The inverted-U theory of arousal proposes that performance improves as arousal increases until an optimal level is reached. Beyond this point, further increases in arousal cause performance to decline, producing an inverted-U-shaped relationship.
Arousal is the degree of physiological and psychological activation experienced by an athlete, ranging from very low alertness to intense excitement. At low arousal, the athlete may lack concentration, energy, or motivation, so performance is limited.
As arousal rises, attention and physical readiness improve. At the optimal arousal level, the athlete is sufficiently alert and energized without becoming overwhelmed, so performance reaches its highest level.
If arousal continues to increase, the athlete becomes over-aroused. Excessive muscle tension, rushed decisions, narrowed attention, and reduced coordination can then lower performance.
| Arousal level | Likely effect on performance |
|---|---|
| Low | Limited alertness, motivation, and concentration; performance is below its potential. |
| Optimal | Appropriate focus, readiness, and control; performance is highest. |
| Excessive | Anxiety-related symptoms, tension, attentional problems, and errors reduce performance. |
For example, a basketball player with very low arousal may react slowly. At an optimal level, the player is focused and executes a free throw effectively. With excessive arousal, increased tension and worry may disrupt technique and accuracy.
The optimal level is not necessarily identical for every athlete or activity. Complex or precision-based skills generally benefit from lower arousal than simple, gross, or power-based skills. Experience and individual differences can also affect the athlete's preferred arousal level.
A common misconception is that greater arousal always produces better performance. The theory instead predicts improvement only up to an optimum; further arousal becomes detrimental.
In an IB SEHS response on C.4.1 Arousal and anxiety, define arousal, explain all three stages of the relationship, and apply the theory to a sporting example. If interpreting a graph, identify arousal on the horizontal axis and performance on the vertical axis. Do not confuse arousal with anxiety: arousal is activation, whereas anxiety includes negative cognitive or emotional responses.
