# REV-007 — Why exposure duration and signal modulation matter

Collection: Reviews & proposed mechanisms (not an original experiment)

Doi: 10.1080/15368378.2022.2065683

Title: The roles of intensity, exposure duration, and modulation on the biological effects of radiofrequency radiation and exposure guidelines

Authors: Henry Lai; B Blake Levitt

Date: 2022-04-19

Issueyear: 2022

Why: Intensity alone may miss important differences between a brief signal and repeated, modulated exposure.

Summary: Examines intensity, duration and modulation; reports effects in a selected set of 112 low-intensity studies and argues these exposure characteristics deserve greater attention in guideline assessment.

Limitations: Narrative selection rather than a pooled risk estimate. The median SAR reported for selected effect studies is not a threshold for harm, and biological effects differ in relevance.

Scope: A narrative review examining low-intensity effects alongside exposure duration and modulation, including a selected set of 112 studies.

Exposures: Radiofrequency; Modulated wireless signals

Journal: Electromagnetic biology and medicine

Heading: Why exposure duration and signal modulation matter

Id: REV-007

Kind: Narrative review

Topics: Exposure duration; Signal modulation; Exposure standards

Links: https://doi.org/10.1080/15368378.2022.2065683; https://pubmed.ncbi.nlm.nih.gov/35438055/

Author: Lai et al.

Access Label: Abstract checked

Source Check: Original PubMed/EPMC metadata and abstract checked; full article not assessed. Linked PubMed/Europe PMC notice records checked on 21 October 2026; this is not a guarantee that every editorial update is indexed.

Citation: Henry Lai; B Blake Levitt. The roles of intensity, exposure duration, and modulation on the biological effects of radiofrequency radiation and exposure guidelines. Electromagnetic biology and medicine. 2022. doi:10.1080/15368378.2022.2065683.

Url: /reviews/rev-007/

Year: 2022

Record Type: review_or_mechanism

Source Url: https://doi.org/10.1080/15368378.2022.2065683