Resistance Training and Mental Health: Depression and Anxiety

In 2018, Gordon et al. published a JAMA Psychiatry meta-analysis of 33 randomized controlled trials involving 1,877 participants that established resistance training as an evidence-based intervention for depression, with an overall effect size of -0.66 (moderate-to-large) regardless of training volume, intensity, or program duration. The finding received widespread attention—yet the practical implications for programming are frequently overlooked in favor of the headline number. Which intensities work best? Does the mental health benefit require heavy loading, or does low-intensity resistance work produce equivalent effects? How do these findings apply to competitive athletes managing training stress alongside daily life?

This review unpacks the meta-analytic evidence, explains the biological mechanisms, and translates findings into actionable programming guidance for athletes, coaches, and practitioners.

Meta-Analysis Findings: Effect Sizes for Depression and Anxiety

The current meta-analytic literature on resistance training and mental health spans three major reviews published between 2017 and 2022:

An effect size of -0.66 for depression is clinically meaningful—equivalent to the effect magnitude reported for antidepressant medication versus placebo in moderate depression (Cipriani et al., 2018). Crucially, the Gordon et al. analysis found that the effect held across all training volumes and intensities examined, suggesting the benefit is not narrowly dependent on specific programming parameters.

Biological Mechanisms

Multiple converging pathways explain resistance training's antidepressant and anxiolytic effects:

• BDNF upregulation: Brain-derived neurotrophic factor (BDNF) promotes neurogenesis in the hippocampus—a brain region consistently reduced in volume in individuals with major depressive disorder. Resistance training acutely raises serum BDNF by 20-35% post-session (Liu and Nusslock, 2018). Chronic exercise-induced BDNF elevation mirrors the mechanism of several antidepressant medications that increase hippocampal BDNF signaling.
• HPA axis regulation: Chronic psychological stress dysregulates the hypothalamic-pituitary-adrenal axis, causing elevated baseline cortisol and blunted stress reactivity. Regular resistance training reduces basal cortisol, improves cortisol awakening response, and normalizes stress reactivity—changes that persist beyond individual training sessions (Tsatsoulis and Fountoulakis, 2006).
• Endogenous opioid and endocannabinoid release: Resistance training acutely elevates beta-endorphin and anandamide, with the latter now considered a primary mediator of exercise-induced mood improvement rather than the popularized but less supported endorphin hypothesis (Raichlen et al., 2012).
• Self-efficacy and mastery experience: Objective strength progression—measurable, concrete improvement—provides a sense of mastery that counters the learned helplessness model of depression. This psychological mechanism is distinct from the neurochemical pathways and may explain why resistance training has larger effect sizes than equivalent aerobic exercise in some populations.

Dose-Response: Volume, Intensity, and Frequency

The Gordon et al. (2018) analysis examined dose-response relationships across training variables and found a pattern that differs from what the hypertrophy and strength literature would predict:

• Volume: Lower volume programs (fewer than 10 sets per session) produced larger effects on depression (SMD -0.72) than higher volume programs (SMD -0.52). Excessive training volume may counterproductively increase cortisol and fatigue, blunting the psychological benefit.
• Intensity: Both low-to-moderate (50-69% 1RM) and high-intensity (70%+ 1RM) programs produced significant antidepressant effects. The analysis did not find a significant intensity-effect relationship, suggesting the psychological benefit is not mechanically dependent on high loads.
• Frequency: 2-3 sessions per week produced the largest effects; beyond 3 sessions per week, diminishing returns appeared and in some high-volume programs effects weakened. Weekly volume appears to be a critical variable—enough to generate the neurotrophic and hormonal response, not so much as to create a cumulative stress burden that counteracts the benefit.

Practical implication: a 2-3x/week program of 20-30 minutes focused on compound movements at moderate intensity (60-75% 1RM) represents the minimum effective dose for mental health outcomes and is achievable within almost any athlete's schedule.

