Exercise and inflammation
5 papers in the library, strongest Moderate.
Graded Moderate · Pooled 26 trials with random assignment and 1,297 participants; only three publications were rated at low risk of bias, and long-term data are missing.
Papers 5
- Exercise Lowers Only One of Three Inflammation Markers in Old AgeModeraten = 1,2972026Frontiers in immunologyToo many inflammation signals in the blood weaken muscle strength. They are also linked to how muscle loss and frailty develop and worsen in old age. A new analysis of exercise studies found that in older adults with these problems, training lowered one such signal: TNF-alpha, a messenger that drives inflammation. Two other common inflammation markers in the blood, interleukin-6 and C-reactive protein (CRP), showed no clear change. The researchers pooled 26 trials with 1,297 older adults who had age-related muscle loss, frailty or both. In every trial, chance decided who exercised. The exercise groups did endurance training, strength training or both for at least four weeks. The comparison groups got things like health education or usual care. TNF-alpha fell clearly in people with muscle loss, while no clear difference was detected in frail people. The evidence has limits. Only three of the 21 included publications were rated at low risk of bias, meaning built in ways that keep errors out. Whether the effect lasts is unknown, because none of the trials collected long-term follow-up data.
- Type 2 Diabetes: Cardio and Weights Leave Different Marks in BloodModeraten = 2,7412026Diabetes, obesity & metabolismFor people with type 2 diabetes, cardio and strength training seem to shift different blood values. After aerobic exercise, adiponectin, a hormone made by fat tissue, went up. Leptin, another fat tissue hormone, went down. Two inflammation messengers, TNF-alpha and interleukin-6, also fell. Strength training was mainly linked to drops in those same two inflammation markers. The researchers pooled 60 studies in which a random draw decided who exercised and who did not. Together they included 2,741 adults with type 2 diabetes. A special statistical method let them compare training types that were never tested head to head. Interval training with short, hard bursts also lowered TNF-alpha. People who did cardio more often saw a larger drop in interleukin-6. The authors urge caution themselves. For interleukin-6, data from different comparisons did not always agree. Extra analyses by age and body weight offer only early hints. The authors see the results as a source of new questions, not as grounds for ranking training types or making exercise recommendations.
- Women 65 and Older Gain Muscle With Training Plus Amino AcidsModeraten = 962026Journal of the International Society of Sports NutritionOlder women who did strength training for three months and also drank protein building blocks gained estimated muscle mass. They also scored better on a fitness test designed for older adults. The researchers conclude that the combination worked better than either training or the drink alone. The study in South Korea enrolled 96 healthy women aged 65 or older, about 73 on average. They were split at random into four groups: no change, training, amino acids, or both. Training was a one-hour circuit three times a week, first with resistance bands, later with kettlebells. Essential amino acids are protein building blocks the body cannot make itself. Women took 5.5 grams in water twice a day. In both training groups, blood levels of myostatin, a protein that brakes muscle growth, went down. An inflammation marker called TNF-alpha fell only in the group that did both. Muscle mass was estimated with a weak electrical current. This method captures all fat-free tissue and is affected by hydration. Twenty of the 96 women dropped out, and diet was not fully controlled. Whether the combination slows age-related muscle loss in the long run cannot be told from 12 weeks in women who were already fit.
- Vitamin K2 Does Not Speed Muscle Recovery After Weight TrainingModeraten = 802026Medicine and science in sports and exerciseSore, weak muscles can linger for days after a tough strength session. Vitamin K2 has been suggested as a way to recover faster. In this trial it made no measurable difference: strength, everyday movement, soreness and inflammation markers in the blood recovered the same with or without it. The volunteers were healthy adults aged 18 to 40 and adults aged 65 or older. They were chosen at random to take either 240 micrograms of vitamin K2 or a dummy pill every day for 12 weeks. Of 80 people, 71 finished. Before and after the 12 weeks, everyone did an exercise designed to strain the thigh muscles. The team then tracked strength, soreness and blood values for three days. Vitamin K2 levels in the blood rose clearly. Only in the older group did small differences appear. Signals between nerve and muscle ran slightly faster, and a blood marker of muscle damage was lower after three days. The authors see these as leads for future research. Whether the vitamin helps frail older people is unclear, because the older adults here were very healthy.
- Older Women Who Trained Saw an Inflammation Signal DropPreliminary2026Journal of sport and health scienceOlder women who exercised regularly for 48 weeks became stronger, more mobile and better at endurance tasks. Over the same period, an immune messenger in their blood called CXCL2 fell sharply, along with a second inflammation marker. In the group that did not exercise, physical performance declined and these inflammation levels rose. The researchers first spotted CXCL2 in public data on gene activity. In older adults, blood levels were higher the more severe their age-related muscle loss. Higher levels also tracked closely with poorer physical performance. In experiments with mice and cells, the messenger rose when muscles wasted or were injured. A single bout of endurance running turned it down. When the team blocked the docking site for CXCL2 in the lab, signals of muscle breakdown weakened. This points to CXCL2 as one link between aging and muscle loss. Whether lowering CXCL2 itself slows muscle loss in people was not tested, because the blocking was done only in the lab. The abstract also does not say how many people took part or whether groups were chosen at random.
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