- variances in the speed with which it is possible to set off the activity
- the eccentric (lowering) action
- overall time spent to execute one rep
- arrangement of the Pull Up in your workout
- level of synergistic muscle contribution throughout the set
- range of flexibility
- degree of muscular failure experienced
To increase muscle stimulation, aim to take around 1-3 seconds on the concentric element of the Pull Up, and 5-8 seconds on the eccentric (lowering) part. The Pull Up, like any other free weight exercise, is only able to trigger the Lats and Rhomboids if you force them to do the majority of the work. This is what is meant by the brain and muscle connection. Lift and then perform the eccentric (lowering portion of the Pull Up) using a slow-moving repetition speed of 4-6 seconds, really starting to feel yourself resisting gravity. You are likely to eventually feel lactic acid building up in the Back and Lower Traps even though you may can knock out lots of faster-paced efforts. The slower weight speed will definitely activate additional muscle fibre and prevent gravity and momentum lessening the overall performance of your Latissimus Dorsi and Levator Scapulae training.
Additional information: http://www.bodybuilding.com/exercises
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