Losing Streaks in Sports: The Psychology and Physiology Behind Why They Happen

Key Takeaways: Losing Streaks in Sports

• Losing streaks are influenced by more than luck or declining ability. Research suggests that recent defeats can affect future behavior and performance through a combination of physiological and psychological mechanisms.
• The loser effect is well established in animal research, while evidence in humans is growing but remains more limited and highly dependent on context.
• Defeat can be followed by short-term changes in hormones such as testosterone and cortisol, but these responses vary between individuals and do not fully explain why some athletes recover quickly while others struggle.
• Self-efficacy, fear of reinjury, personality, previous experiences, and the way a setback is interpreted may all shape an athlete’s response after a loss.
• Evidence from combat sports suggests that recent contest outcomes can influence short-term performance within the same tournament, but current research does not show that a single defeat determines an athlete’s long-term career.
• From both clinical practice and personal experience, setbacks in sport often mirror setbacks elsewhere in life. The same event can either undermine confidence or become valuable feedback, depending partly on how it is interpreted.
• The most practical lesson is not that we are prisoners of our physiology, but that understanding our initial response to failure may help us recover, learn, and continue developing rather than allowing one defeat to become a self-fulfilling prophecy.

Introduction: Losing Streaks in Sports

Fighters who once looked untouchable sometimes experience several losses after years of dominance, with the first defeat later appearing to mark a turning point in their careers. Anderson Silva was stopped in two consecutive title fights by Chris Weidman in 2013 and went on to win only one of his final seven UFC appearances, with one additional bout ruled a no contest. Conor McGregor has now lost four of his five fights since his 2018 defeat to Khabib Nurmagomedov, including three consecutive losses in his most recent appearances.

It is easy to feel motivated when everything is going well. Success reinforces confidence, training feels meaningful, and the next challenge seems manageable. In my view, the deeper test of a fighter often begins after defeat, when confidence has been shaken and the path forward is less certain. I recognized that feeling at times during my own competitive career, particularly after a loss. The physical result is recorded immediately, but the psychological effect may remain long after the contest itself has ended.

This is not unique to combat sports. Setbacks in work, health, relationships, or everyday life can also affect motivation, confidence, and the willingness to try again. In clinical practice, I meet patients who are struggling with this same broader pattern: one difficult experience begins to influence how they approach the next one. That does not mean every setback inevitably leads to another, but it helps explain why recovering psychologically can sometimes be more difficult than simply moving on to the next task.

Fans and commentators often reach for familiar explanations when successful athletes begin to lose—declining motivation, aging, injury, or bad luck. Research in endocrinology, behavioral ecology, and sport psychology offers another possible perspective. Competition outcomes can be followed by measurable hormonal responses in humans, while animal research shows that previous wins and losses can influence subsequent contest behavior [1][4]. In behavioral research, these patterns are commonly discussed as winner and loser effects. The phenomenon is well established in animal contest research, whereas experimental evidence in humans remains more limited and context-dependent.

Losing Streaks in Sports: A Measurable Pattern, Not Just a Narrative

The idea that prior contest outcomes shape future ones is not folklore. In animal studies, it has been documented under the umbrella term “winner and loser effects”: individuals that have recently won a contest tend to behave more aggressively and are more likely to win the next one, while individuals that have recently lost tend to behave more submissively and suffer a higher chance of losing again [4]. This loser effect has been documented in species including fish and mammals [4][6], though the picture is not perfectly uniform — one study in fruit flies found that prior contest experience, whether a win or a loss, increased aggression and future fighting success compared to naive individuals, a more complex pattern than a simple “losers keep losing” rule [5]. Separately, a set of randomized experiments has extended the winner-loser effect specifically to humans, showing that randomly assigned winners in an initial contest go on to outperform randomly assigned losers in a second one, with similar effect sizes in men and women [8].

