[Kinematic analysis of the spine during placement on 2 transfer devices: a spinal backboard and a scoop stretcher]. / Análisis cinemático de la columna vertebral durante la colocación de dos dispositivos de transferencia: tablero espinal frente a camilla de cuchara.

OBJECTIVES: To analyze and compare measurements of spine kinematics during prehospital emergency responders' placement of a patient on a spinal backboard or a scoop stretcher. MATERIAL AND METHODS: Cross sectional, quasi-experimental clinical simulation to compare misalignment (main endpoint) by means of data from a 3-dimensional motion capture system. RESULTS: Mean (SD) misalignment during placement on the 2 devices was 37.53° (14.15°). By device, mean misalignment was 31.08° (6.38°) for the scoop stretcher and 43.97° (7.97°) for the backboard (P=.048). CONCLUSION: Less misalignment occurs during placement on the scoop stretcher than on the spinal backboard.

OBJETIVO: Analizar y comparar la cinemática de la columna vertebral durante la colocación del tablero espinal (TE) y de la camilla de cuchara (CC) en una situación simulada realizada por expertos en emergencias prehospitalarias. METODO: Estudio transversal, cuasiexperimental, de simulación clínica para comparar la desalineación (variable principal), mediante un sistema de captura de movimiento en 3 dimensiones. RESULTADOS: Los resultados obtenidos en la desalineación media durante la colocación de los dispositivos fueron de 37,53°: 31,08° (6,38) para la CC y de 43,97° (7,97) para el TE (p = 0,048). CONCLUSIONES: La colocación de la camilla de cuchara provoca menos desalineación que el tablero espinal.

Análisis cinemático de la columna vertebral durante la colocación de dos dispositivos de transferencia: tablero espinal frente a camilla de cuchara / Kinematic analysis of the spine during placement on 2 transfer devices: a spinal backboard and a scoop stretcher

Objetivos: Analizar y comparar la cinemática de la columna vertebral durante la colocación del tablero espinal (TE) y de la camilla de cuchara (CC) en una situación simulada realizada por expertos en emergencias prehospitalarias. Método: Estudio transversal, cuasiexperimental, de simulación clínica para comparar la desalineación (variable principal), mediante un sistema de captura de movimiento en 3 dimensiones. Resultados: Los resultados obtenidos en la desalineación media durante la colocación de los dispositivos fueron de 37,53°: 31,08° (6,38) para la CC y de 43,97° (7,97) para el TE (p = 0,048). Conclusiones: La colocación de la camilla de cuchara provoca menos desalineación que el tablero espinal (AU)

Objective: To analyze and compare measurements of spine kinematics during prehospital emergency responders’ placement of a patient on a spinal backboard or a scoop stretcher. Methods: Cross sectional, quasi-experimental clinical simulation to compare misalignment (main endpoint) by means of data from a 3 dimensional motion capture system. Results: Mean (SD) misalignment during placement on the 2 devices was 37.53° (14.15°). By device, mean misalignment was 31.08° (6.38°) for the scoop stretcher and 43.97° (7.97°) for the backboard (P=.048). Conclusion: Less misalignment occurs during placement on the scoop stretcher than on the spinal backboard (AU)

Interrelationships between different loads in resisted sprints, half-squat 1 RM and kinematic variables in trained athletes.

Resisted sprint running is a common training method for improving sprint-specific strength. It is well-known that an athlete's time to complete a sled-towing sprint increases linearly with increasing sled load. However, to our knowledge, the relationship between the maximum load in sled-towing sprint and the sprint time is unknown, The main purpose of this research was to analyze the relationship between the maximum load in sled-towing sprint, half-squat maximal dynamic strength and the velocity in the acceleration phase in 20-m sprint. A second aim was to compare sprint performance when athletes ran under different conditions: un-resisted and towing sleds. Twenty-one participants (17.86 ± 2.27 years; 1.77 ± 0.06 m and 69.24 ± 7.20 kg) completed a one repetition maximum test (1 RM) from a half-squat position (159.68 ± 22.61 kg) and a series of sled-towing sprints with loads of 0, 5, 10, 15, 20, 25, 30% body mass (Bm) and the maximum resisted sprint load. No significant correlation (P<0.05) was found between half-squat 1 RM and the sprint time in different loaded conditions. Conversely, significant correlations (P<0.05) were found between maximum load in resisted sprint and sprint time (20-m sprint time, r=-0.71; 5% Bm, r=-0.73; 10% Bm, r=-0.53; 15% Bm, r=-0.55; 20% Bm, r=-0.65; 25% Bm, r=-0.44; 30% Bm, r=-0.63; MaxLoad, r= 0.93). The sprinting velocity significantly decreased by 4-22% with all load increases. Stride length (SL) also decreased (17%) significantly across all resisted conditions. In addition, there were significant differences in stride frequency (SF) with loads over 15% Bm. It could be concluded that the knowledge of the individual maximal load in resisted sprint and the effects on the sprinting kinematic with different loads, could be interesting to determinate the optimal load to improve the acceleration phase at sprint running.