Combining cardio with lifting cut inflammation more than either alone
In short
In a network meta-analysis of 28 randomised controlled trials in patients with metabolic syndrome, combined aerobic-plus-resistance training reduced inflammatory markers more than either modality alone. For CRP, combined training ranked first at SMD -0.79 (95% CI -1.36 to -0.21, SUCRA 86.8%), followed by aerobic exercise at -0.64, with resistance training showing a smaller effect. Combined training also produced the largest TNF-α reduction at -1.74. Only the CRP finding carried moderate certainty with no publication bias (p=0.86); TNF-α and IL-6 both showed significant publication bias and should be read with caution.
Which exercise modality best lowers inflammation in metabolic syndrome has stayed unsettled, mostly because few trials put aerobic and resistance work head to head. This network meta-analysis pulled 28 randomised controlled trials into one comparison network, ranking modalities that had never been directly compared through indirect evidence.
The result points one way. Combined aerobic-plus-resistance training ranked first for both CRP and TNF-α. If you only pick one, aerobic; if you do both, better.
How did the rankings split by marker?
- CRP — combined training SMD -0.79 (95% CI -1.36 to -0.21, SUCRA 86.8%), aerobic -0.64 (-0.95 to -0.32). Resistance alone was smaller
- TNF-α — combined training SMD -1.74 (95% CI -3.06 to -0.43, SUCRA 75.7%), then resistance, then aerobic
- IL-6 — no modality reached statistical significance. Resistance training merely ranked highest (SUCRA 75.8%)
Which of these numbers actually holds?
The authors drew the line themselves. Only CRP reached moderate certainty and came through the publication-bias test clean (p=0.86). TNF-α and IL-6 carried high heterogeneity and significant publication bias. An effect size of -1.74 looks impressive on its own, but a confidence interval running from -3.06 to -0.43 means the true magnitude was barely pinned down at all.
So one sentence survives from this paper: combined training lowers CRP. The rest is circumstantial evidence pointing the same direction, not a conclusion.
Didn't an earlier analysis put aerobic first?
Different population. In a network meta-analysis of 2,836 adults over 60, aerobic exercise ranked first for CRP reduction. This analysis grouped people not by age but by metabolic syndrome, and there combined training led. Read together, the message is that the optimal modality for inflammation depends on who is training. This is not a domain where one protocol wins for everyone.
What does it mean for someone who only lifts?
Resistance training placing behind aerobic on inflammatory markers is not a reason to lift less. Combined training won here, which means resistance work plus cardio beat resistance work alone. There is something to add, not something to remove.
A muscle index is computed from squat, bench, and deadlift alone. No amount of cardio raises it by a point, and dropping cardio entirely does not lower it. That is an axis the score does not measure — and in a sport organised around bodyweight, plenty of lifters overlap with metabolic-syndrome risk. Two or three 20–30 minute low-intensity sessions a week, tacked onto the end of a lifting day or dropped on a rest day, is the cheapest way to cover that axis without touching your numbers.
This analysis studied patients diagnosed with metabolic syndrome. It is not evidence that a healthy trainee sees the same magnitude of effect — when inflammatory markers are already low, there is less room for them to fall.
On what cardio intensity suits a lifter, see zone 2 cardio for lifters.
Frequently asked questions
For lowering inflammation, should you do cardio or lift?
In a network meta-analysis of 28 randomised controlled trials in metabolic syndrome patients, doing both ranked first for CRP and TNF-α alike. If you have to choose one, aerobic exercise reduced CRP more than resistance training alone.
How much did combined training lower CRP?
By a standardised mean difference of -0.79 (95% CI -1.36 to -0.21), ranking first at SUCRA 86.8%. Aerobic exercise alone followed at -0.64 (-0.95 to -0.32). The CRP result reached moderate certainty with no significant publication bias (p=0.86).
Are the TNF-α and IL-6 results trustworthy?
Not at face value. Both showed high between-study heterogeneity and significant publication bias. No modality reached statistical significance for IL-6 at all; resistance training simply ranked highest by SUCRA (75.8%).
Does this mean resistance training does nothing for inflammation?
No. Resistance training was also associated with TNF-α reduction versus control, and the best results came from resistance training combined with aerobic work. The finding argues for adding cardio, not for cutting lifting.
Why does another study rank aerobic exercise first?
Because the populations differ. An analysis of adults over 60 put aerobic exercise first for CRP reduction, while this analysis of metabolic syndrome patients put combined training first. The best modality for inflammation depends on the health status of the person training.
Source: PubMed