical events (long jump, high jump, race walk). I did not set a goal of including specific names in the spreadsheet; instead, I used athlete codes and recorded every change in training volume and body response through strength and speed tests.

Case ATH 01 – Middle Distance Group

ATH 01 is a 24-year-old female athlete competing in the 1500m and 5000m, who has met SEA Games qualifying standards in two consecutive editions. In June 2026, after a 28-day training camp in Da Lat, she developed persistent right ankle pain. The medical team's initial assessment was early-stage Achilles tendinitis, an area with a high risk of rupture if loading continued. She was prescribed 14 days of rest, a 60% reduction in training volume, followed by a return to light training.

This is precisely where most wrong decisions start. During the 14 days of rest, the athlete was permitted recovery walks and light cycling, but her body retained neuromuscular reflexes from the previous training cycle. When she resumed training at exactly 60% of prescribed volume, the tendon fibers had not fully recovered but were already bearing load again. In the second week after return, she reported a 40% reduction in pain but a sensation of "morning stiffness in the tendon." This is a classic signal of a tendon in subacute inflammation – the inflammatory response has decreased but the tissue has not yet sufficiently restructured.

According to data I have collected since 2026, there are three early warning signals that Vietnamese medical teams often underestimate. The first signal is a change in ground contact pattern during high-speed running, usually detected through slow-motion video. The second signal is a side-to-side calf muscle strength difference exceeding 8% in a single-leg hop test. The third signal is a change in sleeping heart rate – athletes with inflamed tendons typically have resting heart rates 5 to 7 beats higher than baseline. All three signals can be recorded manually but are often missed because backstage monitoring procedures are not standardized.

In the case of ATH 01, after three weeks of returning to 60% training volume, the second and third signals appeared clearly. Based on my tracking experience with Japanese athletes of the same age and distance, the safety threshold for returning ATH 01 to full training requires at least an additional 7 to 10 days of controlled functional rehabilitation. However, the regional competition schedule was imminent, and performance pressure tipped the final decision toward risk: she continued training up to 85% volume after the fourth week and completed the competition with a time 4.2 seconds slower than her personal best in the 5000m.

Case ATH 02 – Sprint Group

ATH 02 is a 26-year-old male athlete competing in the 400m and 400m hurdles. In March 2026, he experienced a 22-day bout of iliopsoas bursitis. This type of injury is common among 400m hurdlers due to the specific technique of clearing hurdles and continuous direction changes. He received conservative treatment, without surgical intervention, and returned to training after 28 days.

However, what is noteworthy is that his hamstring strength test at 4 weeks reached only 87% compared to the uninjured side. The safety threshold for return to competition in events requiring high-speed directional change is typically recommended at 92 to 95%. This gap of 5 to 8% is small but decisive. Studies from the Japan Institute of Sports Medicine show that with hamstring strength asymmetry above 7%, the risk of recurrence of hip and thigh injuries increases 2.3 times.

In the case of ATH 02, he still competed. As a result, he completed the semifinals with a time of 49.8 seconds in the 400m hurdles – 1.4 seconds slower than his personal best. Three weeks after the competition, he reported recurring pain in the right hip area, this time more severe. This is exactly the pattern I have observed in many regional athletes: returning to competition when strength parameters have not reached the safety threshold usually does not create an acute injury but creates a more severe recurrent injury after 2 to 4 weeks.

Case ATH 03 – Technical Group

ATH 03 is a 28-year-old male athlete in the long jump. This is a particularly interesting case because this athlete has no history of major injuries in the last three seasons but developed chronic left Achilles tendon pain from August 2026. According to the data I collected, this condition was linked to a 35% increase in technical jump training volume compared to the same period the previous year, without any compensatory load management for the tendon system.

This is the point where even highly professional delegations often make mistakes. When an athlete has no injury history, the coaching staff tends to accelerate training progress under the assumption that "the body is in good condition." In reality, the absence of injury history only means the tendon-muscle system has never borne load at the breaking threshold, not that it can handle rapid load increases. This is a lesson I learned directly from cases of Japanese athletes while working in Nagoya: the Achilles tendon can tolerate load increases of up to 20% per week during the adaptation phase, but if it exceeds 25%, the risk of tendon inflammation doubles.

Warning System and Risk Matrix

From the three cases above and data accumulated across 11 seasons, I have built a basic risk matrix applicable to Vietnamese athletics. This matrix is not a substitute for medical expertise but a reading framework that helps coaching staff and medical teams see a common picture together.

The highest-risk group is Achilles tendon – hamstring injuries, accounting for 38% of all cases I tracked. This group has a strong connection with the accumulation loading phase and the specific demands of middle- to long-distance competition.

The second risk group is hamstring and hip injuries, at 24%, closely related to events requiring direction changes and sudden acceleration.

The third risk group is ankle and foot injuries, at 19%, often underestimated but with the highest recurrence rate.

The remainder consists of scattered injuries in other regions.

What matters is that each group has a different "golden window" of recovery. For early-stage Achilles tendinitis, the golden window is 14 to 21 days. For Grade I knee ligament injuries, it is 28 to 42 days. For iliopsoas bursitis, it is 21 to 35 days. Exceeding this window without reaching minimum strength thresholds causes secondary injury risk to increase exponentially.

CONTRARIAN

This is the point where I often clash with mainstream views in Vietnamese athletics. Many coaches believe that "athletes need to compete often to accumulate experience" and that "minor injuries are part of the maturation process." I do not entirely reject this view, but 11 seasons of data show a more complex picture.

There is a phenomenon I call the "competition-injury spiral." This spiral begins when an athlete returns to competition before reaching the recovery threshold, performance fails to meet expectations, the coaching staff intensifies training to compensate, the athlete gets injured again, returns to competition sooner than expected, and the cycle continues. Within 18 months, an athlete can experience 2 to 3 consecutive injuries, and personal best times can drop 5 to 8% from peak form.

In Japan, this pattern has long been recognized, and national teams invest in functional rehabilitation systems with budgets accounting for 15 to 20% of total operating costs. In Vietnam, this figure is estimated at only 3 to 5%, according to several team physicians. This is not the fault of the coaching staff but the consequence of a system that has not prioritized recovery at the proper level.

Another counterintuitive point is that "long rest" is not always good. During the 112 days of competition suspension due to COVID-19 in 2026, many Vietnamese athletes returned with improved fitness – but a portion also experienced significant muscle mass loss and required 2 to 3 months to recover. The lesson here is that excessive rest also carries costs, and a maintenance rehabilitation program is needed throughout the rest period.

TAKEAWAY

My spreadsheet is not a tool for predicting the future but a map recording what the body has already said. Vietnamese athletics stands before an important threshold – not the threshold of any single competition, but the threshold of an intervention system sophisticated enough to keep talent on the track long enough. The question is not "who will run the fastest" but "who will still be running five years from now."

Perhaps it is time we stop asking athletes "are you in pain" and begin asking a different question: "what is your body saying that we have not yet heard?"