Resistance Training vs. Aerobic Exercise for Mental Health

Aerobic exercise has a substantially larger evidence base for mental health than resistance training—decades of research versus roughly 15 years of well-controlled resistance training studies—but head-to-head comparisons suggest the two modalities are more similar than different:

• Schuch et al. (2016) meta-analysis found no significant difference in depression effect sizes between aerobic and resistance training when controlling for study design quality.
• A 2020 network meta-analysis by Recchia et al. found resistance training and aerobic training produced equivalent anxiety reductions, with combination training providing additive benefits.
• The mechanisms differ: aerobic exercise primarily drives BDNF through VEGF-mediated hippocampal vasculogenesis; resistance training drives BDNF through mechanical and hormonal pathways and adds the self-efficacy mechanism that aerobic exercise lacks.

For athletes who already perform substantial aerobic conditioning—endurance athletes, team sport players—resistance training provides mental health benefits through mechanisms that aerobic work cannot replicate, making the combination genuinely additive rather than redundant.

Athlete-Specific Findings

Most depression and anxiety research on resistance training uses general population or clinical samples. Athlete-specific evidence is more limited but raises important points:

Overtraining and mental health reversal: While moderate resistance training reduces depression and anxiety, excessive training load produces the opposite effect. Kreher and Schwartz (2012) documented that athletes experiencing overtraining syndrome show depression rates 2-3× higher than matched athletes training at appropriate volumes—demonstrating a clear dose-response inversion. The beneficial range for athletes appears narrower than for sedentary individuals.

Performance anxiety: Resistance training's anxiolytic effects apply to general trait anxiety, but the evidence for sport-specific performance anxiety reduction is more limited. Competitive athletes may require psychological skills training (visualization, arousal regulation) in addition to training load management to address performance anxiety specifically.

Injury and mental health: Athletes sustaining serious injury show depression rates of 18-32% in prospective studies (Appaneal et al., 2009). Maintaining some form of structured resistance training during rehabilitation—including low-load or BFR work—may provide meaningful psychological benefit in addition to physical rehabilitation gains.

Programming for Mental Health Outcomes

Evidence-informed programming recommendations for athletes seeking to maximize mental health benefits alongside physical performance:

• Maintain 2-3 resistance sessions per week year-round: Mental health benefits appear to require continuity—benefits diminish within 2-4 weeks of cessation. In-season programs that compress to 1 session per week may be insufficient for sustained psychological benefit.
• Include movement variety: Psychological engagement is higher with varied movement selection. Monotonous single-exercise programs show weaker effect sizes in some analyses, possibly due to reduced attentional engagement and novelty-driven dopamine response.
• Monitor training load relative to recovery: Use subjective wellbeing scales (POMS, Brief Mood Introspection Scale) or objective readiness measures weekly. Rising scores on fatigue, depression, and confusion subscales alongside declining performance are early overtraining indicators requiring immediate volume reduction.
• Ensure demonstrable progress: The self-efficacy pathway requires concrete evidence of improvement. Tracking velocity or strength metrics that show objective progression—rather than training for maintenance only—maximizes this mechanism.

How Objective Performance Feedback Enhances Psychological Outcomes

Velocity-based training introduces an underappreciated psychological benefit beyond its physical optimization function: immediate objective feedback creates a clear performance-outcome link that strengthens intrinsic motivation and mastery experience—two constructs directly linked to positive affect in self-determination theory (Deci and Ryan, 2000).

Weakley et al. (2019) studied the motivational effects of velocity feedback in a training context and found that athletes provided with real-time velocity data not only performed 9-12% better acutely but reported significantly higher session enjoyment and sense of competence compared to athletes training without feedback. Over a 6-week period, the feedback group reported more positive affect and greater training adherence.

For athletes managing mental health challenges, the combination of: (1) physiological mechanisms from the training stimulus itself, and (2) motivational enhancement from objective performance feedback may produce compounding psychological benefits that neither element achieves alone. This is a practical advantage of instrument-augmented training that traditional programming cannot fully replicate.