Sounds great if you've got an assistant who can raise the weight back up for you!
"...each participant in the CON group was instructed to lift a dumbbell for the concentric phase in 2s, and each participant in the ECC group lowered a dumbbell in 2s, and the investigator set the dumbbell in the starting position (0° for CON, 50° for ECC) after each contraction"