[Effect of extremely low frequency magnetic field on brain response to selective mental arithmetic under simulated weightlessness].

{
  "study_type": "other",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.005,
    "sar_wkg": null,
    "duration": null
  },
  "population": "40 normal subjects (20–25 yrs)",
  "sample_size": 40,
  "outcomes": [
    "Brain event-related potentials (ERPs) during selective mental arithmetic task",
    "Amplitude of slow positive potentials related to mental arithmetic activity"
  ],
  "main_findings": "During simulated weightlessness (head-down tilt -10°), the amplitude of slow positive potentials decreased significantly, especially at 100 min after HDT. This decrease was not significant after 5 Hz extremely low frequency magnetic field stimulation.",
  "effect_direction": "benefit",
  "limitations": [
    "Exposure duration and magnetic field intensity were not reported in the abstract.",
    "Study design details (e.g., randomization, blinding, control/sham condition) were not described in the abstract.",
    "Outcome reporting is limited to ERP amplitude changes; clinical or functional performance outcomes were not reported."
  ],
  "evidence_strength": "low",
  "confidence": 0.66,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low frequency magnetic field",
    "ELMF",
    "5 Hz",
    "event-related potentials",
    "ERP",
    "mental arithmetic",
    "simulated weightlessness",
    "head-down tilt"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Study context is space medicine/simulated weightlessness, potentially relevant to occupational settings, though not explicitly stated."
    }
  ]
}