Parkinson’s disease (PD) is an increasingly prevalent neurodegenerative disorder with motor and non-motor manifestations that impair function and quality of life. Exercise and structured physical activity are recognized as promising non-pharmacological strategies to improve motor symptoms and to potentially influence disease-related pathways such as neuroplasticity and neuroinflammation. Dual-task training that simultaneously challenges motor and cognitive systems has been proposed to yield additional gains in gait, balance, and selected cognitive domains versus single-domain motor training. The PARKEX trial was designed to evaluate clinical and functional effects of two exercise approaches in early-stage PD while the primary mechanistic endpoint focused on mitochondrial function.
PARKEX was a randomized controlled clinical trial (ClinicalTrials.gov NCT05963425). The excerpt reports that 24 participants with idiopathic PD were allocated to one of three arms: Basic Physical Training (BPT), BPT combined with Functional Exercises (BPT + FE, dual-task), or a no-intervention control group (Con). Interventions were implemented over a 12-week period. The source did not provide additional demographic or baseline characteristic details in the supplied text.
Active interventions lasted 12 weeks with three sessions per week, each session lasting 60 minutes. One arm received Basic Physical Training (BPT), and the second received BPT plus Functional Exercises (BPT + FE) designed to incorporate dual-task components. The specific content, progression, and examples of exercises used in BPT and BPT + FE were not fully described in the available article excerpt.
Clinical and functional outcomes prospectively collected included health-related quality of life measured by the PDQ-39, depressive symptoms assessed by the Beck Depression Inventory (BDI), lower-limb strength via the 1-minute Sit-to-Stand Test (STS), and functional mobility via the Timed Up and Go (TUG) test. The trial’s primary biological endpoint (mitochondrial function) is mentioned as the original primary outcome, but mechanistic results are outside the scope of the provided text.
Between-group effects were analyzed using a permutation-based ANOVA with Bonferroni correction. Effect sizes for patient-reported outcomes were reported using rank-biserial correlation (r_rb) for some comparisons. Full statistical tables and additional analyses are referenced in figures and tables available in the full article, but only key group comparisons and p-values are provided in the supplied summary.
Both active exercise programs produced statistically significant improvements in objective physical performance versus the control group.
1-minute Sit-to-Stand (STS): BPT vs. control showed a mean difference (MD) of 31.00 (p = 0.0026). BPT + FE vs. control showed MD = 19.00 (p = 0.0026).
Timed Up and Go (TUG): BPT vs. control improved by MD = −2.07 seconds (p = 0.0039). BPT + FE vs. control improved by MD = −2.43 seconds (p = 0.0028).
These comparisons indicate clinically measurable gains in lower-limb strength and functional mobility after 12 weeks of supervised exercise relative to no intervention.
Between-group differences in overall PDQ-39 and BDI scores did not reach statistical significance (reported rank-biserial correlations r_rb = −0.339 for PDQ-39 and r_rb = −0.429 for BDI). However, the authors report medium effect sizes on specific PDQ-39 subscales and selected psychosocial domains, which may reflect potentially meaningful trends:
These patterns suggest possible benefits for aspects of quality of life and perceived discomfort that were not statistically significant in this sample and require confirmation in larger studies.
In this small randomized sample, both BPT and BPT + FE yielded significant improvements in objective measures of physical performance compared with no intervention over 12 weeks of training. Improvements in STS and TUG indicate gains in lower-limb function and mobility that are relevant to daily activities and fall risk mitigation in PD. Although overall patient-reported quality-of-life and depressive symptom scores did not change significantly between groups, the medium-sized effects on subscales point to possible psychosocial benefits that merit further investigation.
These findings support the inclusion of structured exercise programs in early PD management and suggest that both basic and dual-task formats can produce functional gains. The trial’s original focus on mitochondrial outcomes highlights an integrated approach linking mechanistic research with clinical function, but mechanistic results are not reported in the provided excerpt.
The provided source excerpt leaves several methodological and contextual details unspecified. The following items were not reported in the available text and therefore cannot be asserted here:
These omissions limit interpretation of generalizability, dose–response relationships, and safety.
The PARKEX randomized trial found that both Basic Physical Training and Basic Training combined with Functional Exercises produced significant improvements in lower-limb performance (STS) and mobility (TUG) compared with a no-intervention control after 12 weeks in a sample of people with idiopathic PD. Patient-reported quality of life and depressive symptoms did not show statistically significant between-group changes, though some subscales had medium effect sizes suggestive of potential benefits. The authors conclude that structured exercise programs can improve physical performance in PD, and that observed psychosocial trends warrant confirmation in larger, more fully described trials. Trial registration: ClinicalTrials.gov NCT05963425. The dataset supporting the findings is available in the Zenodo repository cited in the source.