A 9-month randomized controlled trial found that supervised aerobic and resistance exercise improved kidney filtration rates in adults with type 2 diabetes, with greater effects in women and younger participants. The effect size was modest but clinically measurable.
Kidney disease represents one of the most common complications of type 2 diabetes, affecting roughly one in four adults with the condition. Yet evidence on whether exercise can slow or reverse kidney function decline in this population remains sparse. This new randomized controlled trial, published in Diabetes and Metabolic Syndrome, tested whether a structured combination of aerobic and resistance training could improve kidney health markers in people with type 2 diabetes who did not yet have diagnosed kidney disease.
The study enrolled 136 adults with type 2 diabetes across four primary care centers in Catalunya. Participants ranged from 41 to 87 years old. The intervention group completed two supervised 60-minute sessions per week combining moderate-to-vigorous aerobic exercise with resistance training for 9 months. The control group received standard diabetes care without the structured exercise program. Researchers measured changes in estimated glomerular filtration rate (eGFR), a key indicator of how well the kidneys filter waste from blood, and urinary albumin, a marker of kidney damage.
The results showed a meaningful between-group difference in kidney function trajectories. After 9 months, eGFR increased by 1.8 mL/min/1.73 m2 in the exercise group while declining by 3.4 mL/min/1.73 m2 in the control group. This 5.2 mL/min/1.73 m2 difference between groups reached statistical significance (p = 0.019). Put plainly: the exercise group bucked the typical age-related decline in kidney filtration, while the control group experienced expected functional loss. The improvements were particularly pronounced in women, participants under 65 years old, and those with poorly controlled blood sugar levels at baseline. All three of these subgroups showed significantly greater eGFR gains in the intervention arm.
Notably, urinary albumin levels, which reflect microscopic protein leakage indicating kidney damage, did not differ significantly between groups. This finding suggests that the exercise effect on eGFR may operate through mechanisms that preserve overall filtration capacity rather than reducing glomerular injury specifically. The 9-month timeframe also means these are relatively short-term results; longer follow-up would clarify whether benefits persist or expand over years.
If you have type 2 diabetes without advanced kidney disease, this evidence supports structured resistance-training combined with aerobic work as a tool for preserving kidney function. The study used two weekly supervised sessions; adherence to a regular exercise schedule appears important.
The effect was not uniform across all participants. Women and younger adults showed larger improvements, as did those with elevated blood sugar levels at the start. If you fall into these categories, the evidence base for exercise's kidney protective effects becomes somewhat stronger. Conversely, if you have well-controlled diabetes, the relative benefit remains uncertain.
This is not evidence that exercise replaces standard diabetes management. Blood sugar control, blood pressure management, and medications like ACE inhibitors or ARBs remain first-line approaches to preventing kidney disease. Exercise appears to be an additive strategy, not a substitute.
The absence of changes in urinary albumin is worth noting. If you already show signs of kidney damage (measured through albumin in urine), this study doesn't clarify whether the same exercise program would benefit you. Anyone with existing kidney disease should consult their physician before starting a new exercise regimen, particularly resistance training, since kidney function affects how the body handles metabolic stress.
| Attribute | Details |
|---|---|
| Study type | Randomized controlled trial |
| Sample size | 136 adults (52 intervention, 84 control) |
| Duration | 9 months |
| Age range | 41-87 years |
| Population | Adults with type 2 diabetes, no baseline kidney disease |
| Intervention | 2 supervised sessions/week, 60 minutes each; combined moderate-to-vigorous aerobic and resistance exercise |
| Control | Standard diabetes care |
| Primary outcome | Change in eGFR (estimated glomerular filtration rate) |
| Secondary outcome | Change in urinary albumin |
| Result (eGFR) | Between-group difference: 5.2 mL/min/1.73 m2 (95% CI: 0.9-9.5, p = 0.019) |
| Result (albumin) | No significant between-group difference |
| Notable subgroup effects | Greater eGFR improvements in women, participants <65 years, those with uncontrolled diabetes |
| Funding/Conflicts |
Diabetes and Metabolic Syndrome. PubMed ID: 41886945.
ProtocolEngine provides general health information based on published research. This is not medical advice. Consult a healthcare professional before starting any supplement or health protocol.
| Not specified in abstract |
| Location | Four primary care centers in Catalunya |