{
  "schema_version": 1,
  "id": "hourly-microexercise-workplace-watch-2026",
  "canonical_url": "https://brali-lifeos.github.io/evidence/hourly-microexercise-workplace-watch-2026/",
  "json_url": "https://brali-lifeos.github.io/evidence/hourly-microexercise-workplace-watch-2026/index.json",
  "decision": "watch",
  "decision_label": "Watch, do not prescribe",
  "reviewed_at": "2026-08-30",
  "reviewed_by": "Brali Evidence Reviewer",
  "source": {
    "title": "Micro-exercise breaks every hour: a feasible strategy to improve metabolic health in sedentary office workers",
    "url": "https://link.springer.com/article/10.1186/s12889-026-26484-4",
    "type": "primary-study",
    "doi": "10.1186/s12889-026-26484-4",
    "citation_text": "Fang Y, Li H, Dong P, Wan F. BMC Public Health. 2026;26:763.",
    "study_design": "Twelve-week individually randomized controlled workplace trial. Eighty-six sedentary office workers were allocated 1:1 to an hourly micro-exercise routine or usual behavior. Allocation used computer-generated permuted blocks with sex/workplace stratification and concealed envelopes; outcome assessors and laboratory staff were blinded. Seventy-nine participants completed 12-week follow-up, and analyses were reported as intention-to-treat.",
    "population": "Sedentary office workers aged 25-55 from three institutions in Nanchang, China, sitting more than six hours per workday and reporting less than 150 minutes of moderate-to-vigorous activity per week. Mean BMI was about 28.5 kg/m² and 40.5% met the study's fasting-glucose criterion for prediabetes.",
    "intervention_or_exposure": "Seven 3-minute equipment-free micro-exercise breaks across an eight-hour workday, using marching, desk/wall push-ups, squats, heel raises, shoulder/arm movements and torso twists, compared with usual behavior.",
    "outcomes": [
      "Fasting blood glucose",
      "Two-hour postprandial glucose",
      "HOMA-IR",
      "Anthropometric and blood-pressure measures",
      "Lipid profile",
      "Accelerometer-measured activity and sedentary time",
      "Adherence and adverse events"
    ]
  },
  "supported_claim": "This trial makes the general movement-break idea more plausible in an ordinary workplace over twelve weeks: a simple hourly bodyweight routine was feasible for many participants, increased light activity, reduced sedentary time and improved several measured metabolic markers. It is useful ecological support for continuing to develop a sitting-interruption protocol, but it should remain watch-level evidence for the exact hourly three-minute dose until stronger preregistered and replicated field evidence is available.",
  "unsupported_or_overstated_claims": [
    "Three minutes every hour is an established optimal dose.",
    "The intervention prevents or delays diabetes or cardiovascular disease.",
    "The results generalize unchanged to normal-weight, highly active, older, younger, shift-working, disabled, or non-office populations.",
    "The routine improves work productivity or cognitive performance; those outcomes were not established with the same objective causal standard.",
    "All seven prescribed breaks are necessary to obtain benefit.",
    "The specific six-exercise sequence is superior to walking or other feasible movement.",
    "The study proves long-term adherence or safety beyond twelve weeks."
  ],
  "limitations": [
    "The trial was not registered in a clinical-trial registry, which weakens confidence that outcomes and analyses were fixed prospectively.",
    "It was a single-city study across three workplaces with only 86 randomized participants and 79 completing follow-up.",
    "The sample was predominantly overweight, limiting generalizability to metabolically different populations.",
    "Participants and intervention facilitators could not be blinded and there was no attention-control condition.",
    "Adherence was monitored primarily by self-report, although workplace observations and accelerometry provided partial objective corroboration.",
    "Dietary intake was not measured, leaving a potential unmeasured contributor to metabolic change.",
    "Twelve weeks is too short to establish durable adherence or clinical endpoints such as diabetes incidence.",
    "The sample was not powered to establish reliable subgroup effects."
  ],
  "target_hack_ids": [
    "break-up-prolonged-sitting"
  ],
  "target_protocol_ids": [
    "brali:break-up-prolonged-sitting"
  ],
  "risk_flags": [
    "health"
  ],
  "notes": "Evidence role: ecological support and dose-boundary watch. Do not promote the exact hourly three-minute routine to canonical Brali guidance from this trial alone. If later preregistered field trials converge, revisit frequency and implementation details."
}