Peroxisomal proliferator-activated receptor gamma co-activator-1 alpha gene expression increases above the lactate threshold in human skeletal muscle.
This study shows that exercise intensity, and not duration and/or total energy expenditure can upregulate something called Peroxisomal proliferator-activated receptor gamma co-activator-1 alpha ( PGC-1α ).
There reason intensity is important because of the lactate threshold. Once this threshold is breached, your body is like "Okay damn were exhausted, time to make new mitochondria to cope with all this lactate"
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