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A person lifts 80pounds or 80% of his RM {one repetition maximum lift} for the last 40% of the concentric lift, the weight decelerates.

Which or can both of these be deceleration and why please.

1,

His RM = 100 pounds, so for the first 60% he will be roughly pushing with a force of 100 pounds, then at 60% he will be pushing with a force of 99 pounds, then at 62% he will be pushing with a force of 98 pounds, and so on until say 80% where he will use less force than the load and use 79% and less and less force to get to a very slow speed for the transition, then he will be lowering the weight on the eccentric.

2,

His RM = 100 pounds, so for the first 60% he will be roughly pushing with a force of 100 pounds, then at 60% he will be pushing with a force of less force than the weight which will be 79% for the deceleration. {retardation, negative acceleration}

As far as I know deceleration is of slowing down of the weight, thus, deceleration will still be the weight moving in the positive direction, up in this example, just on the deceleration it will be starting to move in the positive direction a little slower than it was before.

Wayne