Priority research notes.

PRIMARY ABSTRACT APPRAISAL

Does extending short sleep improve energy balance in adults with overweight?

A small randomized trial supports a short-term effect on food-energy intake in habitual short sleepers. It does not establish sustained weight loss or diabetes prevention. The useful research question is whether a sleep intervention changes durable clinical outcomes, rather than assuming that extra time in bed produces a fixed daily calorie saving.

• Among 80 adults aged 21–40 with overweight and habitual sleep under 6.5 hours, a two-week intervention increased sleep by about 1.2 hours nightly relative to control.
• Objectively estimated energy intake fell by about 270 kcal/day versus control; the 95% confidence interval ranged from 147 to 393 kcal/day lower. Total energy expenditure did not significantly differ.
• Single-center, short-duration study in a selected population; the estimate is not a personal calorie target.
• Energy intake was estimated from expenditure and changes in energy stores, not direct recording of everything consumed.

Sources and correction checks

1. Effect of Sleep Extension on Objectively Assessed Energy Intake Among Adults With Overweight in Real-life Settings: A Randomized Clinical Trial · PMID 35129580

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review longer trials, adherence, obesity outcomes and the complete intervention/safety protocol before a broader clinical conclusion.

PRIMARY ABSTRACT APPRAISAL

How do CBT-I and medication differ in acute and lasting insomnia outcomes?

The available comparisons support CBT-I as an important durable treatment, while medication can add short-term benefits for some outcomes. They do not establish that every hypnotic is equivalent or that medication can be stopped without clinical supervision. Acute response and remission after treatment ends must be evaluated separately.

• A 160-participant randomized trial found improvements with CBT alone and CBT plus zolpidem; acute responder and remission proportions were similar, while combined treatment increased sleep time more.
• A 13-trial network meta-analysis found a longer-term sleep benefit for CBT-I versus control. Temazepam, the only medication represented in that review, showed short-term benefit but no demonstrated long-term advantage over control.
• The direct trial compared CBT with combined treatment, not CBT against medication alone.
• The long-term review cannot establish effects for all sedative classes, and network comparisons include indirect evidence.

Sources and correction checks

1. Cognitive behavioral therapy, singly and combined with medication, for persistent insomnia: a randomized controlled trial · PMID 19454639

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

2. Effectiveness of Exercise, Cognitive Behavioral Therapy, and Pharmacotherapy on Improving Sleep in Adults with Chronic Insomnia: A Systematic Review and Network Meta-Analysis of Randomized Controlled Trials · PMID 37570447

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review the complete risk-of-bias assessments, medication-specific harms, newer drug trials and guideline recommendations.

PRIMARY ABSTRACT APPRAISAL

Does aerobic exercise lower resting blood pressure?

Randomized exercise evidence supports a reduction in resting blood pressure, with average effects varying across training modes and populations. The endpoint here is measured blood pressure, not proof that every exercise prescription prevents cardiovascular events. Population averages should not be turned into promised individual responses.

• A 2023 synthesis included 270 randomized trials and 15,827 participants across several exercise modes; eligible interventions lasted at least two weeks.
• In its aerobic-training comparisons, pooled resting systolic and diastolic pressure differences were approximately 4.49 and 2.53 mm Hg lower than non-intervention controls. Other exercise modes also showed reductions.
• The total participant count includes all exercise modes, not only the aerobic subset.
• Network rankings do not by themselves establish an optimal modality for an individual; the abstract does not resolve all heterogeneity, medication use or safety differences.

Sources and correction checks

1. Exercise training and resting blood pressure: a large-scale pairwise and network meta-analysis of randomised controlled trials · PMID 37491419

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Inspect aerobic-subset confidence intervals, baseline hypertension, medication handling, measurement methods and adverse-event reporting in the full paper.

PRIMARY ABSTRACT APPRAISAL

Which resistance-training approaches improve strength in older adults?

Different resistance-training modalities can improve measured strength in community-dwelling older adults. A modality ranking is less secure than the broader finding that training helps relative to doing no training. Evidence about strength should remain distinct from evidence about muscle size, falls, disability or survival.

