Why Do Baseball Players Get Injured? Understanding Load, Tolerance, and Recovery

Playing baseball, just like any sport, comes with a risk of injury. Baseball involves repeated bursts of high-intensity activity, often with little warning, and this can put a player at risk of suffering an injury. A player may spend several minutes relatively inactive before suddenly sprinting, diving for a ball, taking an explosive swing, or throwing the ball across the diamond. The demands of the game can also vary depending on the player’s position, age, and level of play. Baseball exposes athletes to demanding positions and actions. This doesn’t automatically mean that baseball is inherently an injurious sport, though, and we can understand this by looking at how players are able to handle these demands.

The Body Adapts to Physical Demands

The human body is amazing because it has the ability to adapt. While we may develop holes in our socks, shoes, or batting gloves over the course of a season, our bodies have the ability to heal and make themselves stronger. When we perform the actions and movements of baseball, forces are applied to the body, placing it under stress, but this isn’t inherently a bad thing. Stress on the body is the stimulus that drives adaptation, much like performing bicep curls can increase bicep size. Appropriate loading can improve skill and increase the body’s tolerance to physical demands. Pitchers throw harder as they develop their technique and build arm strength through throwing programs. Hitters’ core and hip muscles become accustomed to the repeated rotational demands of swinging a bat. However, these adaptations take time and consistency in order to develop, and when loads are not appropriate, that is when injuries can occur.

Understanding Load and Tolerance in Baseball

When we look at it from the broadest sense, injuries can be explained by load and tolerance. Load is the physical demand placed on the body. For example, load describes the forces placed on a pitcher’s elbow and shoulder with every pitch, but it also encompasses how many pitches they throw, how often they play, and the combined demands of all the other baseball movements, their strength training, and other physical activity. Tolerance describes the amount and type of loading the athlete is currently prepared to handle. Load and tolerance are not fixed, nor are they the same for every player or activity. A player might tolerate a certain throwing program, but another may need slower progression. They may be well prepared for running because of their off-season training, but less prepared for repeated, high-intensity sprinting like in games. A workload that was manageable last month might be harder to tolerate following an illness or an increase in stress from work or school. Load and tolerance are not concrete numbers, but rather a way to conceptualize training and injury. It is the relationship between the load placed on a baseball player and their tolerance for that load that matters, rather than load or tolerance in isolation.

Examples of Load and Tolerance in Baseball

A couple of examples may help illustrate how the relationship between load and tolerance can contribute to injury.

• A player running to first base lands on the edge of the base, causing their ankle to roll inwards and resulting in an ankle sprain. The load placed on their ankle is substantial due to all of their weight landing on their ankle during a sprint, more than what the ankle ligaments can tolerate.

• A pitcher returns from their off-season having not thrown for several weeks, and begins throwing at the same volume and intensity as they normally do in-season. Because they have not thrown for some time, their tolerance to throwing is low. By immediately jumping into their in-season workload, they are placing a large load on their throwing arm. Their throwing demands have increased quickly, while their body has limited tolerance and time to adapt.

The first example describes an acute injury usually associated with a relatively sudden event, whereas the second example describes an overuse injury where repeated loading

contributes to symptoms over time. However, many injuries are not always this clear-cut. An overuse problem may become apparent after a single throw, even though the contributing process developed over weeks. Likewise, an acute injury doesn’t necessarily mean that the player was poorly conditioned or that the workload was excessive.

What Influences Injury Risk in Baseball?

Load and tolerance can be influenced by various factors to various degrees. When thinking about the loads placed on baseball players, we need to consider their throwing program (frequency, intensity, volume), number and frequency of games, strength and conditioning program, and other sports, physical activity, or career outside of baseball. We also need to consider any changes to the above. When thinking about a player’s tolerance, we need to consider their overall health and physical conditioning, age and physical development, training and sport history, previous injuries, sleep quantity and quality, recovery between sessions, psychological and social well-being, and stress or other demands outside of baseball.

A demanding weekend of baseball might actually be manageable for a well-prepared and conditioned player who has recovered adequately between games. However, the same schedule might be harder to tolerate for someone returning from a vacation, fatigued from the gym, or recovering from an injury.

It is important to stress, though, that these factors interact with one another to influence load and tolerance, and therefore injury. These are not direct cause-and-effect explanations for an injury. They can influence performance, recovery, and risk of injury, but it is not accurate to blame an injury on one factor alone.

An Injury Doesn’t Mean You Did Something Wrong

At a broad level, load and tolerance can help us understand why injuries occur, but they don’t tell us exactly why. Sometimes we can point to certain contributors as being a likely cause, but there could still be other factors that unknowingly contributed. A player can follow a sensible training program, build their tolerance gradually, and recover appropriately, yet still sustain an acute or overuse injury. All sports involve unpredictable movements, contact, individual differences, and circumstances that aren’t always visible or controlled. Even when a risk factor is identified after an injury, that doesn’t automatically mean the injury could have been predicted or prevented. The load-tolerance model is a way to understand factors that influence injury risk, rather than assign blame.

The relationship between load and tolerance can be a good model for explaining why injuries occur in baseball. Baseball places loads on a player, but this is not necessarily bad; regular loading is needed for players to adapt and become better players. Injuries can occur when there is a mismatch between these loads and what the player can tolerate. Although we can’t predict or prevent every injury, there are steps players and coaches can take to manage training demands and recovery:

• Build up training and baseball demands progressively when possible.

• Pay attention to changes in workload, not just the total amount of activity.

• Allow time to recover.

• Take persistent or worsening symptoms seriously rather than just pushing through them.

• Consider the athlete as a whole, including other sports and physical activity, work, health and well-being, age, and stress.

Injuries can be frustrating because so many factors can influence load and tolerance. But that also gives us many options for preventing, mitigating, and recovering from injuries. We can’t control every factor involved in injury, but understanding load and tolerance helps us make better decisions about training, recovery, and rehabilitation.