In humans, a meta-analysis covering 60 effect sizes and more than 2,500 participants found that competition outcome reliably affects testosterone response, and that this effect is strongest in real-world sport settings rather than laboratory tasks [1]. These findings may also be relevant to combat sports, although the meta-analysis itself did not identify combat sports specifically — or the physicality and public nature of a contest — as moderators of the effect; it only distinguished laboratory from non-laboratory settings more broadly [1]. It also suggests that a losing streak in sports is not purely a mental narrative athletes tell themselves; it has a measurable starting point in the body.

In clinical practice, I sometimes meet patients with confirmed hypogonadism who describe a substantial improvement in their overall well-being after starting testosterone replacement therapy. Some also report feeling more confident in themselves. That observation is relevant here, but it needs to be interpreted carefully. Energy, fatigue, mood, and self-confidence are all multifactorial, and testosterone is unlikely to explain them on its own.

Many patients who feel tired or depressed are understandably interested in having their testosterone measured, and I do occasionally see low values in that context. However, a low result does not automatically mean that true hypogonadism is present. In my own clinical work, clearly established hypogonadism is much less common than patients often expect.

This creates a familiar chicken-and-egg problem: is low testosterone contributing to the fatigue or low mood, or are depression, exhaustion, poor sleep, stress, and reduced overall health contributing to the low testosterone level? Testosterone may influence how a person feels, but testosterone levels may also respond to broader changes in physical and psychological well-being.

For that reason, I would be cautious about using these clinical observations as direct evidence that testosterone determines confidence or explains the loser effect. Their main value is to illustrate that the relationship between hormones, mood, and self-perception may be bidirectional rather than simple and one-way.

The Hormonal Mechanism Behind Losing Streaks in Sports

One of the best-studied physiological responses to victory and defeat involves two hormones: testosterone and cortisol. In competitive contexts, winners tend to show a rise in testosterone relative to losers, a pattern researchers call the winner-loser effect [1]. In badminton players, researchers found that losing a match was followed by a peak in cortisol in both men and women, alongside a corresponding drop in testosterone, with the percentage size of these hormonal shifts being consistent across men and women [2].

The functional consequences of this shift go beyond the moment of defeat. In one study of 64 men who competed in rigged one-on-one contests, those whose testosterone rose after losing were more willing to compete again against the same opponent than those whose testosterone continued to fall — meaning the hormonal aftermath of a loss doesn’t just reflect the outcome, it appears to shape a participant’s willingness to re-engage with the next contest, at least in this male laboratory sample [3]. This offers one possible physiological correlate of something coaches have long observed anecdotally in athletes: some seem to bounce back quickly after a loss, while others carry it into their next performance — though the study itself did not test athletes or measure sport performance.

I have seen a similar pattern outside sport as well. In clinical practice, some patients describe reacting to major setbacks in much the same way athletes react to defeat: for some, confidence collapses and the next step feels harder; others become more determined and want to try again almost immediately.

I have also watched this contrast closely among fellow athletes and national-team competitors over the years. Broadly speaking, people often seem to move in one of two directions after a loss. Some withdraw and begin to doubt themselves, while others appear energized by the setback, as if the unfinished business itself creates a strong desire to return and compete again.

In my view, this difference may reflect resilience and the way an individual interprets failure. Hormonal responses may be one part of that picture, but they are unlikely to explain it on their own. Personality, previous experiences, confidence, support, and the meaning attached to the loss may all shape whether defeat becomes discouraging or motivating.

Losing Streaks in Combat Sports: The Direct Evidence

Most winner–loser effect research has been conducted outside combat sports, but one study used bronze-medal contests in professional judo as a natural experiment. One athlete entered the contest after losing a semifinal, whereas the other entered after winning a repechage match, creating a contrast between a recent defeat and a recent victory. Using data from major international tournaments between 2009 and 2013, the researchers found that psychological momentum significantly affected men’s performance, whereas no corresponding effect was detected in women [7].

