is it best to stand up and reset after each rep? Or breath at the top and touch and go? Or pause and reset at bottom without standing up and losing tension?
Training Effects
1) Stand Up And Rest: Performing in this manner make turn it into Cluster Set Training. That means you are training a brief rest between each repetition or cluster of repetitions.
Pausing build strength or power, dependent on the load you are using, from the floor position.
This short rest period allows you to pull more weight.
2) Touch and Go: This is a quazi-Plyometric type action. You obtain some momentum with the bounce off the floor.
The Touch and Go decreases the amount of strength required come off the floor, with the momentum.
The Touch and Go allow you to increase the loading more in the middle range of the movement.
3) Pause and Reset Without Standing: This falls into being Cluster Set Training, a variation of Standing up and resting between each repetition. Essentially, this option and your first option are the same.
Cluster Set and Paused Deadlift each provide a different training effect. One is not necessarily better than the other.
You training option is dependent on what your training objective is; increasing strength in off the floor or more in the middle range of the movement.
Kenny Croxdale