Mixed
Resistance training interventions introduce significant interindividual response variation (heterogeneity) in strength and hypertrophy outcomes beyond random measurement error, as evidenced by increased variance in change scores compared to non-training controls.
Do not assume that a resistance training program that works for others will work identically for you. The paper confirms that resistance training introduces significant individual variability in strength and muscle growth. If you are not progressing, it may be due to your specific 'trainability' or response pattern rather than poor adherence. Consider that personalized adjustments to volume, intensity, or exercise selection may be necessary, as 'one size fits all' prescriptions are statistically less likely to optimize individual outcomes.
both the SDir (figure 4) and lnV R (figure 5) were also positive for both strength... and hypertrophy outcomes... indicating that exposure to the RT interventions may have introduced additional variance over and above random error, potentially suggesting the presence of interindividual response variation.
Why this rating
Based on a meta-analysis of 111 studies from a previous systematic review, using robust multilevel mixed-effects models.
Source
Meta-analysis of variation in sport and exercise science: Examples of application within resistance training research
James Steele et al. · Journal of Sports Sciences · 2023
DOI 10.1080/02640414.2023.2286748
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →