Eight Weeks of Aerobic Interval Training Improves Psychomotor Function in Patients with Parkinson’s Disease—Randomized Controlled Trial, Jaroslaw Marusiak et al., Int. J. Environ. Res. Public Health 2019, 16(5), 880.

"... the current study is the first randomized controlled study to present a positive generalized effect with a moderate intensity aerobic interval training (AIT) regimen on a cycle ergometer."

"Previous studies have established that interval training is more enjoyable and effective than continuous exercise programs for non-PD populations."

"... other studies have shown that the BDNF increase following interval training is greater than that following continuous regimen training."

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(hat tip to easilly at HU for the link)