Aerobic high-intensity interval training and maximal strength training in patients with unspecific musculoskeletal disorders improve V̇O2peak and maximal strength more than moderate training.

People recovering from unspecific musculoskeletal disorders are usually given low-to-moderate intensity exercise in rehabilitation programs, partly out of concern that harder training might trigger pain or fear of movement. This trial asked whether adding high-intensity aerobic intervals and maximal strength training to a standard four-week rehabilitation program could be tolerated and would produce better fitness and strength gains than the usual moderate approach. Seventy-three patients were randomised to either the high-intensity approach or continued low-to-moderate training.

The high-intensity group showed larger improvements in peak oxygen uptake and leg press strength than the moderate-intensity group, and no adverse events were reported, with dropout rates and quality-of-life outcomes similar between groups. This is interesting because it challenges the assumption that people with musculoskeletal pain cannot tolerate harder training within a supervised clinical setting. The main limitation is the small, single-program sample and short four-week timeframe, which leaves questions about longer-term outcomes and broader applicability.

If you have ongoing musculoskeletal pain, you might assume that gentler exercise is safer and more realistic than tougher training. This study looked at whether adding harder aerobic intervals and heavier strength training to a standard four-week rehab program could work as well or better than the usual lower-intensity approach, without causing harm or extra dropout. Researchers found that people doing the higher-intensity program improved their fitness and leg strength more than those doing the usual moderate program.

Importantly, no one reported adverse events, and people didn't drop out more often or report worse quality of life in the high-intensity group. This is encouraging news for how rehab programs might be structured, but the study was small and only lasted four weeks, so it can't tell us about longer-term effects or whether this approach suits everyone with musculoskeletal pain. It also focused on fitness and strength measures rather than pain itself.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This randomised controlled trial compared a four-week rehabilitation program incorporating high-intensity interval training (4x4 minutes at approximately 90% HRmax) and maximal strength training (4x4 reps at approximately 90% 1RM with maximal intended velocity) against standard low-to-moderate intensity treatment (cycling/walking at 70-80% HRmax, 3x8-10 reps at 75% 1RM without maximal velocity) in 73 patients with unspecific musculoskeletal disorders. The high-intensity group showed significantly greater improvements in peak oxygen uptake (12±7% vs 5±6%) and leg press one-repetition maximum (43±34% vs 19±18%), both p<0.001. No between-group differences emerged in dropout rate or self-reported quality of life, and no adverse events were reported.

Exploratory correlations linked improved peak oxygen uptake with improved physical and emotional role functioning, though these are secondary findings and do not establish causation. The trial is small and single-setting, with a short four-week intervention window, limiting generalisability and long-term inference. The findings support feasibility of higher-intensity protocols in this population within a supervised clinical context, but do not address pain outcomes directly or longer-term maintenance of gains.