Inspiratory muscle training in natural bodybuilders: adaptations in diaphragm muscle thickness and maximal strength

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dc.authoridBirinci, Mürşit Ceyhun / 0000-0002-7258-1217
dc.contributor.authorGüler, İskender
dc.contributor.authorYılmaz, Coşkun
dc.contributor.authorSoylu, Hakan Hüseyin
dc.contributor.authorBirinci, Mürşit Ceyhun
dc.contributor.authorArslan, Ayla
dc.contributor.authorOcak, Hakan
dc.contributor.authorÇayır, Hüseyin
dc.date.accessioned2026-02-03T12:00:03Z
dc.date.available2026-02-03T12:00:03Z
dc.date.issued2025
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractBackground: The effect of inspiratory muscle training on diaphragm muscle thickness (DT) and one repetition maximal (1RM) in professional natural bodybuilders is still unclear. The aim of the study was to investigate the effect of inspiratory muscle training on diaphragm muscle thickness and 1RM in professional natural bodybuilders. Methods: The study comprised a total of 22 athletes who participated in bodybuilding competitions. Each athlete had undergone a minimum of 5 years of training, with a minimum weekly commitment of 5 hours. Participants were randomly divided into two groups: inspiratory muscle training (IMT) and control (CON). The CON continued their normal training regime, while the IMT group also performed inspiratory muscle training with a 10% weekly increase by setting the resistance setting of the PowerBreathe (R) Classic device to 40% of the participant's maximum inspiratory pressure (MIP). Prior to and during the 4-week training period, 1RM bench press measurements and diaphragm muscle thickness measurements were obtained. Results: In the comparison of 1RM power values before and after training, it was determined that the IMT group (%: 11.20) had 6.3% more post-activation performance enhancement compared to the CON group (%: 4.9) (p < 0.001). In the study, it was determined that a higher level of significant post-activation performance enhancement was obtained in the IMT group compared to the CON group in the diaphragm muscle thickness inspiratory phase (DT ins) and ekspiratory phase (DT eks) parameters at 20.36% and 19.46%, respectively. Conclusion: In conclusion, we determined that the addition of progressive loading inspiratory muscle training to preparation programmes in natural bodybuilders will improve diaphragm muscle thickness, 1RM physical performance. In particular, it shows that the diaphragm muscle should be considered not only as a muscle that supports respiration, but also as a muscle that contributes to power generation by optimising intra-abdominal pressure.
dc.description.sponsorshipThe author(s) declare that no financial support was received for the research and/or publication of this article.
dc.identifier.doi10.3389/fphys.2025.1628146
dc.identifier.issn1664-042X
dc.identifier.pmid40832136
dc.identifier.scopus2-s2.0-105013463386
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.3389/fphys.2025.1628146
dc.identifier.urihttps://hdl.handle.net/20.500.12428/34499
dc.identifier.volume16
dc.identifier.wosWOS:001552542900001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherFrontiers Media Sa
dc.relation.ispartofFrontiers in Physiology
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20260130
dc.subjectbodybuilding
dc.subjectdiaphragm muscle thickness
dc.subject1RM
dc.subjectresistance training
dc.subjectinspiratory muscle training
dc.subjectphysical performance
dc.titleInspiratory muscle training in natural bodybuilders: adaptations in diaphragm muscle thickness and maximal strength
dc.typeArticle

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