Load and the Body: Decoding the Injury Wave in Vietnamese Volleyball

At minute 23 of the fourth set, I was sitting in the third row of press seats from the court, close enough to hear the heavy breathing of players during long rallies. The crowd rose to its feet after a seemingly impossible defensive play. Nobody noticed that the home team's middle blocker had twice tapped her left foot before each jump to block. I noticed. That is a professional habit that has sunk deep into me over thirty years in this job: people watch the ball, I watch the body underneath the ball. The match ended in the fifth set, 15-13 for the home side. That night, I received a message from a friend working as a physiotherapist at the training centre: the middle blocker would miss the next round due to pain in her left knee. The preliminary diagnosis was stage-three chronic patellar tendinopathy — what sports medicine calls, in short, "jumper's knee." Wounds never lie, but they never tell the whole story either. That scene is not an isolated case. It is a common denominator I have observed across many Vietnamese volleyball seasons. Over the last three seasons, I have logged the national championship's fixture list and noticed a worrying pattern: teams play on average two matches a week for four straight months, plus cup competitions and friendly matches. A key player in the middle-blocker or opposite position can jump to block and attack more than a thousand times in a single season. That is a number the human body — no matter how well trained — is not designed to endure without a matching recovery phase. What troubles me is not the injury itself. Injury is an inevitable part of elite sport. What troubles me is how we read — or fail to read — the signals the athlete's body sends before it breaks. People watch the scoring reel, I watch the injury reel. And in most cases I have followed, the wound had been speaking softly for a long time before it was forced into the light. The context of this story is not a single match but an entire competition calendar. Vietnamese volleyball currently has a particularly dense structure: the national championship split into two phases, plus the National Cup, plus youth tournaments, plus national-team training camps. A player in the national squad can face an almost continuous schedule from January to November. Compared with developed volleyball nations such as Japan or South Korea — where the season lasts about six to seven months but includes carefully calculated rest periods — this is a structural difference, not a difference in effort. I once had the chance to talk with a youth-team doctor. He said something I copied verbatim into my notebook: "Our problem is not treating injuries, it is convincing people that sometimes not playing is also part of training." That sentence condenses the entire paradox I want to dissect here. In volleyball there is a basic biological paradox that few outsiders understand clearly: each attacking jump places a load on the patellar tendon equivalent to about seven to eight times body weight on landing. For a 70 kg athlete, that is nearly half a tonne of force funnelled through a tiny point at the knee. Repeating this movement hundreds of times a week, the body has only two choices: adapt or protest. Injury mechanisms in volleyball can be divided into four main groups, each with its own "handwriting" on the body. The first is repetitive-load injury — patellar tendinopathy, Achilles tendinopathy, periostitis. These wounds do not come from a collision but from accumulation. They are silent, they do not make headlines, but they are the leading cause of athletes sitting out for weeks on end. The second is landing-mechanism injury — ankle sprains, anterior cruciate ligament tears. These usually happen suddenly when a player steps on a teammate's or opponent's foot after an attack. The third is shoulder injury — rotator-cuff tears, common in heavy-hitting attackers. The fourth is back injury, especially lumbar disc herniation, a direct consequence of the arched posture during attack and the crouch during defence. Among these four, the first group is the silent killer. I have tracked injury data at club level across many seasons. Notably, repetitive-load injuries account for most cases that force time off, yet receive the least media attention. A player with an ACL tear will be in the news for a week. A player quietly battling patellar tendinopathy for three months — performing below peak, jumping lower, blocking half a second slower — will never be mentioned. That is a worrying analytical blind spot. Three seconds of judgment on court, three months of decoding in the medical room. When a middle blocker jumps lower than usual, when an opposite attacks with a narrower shoulder range, when a libero moves a step slower — those are not tactical signals. They are biological signals. But because volleyball is a sport of continuous rhythm, those signals drown in the flow of the match. I recall a women's team I followed closely for a season. They had two key attackers, and in the first half of the season both played almost every set. By the second half, one began to show declining attacking efficiency. Her points dropped from an average of 4.2 per set to 3.1. The coaching staff attributed it to form or psychology. They increased training, added technical