On-Water Prescribed Training Intensity Distribution and Ability-Related Training Composition in Elite Junior Male Canoe Sprint Athletes Preparing for the 2025 ICF Junior Canoe Sprint World Championships: An Observational Case Study

In the world of competitive sports, coaches and scientists have long debated how to best organize an athlete's training year. The central question is not just how hard to train, but how to balance different types of effort. Imagine a spectrum of intensity: at one end lies slow, steady work that builds a foundation; at the other sits short, explosive bursts that push the body to its absolute limit. In between are efforts that mix these qualities. Researchers have developed models to describe how much time an athlete should spend in each of these zones. Some models suggest a "pyramid," where the vast majority of time is spent at the bottom, with smaller and smaller amounts of time moving up toward the peak. Others suggest a "polarized" approach, where athletes spend most time at the very bottom and the very top, skipping the middle. Understanding which of these patterns works best for a specific sport is crucial, especially for young athletes who are still growing and developing their bodies.

This study turns its attention to the Chinese National Junior Canoe Team, a group of elite young men preparing for the 2025 International Canoe Federation Junior World Championships. The researchers wanted to see exactly how this specific team organized their time on the water over the course of a full year. They did not change the training or tell the coaches what to do; instead, they acted as careful observers, recording every minute of paddling the athletes performed. The goal was to map out the actual training plan as it was prescribed by the coaching staff, looking at how the volume of work and the intensity of effort shifted as the team moved from general preparation into the final weeks before the big race. By examining the data, the authors hoped to describe the real-world structure of training for these high-level junior athletes, providing a clear picture of what actually happens in a successful preparation cycle.

The team followed six athletes over a thirty-five-week period, which included thirty-four weeks of active preparation and one final week of recovery after the championship. The researchers tracked every session the athletes completed on the water, measuring the time spent actively paddling while ignoring rest periods. They categorized each piece of training based on the intensity the coaches had assigned before the session began. This system used a six-level scale, ranging from very light recovery paddling to maximum-effort sprints. To make the data easier to understand, the researchers grouped these six levels into three broader zones: a low-intensity zone, a moderate-intensity zone, and a high-intensity zone. They also looked at the purpose of the training, classifying sessions as either focused on building aerobic endurance, mixing aerobic and anaerobic efforts, tolerating metabolic stress, or developing pure speed.

The results showed a clear pattern in how the training volume changed over time. During the early preparation phases, the athletes paddled an average of 325 minutes per week. As the season progressed and the competition date approached, this amount gradually decreased. By the time the team entered the final competition phase, the weekly volume had dropped to 210 minutes. This reduction aligns with the standard practice of tapering, where athletes reduce their total workload to recover and peak for a major event. Throughout the entire period, the low-intensity zone remained the dominant form of training. When looking at the total time spent paddling, the low-intensity zone accounted for nearly 58 percent of the volume. The moderate zone made up about 24 percent, and the high-intensity zone comprised the remaining 18 percent. This distribution creates a shape often described as a pyramid, with a wide base of easy work supporting a smaller peak of hard work.

Interestingly, this pyramid structure remained consistent throughout the entire year, even as the specific mix of training shifted slightly to meet different goals. In the early weeks, the low-intensity zone was even more dominant, taking up over 61 percent of the time. As the team moved into the competition phase, the proportion of moderate and high-intensity work increased slightly, but the low-intensity base never disappeared. In the final weeks before the championship, the low-intensity zone actually surged back to over 73 percent of the total volume, while the harder efforts decreased. This suggests that the coaches maintained the fundamental pyramid shape but adjusted the proportions within it to manage fatigue and sharpen performance as the race drew near.

Beyond intensity, the study also examined what the athletes were actually trying to achieve with each session. The vast majority of the training time, about 83.5 percent, was dedicated to aerobic-oriented work. This type of training focuses on building the engine that allows an athlete to paddle for long periods without tiring. The next most common category was mixed aerobic-anaerobic training, which made up about 11 percent of the time and aimed to sustain high power output. The remaining time was split between training designed to build tolerance to metabolic stress and sessions focused purely on speed. These two categories were relatively rare, accounting for less than 6 percent of the total volume combined. The data showed that while the team did include these specialized, high-intensity elements, they were used sparingly and strategically rather than as a major part of the daily routine.

The researchers were careful to note that their findings describe what happened in this specific group of athletes, not necessarily what is the absolute best way to train everyone. They emphasized that they were observing a prescribed plan, meaning they recorded what the coaches told the athletes to do, rather than measuring the exact physiological response of each individual. The study did not prove that this pyramid approach is superior to other methods, nor did it determine if this specific plan caused the athletes' success at the World Championships. Instead, it offers a detailed snapshot of how a successful junior team organized their work. The athletes in the study performed well, with one winning gold and two winning silver, but the authors caution that their training structure is just one example of how elite preparation can look.

Ultimately, this observational case study provides a rare, detailed look at the day-to-day reality of elite junior canoe training. It confirms that even at the highest levels of youth sport, the foundation of training remains a large volume of steady, low-intensity work. The hard, explosive efforts are present, but they are carefully placed on top of that massive base. The study shows that coaches can maintain this general structure while making subtle adjustments to the mix of intensities as the season progresses. For anyone interested in how elite athletes prepare, the picture is clear: the path to the podium is paved with thousands of minutes of steady paddling, punctuated by brief, intense bursts of speed.