The authors noted that this sex difference was consistent with previous testosterone research. However, the judo study did not measure hormones, so testosterone remains a proposed interpretation rather than a directly tested mechanism [7].

This finding is relevant to discussions of short-term momentum in combat sports, particularly when bouts occur close together in the same tournament — but whether a similar effect persists across the months or years separating professional fights, as in the Silva or McGregor examples, remains unknown from this data alone.

I also suspect that the same basic pattern may extend beyond sport, although this is an interpretation rather than something the judo study itself proves. We often treat athletic competition as separate from ordinary life, but the underlying human responses to challenge, criticism, failure, and recovery are not confined to the sporting arena.

In clinical practice, I sometimes see patients react to setbacks in ways that resemble the contrast seen after competition. A difficult review at work, criticism from a supervisor, or a perceived failure can leave one person discouraged and hesitant to re-engage, while another becomes more determined to recover and try again. The situation is not identical to losing a fight, and I would not reduce these reactions to hormones alone, but the broader pattern can feel familiar.

My own competitive background has shaped how I think about this. Sport taught me that defeat does not need to become an identity. A loss can be acknowledged, examined, and used as material for growth rather than accepted as proof that future failure is inevitable. In my view, this is the most useful way to apply the loser-effect literature to everyday life: not as evidence that we are trapped by our physiology, but as a reminder that our first reaction to defeat is only one part of what happens next. How we interpret the setback, recover from it, and choose to respond may still matter greatly.

Fear, Injury, and the Compounding Effect

A separate strand of research helps explain why a single bad loss — particularly one involving injury, such as Silva’s leg fracture against Chris Weidman, or a knockout loss in striking-based sports — can have an outsized effect on subsequent performance and contribute to a losing streak. Studies of athletes returning to sport after injury consistently find that athletes who are more apprehensive about returning to play show stronger fear-avoidance behaviors, that this fear can persist even when an athlete is physically cleared to compete again, and that it is associated with decreased performance and altered movement patterns upon return [9]. In other words, a loss that also carries physical trauma compounds two separate mechanisms — the hormonal loser effect and injury-related fear avoidance — rather than one.

From a clinical perspective, this also seems intuitively understandable. When a serious injury occurs during competition, the body and brain may begin to interpret similar situations as unusually threatening. If a previous contest resulted in genuine physical trauma, it is not difficult to imagine why future exposure to a similar situation might trigger greater caution or hesitation, even after the injury itself has healed.

I sometimes think of this as the mind’s attempt to protect the body from experiencing the same trauma twice. That interpretation fits well with the fear-avoidance literature, although it remains a clinical way of thinking about the problem rather than a mechanism directly demonstrated by the studies discussed here. In practice, this may help explain why physical recovery and psychological readiness do not always progress at the same pace.

The Psychological Mechanism: Self-Efficacy

Alongside the hormonal findings, self-efficacy offers a possible psychological pathway. Self-efficacy refers to an athlete’s belief in their ability to execute a particular task successfully. A recent systematic review and meta-analysis linked self-efficacy with performance-related outcomes in high-performance sport and identified interventions intended to strengthen it, although much of the available literature was descriptive or correlational [10]. According to Bandura’s self-efficacy theory, mastery experiences are generally considered the most influential source of efficacy beliefs [13].

This offers a second, non-hormonal pathway to the same outcome: even an athlete with unchanged skill and unchanged hormones may perform worse simply because their confidence and expectation of success has dropped — a pattern that can compound across a losing streak in sports independent of any hormonal shift.

I have noticed a similar pattern in both clinical work and everyday life. Constructive feedback is usually intended to improve performance, but it can have the opposite effect if a person interprets criticism of one task as proof of broader incompetence. In that situation, confidence may fall and development becomes harder.

My own background in competitive sport taught me to view feedback differently: not as a verdict, but as information about what can still be improved. In my view, this distinction is central to self-efficacy. The same setback can either weaken confidence or become part of growth, depending partly on how it is interpreted.

