Kinematic,kinetic and EMG analysis of four front crawl flip turn techniques

This study aimed to analyse the kinematic, kinetic and electromyographic characteristics of four front crawl flip turn technique variants. The variants distinguished from each other by differences in body position (i.e. dorsal, lateral, ventral) during rolling, wall support, pushing and gliding phases. Seventeen highly trained swimmers (17.9 ± 3.2 years old) participated in interventional sessions and performed three trials of each variant, being monitored with a 3-D video system, a force platform and an electromyography (EMG) system. Studied variables: rolling time and distance, wall support time, push-off time, peak force and horizontal impulse at wall support and push-off, centre of mass horizontal velocity at the end of the push-off, gliding time, centre of mass depth, distance, average and final velocity during gliding, total turn time and electrical activity of Gastrocnemius Medialis, Tibialis Anterior, Biceps Femoris and Vastus Lateralis muscles. Depending on the variant, total turn time ranged from 2.37 ± 0.32 to 2.43 ± 0.33 s, push-off force from 1.86 ± 0.33 to 1.92 ± 0.26 BW and centre of mass velocity during gliding from 1.78 ± 0.21 to 1.94 ± 0.22 m · s^?1. The variants were not distinguishable in terms of kinematical, kinetic and EMG parameters during the rolling, wall support, pushing and gliding phases.     

Network therapy using videotape disclosures for adult sexual abuse survivors.

Treatment of childhood sexual abuse survivors may be enhanced by a technique designed to generate a therapeutic constituency for the survivor around the disclosure of childhood abuse experiences. The need for validating relationships is hypothesized as a condition for successful treatment. The videotaped disclosure process proceeds in five stages: (1) Deciding to make a tape, (2) making a videotape following a semistructured interview format, (3) the patient viewing the tape, (4) showing the tape to potential therapeutic team members, and (5) possibly using the tape for a confrontation with the abuser. The technique has been used on 27 cases. Case histories are given to illustrate the procedure. Discussion includes potential mechanisms of action and issues in treatment that arise with the use of the method described.