Chronic Kidney Disease in Seniors: The Exercise Paradox

Chronic Kidney Disease (CKD) affects an estimated 17% of Indians over 60, making it one of the most prevalent conditions in the elderly population. Patients with CKD are typically advised to limit physical activity, avoid dehydration, and focus on medication management. This advice is increasingly at odds with the evidence.

The Exercise Paradox in CKD

The paradox is this: CKD patients are at extremely high cardiovascular risk (cardiovascular disease is the leading cause of death in CKD), and exercise is one of the most effective cardiovascular interventions available. Yet exercise has historically been underutilised in CKD management, partly due to concerns about acute kidney injury from dehydration or rhabdomyolysis.

These concerns are largely unfounded for moderate-intensity exercise in stable CKD patients. A Cochrane review of 45 randomised controlled trials found that exercise training in CKD patients is safe and produces significant improvements in cardiovascular fitness, muscle strength, quality of life, and blood pressure.

What Exercise Does for the Kidneys

The evidence on whether exercise directly improves kidney function (GFR) is mixed — some studies show modest improvements, others show no change. But the indirect benefits are substantial:

• •Cardiovascular protection: Exercise reduces the cardiovascular risk that is the primary cause of death in CKD
• •Blood pressure control: Exercise lowers blood pressure, reducing one of the main drivers of CKD progression
• •Glycaemic control: In diabetic CKD, exercise improves insulin sensitivity, reducing the glucose toxicity that damages kidneys
• •Muscle preservation: CKD causes accelerated sarcopenia; resistance training partially counteracts this

Practical Considerations

Exercise prescription in CKD requires careful attention to: fluid balance (adequate hydration without overhydration), electrolyte monitoring (potassium levels may rise with intense exercise in CKD), timing relative to dialysis sessions (in dialysis patients), and the presence of anaemia (common in CKD, limiting exercise tolerance).

PHA coaches working with CKD patients coordinate closely with the patient's nephrologist, monitor for warning signs, and adjust exercise intensity based on the patient's current kidney function stage.