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24-week HIIT intervention can effectively delay the decline of renal function and the progression of renal fibrosis in naturally aging rats. Its protective effect may be associated with inhibiting the overactivation of the TGF-β1/Smad signaling pathway. High-volume HIIT (H1) induced a more profound suppression of the pro-fibrotic pathway, whereas low-volume HIIT (H2) represents a time-efficient strategy conferring notable protection at the phenotypic level.
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Zhang et al. (2025) studied this question.
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