drills. The result was a hamstring tear in a training session. A month later she returned with a thigh wrap and never regained her old level. Injury is the body's handwriting on the scoresheet, and in this case the body had written a long letter for months that nobody bothered to read. To understand why this happens, we need to look at the load structure of a volleyball season. I have spent much time studying the correlation between match density and injury rates. The result shows a fairly clear rule: when the rest interval between two matches drops below four days, injury rates among players over 27 rise significantly. For younger players the rate rises more slowly, but that does not mean they are safe — it only means their bodies still have enough resilience to postpone the collapse. Postponement is not exemption. Another factor I consider important but often overlooked is post-match recovery. In volleyball, a match can last from 90 minutes to over two hours, with hundreds of jumps, dozens of dives and constant lateral movement. After the match, the body needs a certain window to resynthesise muscle glycogen and repair micro-damage in muscle fibres. If that window is squeezed by the fixture list, the body enters the next match with an unpaid "debt." And that debt will be paid at some point — not in money, but in connective tissue. In the context of Vietnamese volleyball, this is complicated by a reality: most teams lack the personnel for rotation. A team with only one truly elite starting middle blocker will have to play her almost every set. Substitution is not only a tactical question but a manpower question. This is a systemic difference from the top Asian leagues, where a team can have three middle blockers of comparable quality and rotate based on physical condition. I once witnessed an internal debate at a club. The head coach wanted to keep his key player for an important match, while the team doctor recommended resting her one round to reduce inflammation. In the end, the coach won. The player played two sets, then had to leave the court with a recurrence. The result was not just a defeat but three weeks out at the decisive stage of the season. It is a problem with no perfect answer: between short-term risk and long-term risk, no choice is entirely right. This is where I need to be explicit about a sporting culture I believe directly influences injury rates: the culture of playing through pain. In sport in general and volleyball in particular across many settings, playing while hurt is seen as a heroic quality. The player who stands on court with tape and tears will be remembered more than the one who withdraws in time to protect her long-term career. Media, and sometimes fans, unintentionally encourage this self-harm behaviour. But here is the counter-intuitive point I want to stress. I believe that in elite volleyball, daring to rest is also a high-level professional skill. Not an evasion of responsibility, but the ability to read one's body and turn that understanding into a timely decision. The longest-careered athletes I have seen are not those who played the most, but those who knew when to play and when to step aside. They do not rhetorise about pain; they manage it with data and discipline. It must also be said: the stigma against rest does not only come from the club. Sometimes it comes from the athletes themselves. I remember a conversation with a female player who had suffered a shoulder injury. She told me she felt "guilty" whenever she sat out, that she feared being seen as weak, feared losing her place. That fear is entirely reasonable psychologically yet counterproductive biologically. One thing I have learned from years of following teams is that the role of the medical staff should not stop at treating injuries once they occur. Their real role is to build an early-detection system — a toolkit to measure the body's condition before it protests. In developed volleyball nations, teams routinely use load tests, muscle-strength indices and video analysis to detect small changes in technique — such as a player starting to land flat-footed instead of on the ball of the foot, or reducing arm-swing range on attack. These are early warning signs of repetitive-load injury. But early detection is only valuable if it leads to action. A detection system without intervention authority is just a recording system. I believe there needs to be a mechanism giving the team doctor a decisive voice in determining a player's competitive load. This is not simple, because in volleyball, as I said, a thin squad turns every substitution decision into a tactical gamble. I once put this question to a senior sports official: if you knew a player were at high injury risk, would you rest her for a decisive match? The answer, after a pause, was: "It depends on who that match is important to." That is a more honest answer than any flowery statement, and it shows the problem is not medical knowledge but the structure of incentives. Another aspect to consider is the difference between positions. Not every position carries the same load. The middle blocker has the highest jump count, averaging 40 to 60 jumps per match. The opposite follows with about 35 to 50. Outside hitters jump slightly less but perform more attacking movements with greater shoulder range. The libero jumps least