Body position can be monitored in 3D using miniature accelerometers and earth-magnetic field sensors.

Electroencephalography and clinical neurophysiology · 1998 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 4078

The authors developed a wearable 3D orientation monitor combining miniature gravity and earth-magnetic field sensors for long-term ambulatory recordings. Calibration measurements indicated the method was fairly accurate and practically applicable for measurin…

Study snapshot

PublicationElectroencephalography and clinical neurophysiology · 1998

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

OBJECTIVES: The study and diagnosis of movement disorders can be improved by monitoring body position simultaneously with the EMG. METHODS: We developed a monitor of the 3-dimensional (3D) orientation of body parts that can be applied in long-term ambulatory recordings in the daily life of a patient. The 3D sensor combines miniature sensors for earth's gravity and magnetism. It measures 60 x 50 x 10 mm and draws less than 1 mA of current from +/-5 V battery power. The non-horizontal direction of earth magnetism, as well as torque (pronation) of the body part, is corrected mathematically. RESULTS: This results in a measurement of the 3D orientation of a body part in terms of vertical inclination and horizontal azimuth. CONCLUSIONS: Calibration measurements indicate that this method is fairly accurate and practically applicable.

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AI evidence extraction

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Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 66% · Peer reviewed: yes

Main findings

Outcomes measured

3D orientation/body position monitoring (vertical inclination, horizontal azimuth)
Calibration accuracy/practical applicability

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "earth-magnetic field sensors",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "3D orientation/body position monitoring (vertical inclination, horizontal azimuth)",
    "Calibration accuracy/practical applicability"
  ],
  "main_findings": "The authors developed a wearable 3D orientation monitor combining miniature gravity and earth-magnetic field sensors for long-term ambulatory recordings. Calibration measurements indicated the method was fairly accurate and practically applicable for measuring vertical inclination and horizontal azimuth.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.66,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "body position",
    "3D orientation",
    "accelerometers",
    "earth-magnetic field",
    "magnetism sensors",
    "ambulatory monitoring",
    "movement disorders",
    "EMG"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/s0924-980x(98)00053-8
PubMed: 10030679

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