Resistance training added 68.5m of walking but moved no inflammation marker
In short
An umbrella review of 11 meta-analyses in haemodialysis patients with chronic kidney disease found resistance exercise improved six-minute walk distance by 68.50m (95% CI 29.05–107.96) and the physical component score by 10.05 (2.95–17.14), with no significant effect on C-reactive protein or depression. Aerobic exercise did the reverse: CRP fell 3.28 (-4.68 to -1.88), systolic blood pressure fell 10.07 mmHg (-16.35 to -3.78) and depression improved markedly (SMD -0.93), while the physical component score did not move. The two modes buy different things.
"Can I just lift instead of doing cardio?" This umbrella review answers with a clean no. Measured on the same outcomes in the same population, what aerobic training moved and what resistance training moved barely overlapped.
The authors searched Embase, PubMed/MEDLINE, the Cochrane Library and Web of Science through January 2026 and assembled 11 meta-analyses of exercise in haemodialysis patients with chronic kidney disease. Methodological quality of each was rated with AMSTAR 2, and certainty of evidence per outcome with GRADE.
What aerobic training bought
The aerobic column is wide and mostly internal. Peak VO2 +2.07 (95% CI 0.42–3.72), six-minute walk +64.98m (43.96–86.11), systolic blood pressure -10.07 (-16.35 to -3.78), C-reactive protein -3.28 (-4.68 to -1.88), depression SMD -0.93 (-1.32 to -0.55), and Kt/V +0.08 (0.00–0.15), the dialysis adequacy measure. Diastolic blood pressure, the physical and mental component scores of quality of life, and serum phosphorus did not change.
What resistance training bought
Resistance training moved exactly two outcomes, and both are about what the body can actually do. Six-minute walk +68.50m (29.05–107.96) and the physical component score +10.05 (2.95–17.14). It had no significant effect on Kt/V, CRP or depression.
That contrast is the paper. Resistance training produced a larger mean six-minute walk improvement than aerobic did (68.50 vs 64.98) and raised a physical function score that aerobic training never touched, by 10.05 points. In exchange, the blood and circulatory markers — inflammation, blood pressure — belonged to the aerobic column only.
So does doing both get you everything?
Not exactly. Combined training showed improvement across the widest set of outcomes — peak VO2, diastolic blood pressure, physical component score, mental component score, CRP and depression. But it was not significant for Kt/V, six-minute walk or systolic blood pressure: several of the outcomes each single mode won decisively did not reach significance when the modes were combined.
That is not evidence that combining is worse. Different study counts and protocols explain it more plausibly. But it does mean the assumption that mixing automatically sums both effects is not supported here. When total training time is fixed, how you split it is still a real choice.
The population is haemodialysis patients with chronic kidney disease, and the authors' own conclusion states that high-certainty evidence is lacking. An umbrella review pools meta-analyses rather than primary trials, so overlapping source studies can inflate an effect. If you are on dialysis or managing a chronic condition, the type, intensity and timing of exercise is a decision to make with your care team; this article is material for that conversation. Exercise and inflammatory markers are covered further in the exercise dose for inflammation.
The part a healthy lifter can use
The numbers come from a clinical population, but the structure — different markers answer to different stimuli — transfers directly to programming. Your bench can climb while resting heart rate and blood pressure sit still, and no amount of cardio builds the strength to carry a load up stairs. That is precisely why zone 2 cardio for lifters is worth keeping as insurance rather than cutting.
Put in fairlift terms: a Muscle Index score answers only to a strength stimulus, because it is computed from Big 3 1RMs. So if the score is all you log, everything aerobic work bought — blood pressure, resting heart rate, recovery between sessions — never appears in your record at all. A plateaued score can sit on top of large gains on another axis, and the reverse is equally possible. An axis you do not log is an axis that does not exist.
Frequently asked questions
Can resistance training replace cardio?
Not in this umbrella review. Resistance exercise improved six-minute walk distance (+68.50m) and the physical component score (+10.05) but had no significant effect on C-reactive protein, depression or dialysis adequacy (Kt/V). Those outcomes moved only with aerobic exercise.
Which outcomes did aerobic exercise move?
In haemodialysis patients, aerobic exercise produced peak VO2 +2.07, six-minute walk +64.98m, systolic blood pressure -10.07, C-reactive protein -3.28, depression SMD -0.93 and Kt/V +0.08. Diastolic blood pressure, the quality-of-life component scores and serum phosphorus were unchanged.
Does combining both add the effects together?
Not in this data. Combined training improved peak VO2, diastolic blood pressure, both quality-of-life component scores, CRP and depression, but was not significant for Kt/V, six-minute walk or systolic blood pressure. Differing study counts and protocols likely explain it, but automatic summation should not be assumed.
How certain is this evidence?
Low. The authors state in their conclusion that high-certainty evidence is lacking under GRADE. An umbrella review also pools 11 meta-analyses, so overlapping primary studies can overstate an effect.
What applies to healthy people?
The structure rather than the numbers. Different markers respond to different stimuli: a strength stimulus moves function and strength measures, an aerobic stimulus moves blood pressure, inflammation and cardiorespiratory measures. Logging only 1RM therefore hides everything aerobic training changed.
Source: PubMed