Evidence map›Paper›PMID 42451392›Full record

ArticleSensors (Basel, Switzerland)2026

Multivariate Spectral Analysis of Transabdominally Recorded Intrauterine Acoustic Signals (TRIAS) Across Gestation.

Ryo Tamaki, Fuyuka Igarashi, Ryutaro Yamamoto, Hiroshi Asano, Akira Oku, Keiichiroh Akabane, Kiwamu Noshiro, Ami Hosokawa, Yoshihiro Saito, Hidemichi Watari and 1 more

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Sensors (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors.

Ryo TamakiDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.ORCID 0009-0004-8441-9884
Fuyuka IgarashiDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.
Ryutaro YamamotoDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.ORCID 0009-0001-8408-3370
Hiroshi AsanoDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.ORCID 0000-0002-1033-3920
Akira OkuDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.
Keiichiroh AkabaneDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.
Kiwamu NoshiroDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.
Ami HosokawaDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.
Yoshihiro SaitoDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.ORCID 0000-0002-1424-4044
Hidemichi WatariDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.
Takeshi UmazumeDepartment of Obstetrics, Hokkaido University Hospital, Kita-ku N15 W7, Sapporo 060-8638, Japan.ORCID 0000-0001-9236-9945

Funding

Japan Science and Technology Agency JPMJPF2108
6 · The paper itself

Abstract

This study proposes a multivariate analytical framework for transabdominally recorded intrauterine acoustic signals (TRIAS) and evaluates spectral changes across gestation. Using a digital stethoscope, 60 recordings were obtained from 44 pregnant women (≥14 weeks). Power spectral density (PSD) was calculated (30-2000 Hz) and analyzed using ordinary least squares (OLS) regression, principal component analysis (PCA), and partial least squares regression (PLSR). A consistent spectral peak was observed at 300-400 Hz. OLS revealed a significant decrease in PSD levels within 400-600 Hz (specifically 478.5 Hz and 521.5 Hz) during the second trimester (

Indexed as

AcousticsFetal MonitoringUterusAdultFemaleHumansLeast-Squares AnalysisMultivariate AnalysisPregnancyPrincipal Component AnalysisSignal Processing, Computer-Assistedgestational agenon-invasive monitoringpartial least squares regression (PLSR)principal component analysis (PCA)spectral analysisTRIAS

Identifiers

PMID42451392
PMCPMC13363705

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.