Why does lactate threshold correlate with performance?

In this video I explain why lactate threshold measures correlate with endurance performance, and pay particular attention to marathon running performance. Some of the papers I refer to can be found below: Coyle (1995) https://pubmed.ncbi.nlm.nih.gov/7556353/ Coyle et al. (1988) https://pubmed.ncbi.nlm.nih.gov/3403447/ Costill (1970) https://pubmed.ncbi.nlm.nih.gov/5414753/ Posterino et al. (2001) https://link.springer.com/article/10.1007/s004240100528 Ortenblad et al. (2013) https://pubmed.ncbi.nlm.nih.gov/23652590/ Burnley and Jones (2007) https://www.tandfonline.com/doi/full/10.1080/17461390701456148 Jones and Vanhatalo (2017) https://pubmed.ncbi.nlm.nih.gov/28332113/