• A 2025 network meta-analysis of 102 controlled trials and 4,754 older adults reported positive strength effects for machines, free weights, elastic bands, mixed approaches and bodyweight training versus no intervention.
• An older 25-RCT synthesis also found strength gains but smaller changes in muscle morphology, and explicitly reported considerable heterogeneity and weak average methodological quality.
• The 2025 review included controlled trials described as '(randomized)'; do not count every included study as a confirmed RCT.
• Community-dwelling samples do not automatically represent frail or mobility-limited adults. Cross-study rankings can reflect differing loads, supervision and outcome tests.

Sources and correction checks

1. The Effects of Different Resistance Training Modalities on Muscle Strength in Community-Dwelling Older Adults: A Network Meta-Analysis · PMID 40452461

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

2. Dose–Response Relationships of Resistance Training in Healthy Old Adults: A Systematic Review and Meta-Analysis · PMID 26420238

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Compare trial quality, direct head-to-head estimates and functional outcomes; update any dose claims using contemporary guidelines.

PRIMARY ABSTRACT APPRAISAL

Does creatine add meaningful benefits to resistance training in older adults?

The more consistent signal is a modest additional strength benefit during resistance training. Muscle-mass and functional claims need more caution because reviews with different eligibility and statistical methods do not give identical answers. Creatine without training is a separate intervention and should not inherit these estimates.

• A 2017 review of 22 trials reported additional lean tissue and strength gains with creatine plus training versus placebo plus training.
• A 2026 three-level meta-analysis of 11 RCTs in adults aged at least 60 found a small strength effect (g 0.31, 95% CI 0.18–0.45), but muscle-mass and physical-function intervals included no effect.
• Differences in age criteria, health status and handling correlated outcomes can change pooled conclusions; the two reviews should not be counted as independent patient cohorts.
• The newer review rated muscle-mass and function evidence low or very low certainty and cautioned against extrapolation to frail adults.

Sources and correction checks

1. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis · PMID 29138605

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

2. Effects of resistance training combined with creatine supplementation on muscle strength, physical function, and muscle mass in older adults: a systematic review and three-level meta-analysis · PMID 42712402

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Audit overlapping studies, absolute functional changes, kidney-risk eligibility and long-term adverse-event ascertainment.

INITIAL ABSTRACT NOTE · UPDATED APPRAISAL LINKED

Does a Mediterranean dietary pattern reduce major cardiovascular events in high-risk adults?

The corrected PREDIMED report concerns high-risk adults. Follow the current full-text catalog appraisal for methods and remaining limits.

• This note and RX0151 share the same trial; they are not independent evidence.

Current full-text catalog appraisal RX0151

Sources and correction checks

1. Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts · PMID 29897866

   Observed: corrected/republication replaces 2013 PMID23432189, which is marked retracted; notice PMID29897867. No comprehensive external correction search completed.

Next verification: Read the current catalog appraisal and its unresolved method, correction and replication checks.

PRIMARY ABSTRACT APPRAISAL

Does time restriction add weight-loss benefit when calorie restriction is already prescribed?

In one year-long randomized trial, adding an early eating window to calorie restriction did not demonstrate superior weight loss. Both groups lost weight. This answers a comparison between two prescribed interventions, rather than proving that eating time never matters or that time restriction is ineffective against unrestricted eating.

• The trial randomized 139 adults with obesity to calorie restriction with or without an 8 a.m.–4 p.m. eating window; 118 completed 12-month follow-up.
• Weight changes were approximately −8.0 versus −6.3 kg. The between-group estimate was −1.8 kg with a 95% CI from −4.0 to 0.4 kg, so superiority was not demonstrated. Metabolic secondary outcomes were broadly consistent.
• A nonsignificant result is not an equivalence test and does not rule out every clinically meaningful difference.
• One window, selected adults with obesity and substantial dietary support do not represent all timing regimens or usual-care conditions.

Sources and correction checks

1. Calorie Restriction with or without Time-Restricted Eating in Weight Loss · PMID 35443107

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review adherence, missing-data handling, prespecified endpoints and newer calorie-matched timing trials.

PRIMARY ABSTRACT APPRAISAL

Can routinely cooling muscles immediately after strength training reduce adaptation?

A small randomized study suggests a trade-off between immediate post-exercise cooling and longer-term strength-training adaptation.

• This short reading note links to the fuller catalog appraisal below. Scope and unresolved checks remain source-specific.

Catalog appraisal RX0106

Sources and correction checks

1. Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training · PMID 26174323

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review later meta-analyses, training volume control, allocation/blinding and whether alternative exposure timing changes the effect.

