The muscular response on the main muscles of the propulsive phase of the upper limb in crawl has been evaluated by tensiomyography (TMG), which was carried out through three parameters: activation time (Td), contraction time (Tc) and maximum deformation (Dm).

The objective of this study is to evaluate the hypothesis of changes produced between lactic resistance training with passive rest and lactic resistance training with active rest.

For this, thirty swimmers participated, with an average age of 20 years.

Inclusion Criteria:

• Be between 18 and 25 years old.
• have a minimum mark or have participated by ranking in a crawl event in the territorial championship of Madrid in the current season belong.
• to the male gender.

Exclusion Criteria:

• subjects who did not meet the minimum age and did not obtain the minimum mark and did not sign the informed consent.

male swimmers from 18 to 25 years old with a minimum mark who swimming a croll style