“…Interventions were three weeks 66 , six weeks 50 , 51 , 68 , 69 , seven weeks 71 , eight weeks 54 , 56 , 61 twelve weeks 39 , 72 – 75 , sixteen weeks 53 , eighteen weeks 65 , 36 weeks 55 and 12 months 62 . HIEG participants trained with a mean frequency of 2.8 times/week, so most of the interventions programs were delivered 3 times/week 37 , 50 , 51 , 54 , 55 , 60 – 63 , 68 , 69 , 75 , 76 , although in some were 2 days/week 39 , 53 , 57 , 58 , 65 , 67 , 70 and 5 days/week 71 . All high-intensity interventions were supervised and conducted indoors, except Schmitt et al (2016), who evaluated the effects of a program performed outside on a paved uphill road 66 .…”