Is the Effect Universal? What the Momentum Literature Adds

Related research on psychological momentum also shows that prior-performance effects are not uniform across sports or study designs. An analysis of 2,083 identified momentum occurrences across 372 professional basketball games found that momentum occurrences were significantly more frequent among winning teams than losing teams [11]. However, because momentum was defined from short-term changes in the score, this association does not by itself establish that psychological momentum caused the final result.

A study of club golfers illustrates the methodological difficulty more directly. The authors noted that identifying a causal relationship between psychological momentum and subsequent performance requires accounting for player ability, situational context, strategic effects, and the positive autocorrelation of consecutive scores [12]. They nevertheless found evidence of a cold-hand effect in both men and women and a hot-hand effect in men only [12].

Together, these findings suggest that momentum-related patterns can be measured, but their direction, magnitude, and interpretation depend on the sport, the study design, and the way momentum is defined.

You Don’t Have to Become a Self-Fulfilling Prophecy

One of the most important lessons I learned from competitive sport is that a setback does not have to become a prediction of what comes next. Defeats, mistakes, and disappointments are inevitable. The question is not whether they happen, but how we choose to interpret them.

In my view, failure is an essential part of learning rather than evidence that learning has failed. If we cannot identify our mistakes, it becomes difficult to improve. During my own competitive career, I made a habit of recording my fights and many of my training sessions, then reviewing them specifically to look for weaknesses. The goal was never to confirm that I was good enough. It was to find the next thing I could do better.

I think this mindset also protects against the downward spiral described throughout this article. A loss can become a self-fulfilling prophecy if it is interpreted as proof of permanent inadequacy. But it can also become valuable information. Every defeat contains feedback about what worked, what did not, and where the next opportunity for improvement lies.

This principle extends well beyond sport. Whether the setback comes from work, relationships, or everyday life, it may help to view it as information rather than a verdict on your worth or ability. None of us begins as a finished product, and genuine competence rarely develops from reading alone. It grows through experience, correction, repetition, and, inevitably, occasional failure. In that sense, setbacks are not simply obstacles on the path to improvement—they are often part of the path itself.

Conclusion: Losing Streaks in Sports

Losing streaks are rarely explained by a single factor. The research reviewed here suggests that defeat can trigger measurable physiological and psychological responses, but those responses are neither uniform nor inevitable. Hormonal changes, self-efficacy, fear of reinjury, personality, previous experiences, and the meaning an individual assigns to a setback may all influence what happens next. The loser effect is therefore best understood as one piece of a much larger picture rather than a complete explanation for why athletes, or people more broadly, struggle after failure.

What I find most valuable about this literature is not the idea that biology determines our future, but that it helps explain why setbacks can feel so powerful in the moment. Understanding that these reactions have both psychological and physiological components may make them easier to recognize without accepting them as permanent. Our initial response to defeat is not necessarily the same as our long-term trajectory.

From my own years in competitive sport, the athletes who developed the most were not the ones who avoided failure, but the ones who learned to use it. Looking back, many of my biggest improvements came from carefully reviewing defeats rather than celebrating victories. Every loss became feedback: information about what needed to change, not a statement about who I was.

I think the same principle extends well beyond sport. None of us becomes competent without making mistakes, receiving criticism, and discovering our own weaknesses. Whether the setback comes from competition, work, relationships, or everyday life, the challenge is the same: to treat failure as information rather than identity. That may be one of the most practical lessons to take from the loser-effect literature. We may not always control our first reaction to defeat, but we retain considerable influence over what we choose to do with it next.

References

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6. https://pmc.ncbi.nlm.nih.gov/articles/PMC11107846/
7. https://doi.org/10.1016/j.jebo.2017.01.009
8. https://www.sciencedirect.com/science/article/abs/pii/S0003347223002725
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