PRIMARY ABSTRACT APPRAISAL

Does the sauna–cardiovascular mortality association demonstrate causation?

Sauna frequency was associated with cardiovascular mortality in a Finnish cohort, but this design cannot establish that prescribing sauna prevents death. The research priority is to separate a plausible heat-exposure effect from health, social and behavioral differences between frequent and infrequent sauna users.

• The 2018 prospective cohort assessed sauna habits at baseline in 1,688 adults, about half women, and recorded 181 cardiovascular deaths over a median 15 years.
• Higher frequency remained associated with fewer fatal cardiovascular events after multivariable adjustment. The adjusted estimate for two to three versus one weekly session had a confidence interval crossing no association.
• Exposure was not randomized; adjustment cannot eliminate residual confounding, reverse causation or changes in habits after baseline.
• Findings from older Finnish adults do not define a universally safe temperature, duration or frequency, and predictive discrimination is not an intervention effect.

Sources and correction checks

1. Sauna bathing is associated with reduced cardiovascular mortality and improves risk prediction in men and women: a prospective cohort study · PMID 30486813

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review randomized heat-exposure trials, adverse events and causal sensitivity analyses before claiming cardiovascular event prevention.

PRIMARY ABSTRACT APPRAISAL

Does routine vitamin D supplementation prevent fractures in adults not selected for deficiency?

The VITAL fracture study did not find fewer fractures with routine vitamin D supplementation in generally healthy midlife and older adults.

• This short reading note links to the fuller catalog appraisal below. Scope and unresolved checks remain source-specific.

Catalog appraisal RX0501

Sources and correction checks

1. Supplemental Vitamin D and Incident Fractures in Midlife and Older Adults · PMID 35939577

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review baseline-deficiency distributions, subgroup precision, adherence and evidence for clinically selected deficiency or osteoporosis populations.

PRIMARY ABSTRACT APPRAISAL

Does raising NAD with a precursor establish better human function or longevity?

A small nicotinamide-riboside trial showed that the supplement can change NAD metabolism over weeks. Target engagement is a useful mechanistic result, but it does not establish longer life, prevention of disease or sustained functional improvement. Different NAD precursors and patient populations need their own evidence.

• A randomized, double-blind crossover study used two six-week periods in healthy middle-aged and older adults and reported that nicotinamide riboside was tolerated and increased NAD-related metabolism.
• The authors described physiological signals as preliminary and called for further trials of blood pressure and arterial stiffness. The accessible abstract does not establish a durable clinical or mortality benefit.
• Short duration and small sample size limit both efficacy interpretation and detection of uncommon harms.
• Biochemical changes cannot be substituted for patient-important outcomes, and this NR study should not be relabeled evidence about every NMN or NAD product.

Sources and correction checks

1. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults · PMID 29599478

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Review newer NR/NMN trials, multiplicity-adjusted functional outcomes, long-term safety and population-specific results before expanding the claim.

PRIMARY ABSTRACT APPRAISAL

Does continuous glucose monitoring improve important outcomes in people without diabetes?

Evidence in people without diabetes remains distinct from established diabetes-management use. A recent review suggests some short-term feedback and glycemic effects, especially in prediabetes, but does not establish prevention of diabetes or cardiovascular disease in healthy users. A flatter glucose trace is not itself a proven clinical benefit.

• A 2026 review included 23 heterogeneous studies with 1,074 participants; only seven studies were identified as randomized trials.
• Pooled mean glucose improved in the combined nondiabetic evidence, but BMI did not significantly differ. The abstract reported no appreciable glycemic benefit in healthy normoglycemic participants and emphasized accompanying behavioral intervention.
• Mixing healthy people, obesity and prediabetes obscures population-specific effects; observational and intervention studies cannot all support causal estimates.
• Short-term glucose and adherence outcomes do not demonstrate durable weight loss, disease prevention or a favorable balance of costs, distress and dietary restriction.

Sources and correction checks

1. Continuous glucose monitoring in non-diabetic populations: a systematic review of observational and interventional studies with meta-analysis · PMID 41588451

   Not comprehensively screened; absence of a visible notice is not a clean-status certification.

Next verification: Audit which designs enter each pooled estimate, risk of bias, follow-up length, normoglycemic-only trials and patient-important outcomes.