The study, led by Yihang Gong of Dankook University in South Korea alongside colleagues from Harbin Sport University, Shenzhen Hospital of Guangzhou University of Chinese Medicine, and Dankook University, searched six databases from inception to July 2026. The team evaluated four primary endpoints: estimated glomerular filtration rate (eGFR), a key measure of kidney filtering capacity; urinary albumin excretion (UAE), a marker of kidney damage; glycated hemoglobin (HbA1c), reflecting long-term blood sugar control; and fasting blood glucose (FBG). By mapping these interventions into a network meta-analysis, the researchers could compare modalities both directly, where head-to-head trials existed, and indirectly through shared comparators.

The headline finding concerns resistance training. Compared with usual care, resistance training was the sole modality that significantly increased eGFR, with a mean difference of 11.36 mL/min/1.73 m², and it also significantly outperformed aerobic training head-to-head by 8.61 mL/min/1.73 m². In a disease where declining filtration rate signals progressive kidney failure, an improvement of that magnitude would be remarkable, potentially rivaling pharmacological interventions. On paper, resistance training also ranked highest across nearly every outcome, achieving a SUCRA score of 98.8 percent for eGFR, 94.2 percent for HbA1c, and 86.1 percent for fasting glucose.

But the authors urge heavy caution before rewriting clinical guidelines around those numbers. When the two trials judged to be at high risk of bias were excluded in sensitivity analyses, the eGFR benefit of resistance training lost statistical significance entirely, shrinking to a non-significant 8.24 mL/min/1.73 m². The researchers also note that an effect of this size is disproportionately large relative to established nephroprotective drugs, and that in early diabetic nephropathy, which made up 60 percent of the included trials, acute filtration increases may partly reflect exercise-induced glomerular hyperfiltration or transient hemodynamic shifts rather than genuine structural kidney preservation. Disparate filtration equations across trials, from MDRD to CKD-EPI, add further measurement noise.

Mind-body exercise carved out its own niche. It was the only intervention that significantly reduced urinary albumin excretion compared with usual care, with a standardized mean difference of -1.41. Albuminuria is one of the earliest and most prognostically important signs of diabetic kidney damage, so a practice like Tai Chi or Baduanjin, low-impact and highly accessible, offering a measurable reduction is clinically intriguing. The certainty of this evidence was rated low under the CINeMA framework, but the finding aligns with the supplement’s exploratory observation that mind-body exercise also produced a notable systolic blood pressure reduction of roughly 15.7 mmHg, reinforcing its potential cardiovascular relevance.

For glycemic control, the picture was broader. Resistance training, aerobic training, and combined training all significantly lowered HbA1c compared with usual care, by 1.65 percent, 1.07 percent, and 0.70 percent respectively, though all at low certainty. Fasting blood glucose fell significantly only with resistance training (-1.78 mmol/L) and combined training (-1.71 mmol/L), the latter supported by moderate certainty of evidence, the highest rating in the entire analysis. In head-to-head comparisons, both resistance and combined training significantly beat aerobic training on fasting glucose.

Combined training, which blends aerobic and resistance elements, emerged as the most durable performer in subgroup analyses. It was the only modality to sustain significant fasting glucose reductions across both short-term regimens of twelve weeks or less (-1.50 mmol/L) and longer-term programs beyond twelve weeks (-2.39 mmol/L). Most other benefits, including eGFR and albumin improvements from resistance and aerobic training, faded in the long-term subgroup. This temporal pattern matters because diabetic kidney disease is a chronic, progressive condition, and interventions whose effects evaporate after a few months offer limited clinical value.

Sensitivity analyses probing confounding added further nuance. When the researchers restricted the synthesis to pure exercise interventions, excluding four trials that bundled exercise with traditional Chinese medicine, specialized nursing protocols, or structured nutritional guidance, the HbA1c benefit of combined training lost significance. Yet in a pragmatic scenario that removed medication and nursing trials while retaining guideline-directed dietary advice, all primary conclusions held. The authors interpret this as evidence that routine nutritional counseling, an intrinsic part of standard diabetic kidney disease care, does not undermine the exercise signal, though residual interactive confounding cannot be fully excluded.

Perhaps the most sobering finding concerns safety. Structured adverse event monitoring was documented in only five of the twenty trials, or 25 percent. Three of those reported mild, transient events such as hypoglycemia, musculoskeletal discomfort, and falls without serious harm, while two explicitly declared zero adverse events. The remaining fifteen trials simply omitted safety surveillance altogether. This sparse reporting means the comparative safety of different exercise intensities and modalities in diabetic kidney disease cannot be definitively established, a gap the authors say mandates routine surveillance in future studies.

The practical takeaway is individualization rather than a single winning prescription. The authors recommend combined training as a balanced, pragmatic foundation for sustained glycemic management, mind-body exercise as a viable strategy for patients with limited functional capacity or concerns about albuminuria, and resistance training only with caution given its fragile renal evidence. Direct head-to-head trials between active modalities remain scarce, with only three in the entire network, so most comparative rankings rest on indirect evidence. Larger, multi-center trials with standardized FITT reporting, longer follow-up, and mandatory safety monitoring are needed before exercise prescriptions for diabetic kidney disease can be built on firmer ground.

Subject of Research: Comparative efficacy of exercise modalities on renal function and glycemic control in non-dialysis diabetic kidney disease

Article Title: Comparative efficacy of different exercise modalities on renal function and glycemic control in patients with non-dialysis diabetic kidney disease: a systematic review and network meta-analysis

Article References: Gong, Y., Zheng, J., Huang, W., & Jeon, Y. (2026). Comparative efficacy of different exercise modalities on renal function and glycemic control in patients with non-dialysis diabetic kidney disease: a systematic review and network meta-analysis. Frontiers in Endocrinology, 17, Article 1991940. https://doi.org/10.3389/fendo.2026.1991940

Image Credits: AI Generated

DOI: 10.3389/fendo.2026.1991940

Keywords: diabetic kidney disease, exercise therapy, resistance training, network meta-analysis, renal function, glycemic control, HbA1c, albuminuria, mind-body exercise, combined training, eGFR, randomized controlled trials