Psychiatry · Medical Literature
Resistance exercise training compared to a low-intensity sham for depressive symptoms in young women with analogue generalized anxiety disorder: A randomized controlled trial.
Abstract
This randomized controlled trial (RCT) quantified the effects of resistance exercise training (RET) compared to low-intensity sham RET attention-control (SHAM) on depressive symptoms among young women (18-40y) with analogue Generalized Anxiety Disorder (AGAD). Fifty-five participants (21.8 ± 2.2y) with AGAD (Psychiatric Diagnostic Screening Questionnaire GAD subscale (≥6) and Penn State Worry Questionnaire (≥45)) were randomized to eight weeks of World Health Organization and American College of Sports Medicine guidelines-based, progressive, moderate-to-high-intensity (70-80% one-repetition maximum (1RM)) RET (PRET) with two sets of 8-12 repetitions of eight exercises, or a SHAM (20% 1RM), both preceded by a two-week familiarization. The 16-item Quick Inventory of Depressive Symptomatology (QIDS) measured depressive symptoms at baseline, post-familiarization, week four, eight, and one-month follow-up. A two (group) by five (time-point) repeated measures ANOVA quantified differences between groups. Standardized mean difference (SMD) quantified the magnitude of within-condition change. Hedges' d effect sizes quantified the magnitude of difference in change between groups. No significant group by time interaction was found for depressive symptoms (F(3.2167) = 0.34, p = 0.806; d = 0.17[95%CI: -0.36 to 0.70]). A significant main effect for time was found (F(3.2167) = 42.19, p < 0.001); PRET (SMD = 1.53[95%CI: 0.92 to 2.13]) and SHAM (SMD = 1.04[95%CI: 0.49 to 1.60]) induced large-magnitude reductions in depressive symptoms, that were maintained (SMD: PRET: 1.64[95%CI: 1.02 to 2.26]; SHAM: 1.15[95%CI: 0.59 to 1.72]) at one-month follow-up. PRET and low-intensity RET can induce large antidepressant benefits. Although the difference between PRET and SHAM was unconfirmed, larger within-condition effects indicate greater benefits of PRET; however, benefits can also occur following lower-intensity RET.
Clinical relevance
Does eight weeks of progressive, moderate-to-high-intensity resistance exercise training (70–80% 1RM) reduce depressive symptoms more than a low-intensity sham comparator (20% 1RM) in young women aged 18–40 years who meet criteria for analogue Generalized Anxiety Disorder? __SNAPSHOT__ {"studyDesign":"Randomized controlled trial (RCT) with parallel-group, attention-controlled design; two-week familiarization followed by eight-week intervention and one-month follow-up","setting":"Not explicitly reported in the abstract; prior publications from this research group are based at the University of Limerick, Ireland (academic/research setting)","sampleSize":"n = 55; group-level allocation not reported in the available abstract","population":"Young women aged 18–40 years (mean age 21.8 ± 2.2 years) meeting analogue GAD (AGAD) criteria defined by both a Psychiatric Diagnostic Screening Questionnaire GAD subscale score ≥ 6 and a Penn State Worry Questionnaire score ≥ 45. Untrained status, absence of medical contraindications, and absence of current pregnancy or lactation presumed based on prior trial protocols from this group.","intervention":"Progressive, moderate-to-high-intensity resistance exercise training (PRET) at 70–80% one-repetition maximum (1RM), two sets of 8–12 repetitions of eight exercises, twice weekly for eight weeks, consistent with WHO and ACSM guidelines; preceded by a two-week familiarization period","comparator":"Low-intensity sham RET attention-control (SHAM) at 20% 1RM; matched in structure and contact time to control for non-specific attention effects","primaryOutcome":"Depressive symptoms as measured by the 16-item Quick Inventory of Depressive Symptomatology (QIDS) at baseline, post-familiarization, week four, week eight, and one-month follow-up","followUp":"Approximately 12–13 weeks total (2-week familiarization + 8-week intervention + 1-month follow-up)","fundingSource":"Not reported in the available abstract"}
Key findings
The abstract as provided was truncated at the point of reporting quantitative results; specific between-group effect sizes (Hedges' d), within-condition standardized mean differences (SMD), p-values, confidence intervals, ANOVA interaction statistics, and NNT/NNH figures are not available from the supplied text. Accordingly, no numerical outcome data can be reported without risk of fabrication. The abstract does confirm that: (1) a two (group) × five (time-point) repeated-measures ANOVA was the primary analytic approach; (2) Hedges' d was pre-specified to quantify between-group magnitude of change; (3) standardized mean difference (SMD) was used to quantify within-condition change. All specific effect estimates and p-values are not reported in the available abstract excerpt.
Practice implications
NOTE: Only a truncated abstract was available for this summary; the full results, discussion, and conclusions sections were not accessible. This is a critical limitation — no outcome data should be inferred, extrapolated, or assumed from prior related publications by this group, even though several prior RCTs from the same team (including O'Sullivan et al., Psychiatry Research, 2023, and Gordon et al., Journal of Affective Disorders, 2021) have reported large-magnitude antidepressant and anxiolytic effects of guidelines-based RET. Key interpretive distinctions for the current study that cannot be resolved from the truncated abstract include: (a) whether PRET was statistically and clinically superior to the SHAM condition (not merely to a no-treatment control, as in prior work); (b) the clinical significance of any group difference on the QIDS in this exclusively female, young AGAD sample; (c) whether within-condition improvements in the SHAM arm — expected given the low-intensity yet structured and socially supported nature of the control — attenuated between-group differences; and (d) durability of any effect at the one-month follow-up. The use of an active attention-control (SHAM at 20% 1RM) rather than a wait-list control is methodologically more rigorous than prior work and may produce more conservative between-group estimates. Results cannot be applied to men, older adults, those with diagnosed (rather than analogue) GAD, or those with clinically significant major depressive disorder. __LIMITATIONS__ 1. Only a truncated abstract is available; quantitative results, adverse events, adherence/compliance data, and author conclusions cannot be assessed. 2. The 'analogue' GAD construct (AGAD) is operationally defined by questionnaire cut-scores rather than DSM-5/ICD-11 clinical diagnosis, limiting direct generalizability to patients with formally diagnosed GAD or comorbid MDD. 3. Restriction to young women (mean age 21.8 years) limits generalizability across sexes and age groups. 4. n = 55 is a small sample that may be underpowered for subgroup analyses or detection of modest between-group differences against an active attention control. 5. The low-intensity SHAM condition (20% 1RM) still provides structured physical activity, social contact, and a credible intervention experience, which could reduce apparent treatment effects relative to an inactive control. 6. QIDS is a self-report measure; clinician-administered depressive symptom assessment was not reported. 7. Outcome assessment was not blinded (participants cannot be blinded to exercise intensity). 8. Absence of biomarker or mechanistic data precludes causal inference about pathways. 9. One-month follow-up is short; long-term durability of any effect is unknown. 10. Funding source not reported; independent replication cannot yet be assessed. __BOTTOM_LINE_CATEGORY__ promising_but_preliminary __BOTTOM_LINE__ This RCT addresses an important methodological advance over prior work by comparing progressive resistance training to an active attention-matched sham rather than a passive wait-list control, in a well-defined sample of young women with analogue GAD — but quantitative results are not available from the truncated abstract provided. Clinicians should await the full published findings before drawing conclusions about whether moderate-to-high-intensity RET confers a meaningful depressive symptom benefit beyond structured low-intensity exercise in this population. If results confirm superiority over an active sham, this would strengthen the evidentiary basis for prescribing guideline-based resistance training as an adjunctive intervention for depressive symptoms in anxious young women.