Fig. 3From: Effect of high-intensity interval training in young heart transplant recipients: results from two randomized controlled trialsMean change ± SE in extensors’ maximum strength between exercise-groups in both trials at follow-up. Legend: A visualization of young vs. old in the TEX and the HITTS study. The bars marked with “**” or “*” means that the mean change was significant (p < 0.01, or p < 0.05) at follow-up, as presented in Tables 2 and 3Back to article page