but carries the greatest load on the lower back and knees due to constant crouching and lateral movement. This means a scientific load-management system cannot apply the same formula to every position. A 30-year-old middle blocker needs a different recovery protocol from a 24-year-old libero, even if both play the same number of sets. This is a point many teams overlook. Load calculation should be based on "high-quality jump counts" rather than sets or minutes alone. I first encountered this concept when studying teams in Japan. There, teams use wearables to measure jump counts in every training session and match, then calculate a safe threshold for each individual. When a player exceeds the threshold, the coach receives a warning. This is not expensive technology but a disciplined process. Strikingly, in Vietnamese volleyball many teams still manage load by the coach's subjective feel or the player's self-reported fatigue. This approach ignores a reality: players often under-report for many reasons — fear of losing their place, fear of being seen as not trying hard enough, or simply not yet recognising the severity of their condition. This is a point I consider essential in any discussion of injuries in Vietnamese volleyball: players are not self-updating data sheets. They are human beings inside a complex incentive system, where admitting pain can mean losing an opportunity. If we want to understand and reduce injuries, we must start by changing that incentive system, not just by raising medical knowledge. Another notable trend in recent seasons is the inconsistent use of pre-season fitness testing across teams. Some conduct a full battery of functional tests — measuring shoulder range of motion, ankle mobility, hamstring-to-quadriceps strength ratios. Others stop at general cardiovascular and fitness tests. This inconsistency creates a data gap from the very start of the season, making individual risk assessment less accurate. There is a question I believe we all need to ask ourselves: how are we treating the athlete's body? As a replaceable tool, or as a long-term asset? The answer will determine how we build calendars, organise training camps, and praise or criticise rest decisions. From the perspective of an outside observer, I notice Vietnamese volleyball has a precious resource many other nations lack: community cohesion and fan passion. But this resource can be a double-edged sword if it turns playing through pain into a symbol of loyalty. Fans can be part of the solution if they learn to value decisions that protect players' health rather than chasing only spectacular plays. Not long ago, I reread notes about a player I once followed. She began her career at 17, peaked at 24, and started a string of injuries at 26. By 30, she retired. In our last conversation she said something that stayed with me: "I wish someone had told me to stop a year earlier." This is not a reproach of any individual. It is a reproach of a system. Interestingly, looking back at sports history, this culture of playing through pain is not immutable. There were periods when teams prioritised long-term durability over short-term results, and others when they did the opposite. What changes is not human nature but the incentive system. When rest is seen as part of strategy rather than failure, behaviour changes. This is a lesson from other sports, from football to athletics, where leading teams have shifted from a culture of endurance to a culture of load management. I do not naively think there is a perfect solution. Elite sport always demands risk, and pushing the body to its limits is part of the game. But I believe there is a difference between calculated risk and unconscious recklessness. The difference lies in information — in knowing what we are risking and why. I think about what a national-team doctor once told me: "Don't ask the player where it hurts, ask what he is hiding." This is a lesson I have carried throughout my career. And it remains valid as we discuss the future of Vietnamese volleyball. Because behind every statistic, every medal, every long training session, there is always an untold story of the body — a handwriting on the scoresheet that people often forget to read. One thing I am certain of after thirty years of watching: if we keep measuring a team's value by wins while failing to measure the price the athletes' bodies pay, we will keep reading injury news reactively instead of preventively. We will keep being surprised by injuries that should have been foreseen. And we will keep treating athletes' bodies as infinitely repairable, rather than as a finite gift to be treasured and protected. Tran Dinh Trong is a lesson I will never write as advice, because not everyone can learn from it. But I believe that if there is one thing Vietnamese volleyball needs to learn from other sports, it is this: protecting athletes' bodies is not the opposite of achievement. It is the prerequisite for sustainable achievement. A strong volleyball nation is not one with the most matches, but one that allows its most talented players to have the longest careers. When we understand that, we will begin to read athletes' bodies with respect and care. And then every jump will be not merely a sporting action, but the expression of a system caring properly for the people who make this sport beautiful.