Biomedical subjects

A Plamondon

Publications and source records attributed to A Plamondon.

21 records · Page 2Linked to original sources

PubMed1988

Application of a stereoradiographic method for the study of intervertebral motion.

A technique of three-dimensional reconstruction along with a method of adjusting anatomic landmarks were used to evaluate movements of the lumbar vertebrae of living subjects. Altogether, 16 subjects took part in the experiment. Each subject was radiographed in an upright standing position, and in each of the following positions: flexion, extension, axial rotation, and lateral bending. The results of the three-dimensional reconstruction procedures and the correction of anatomic landmarks show an adequate level of accuracy for experimentation with living subjects. The mean relative displacements of lumbar vertebrae in rotation are 10 degrees of flexion, 3 degrees of extension, 5 degrees of lateral bending, and 1 degree of axial rotation.

Adult↗

PubMed1984

[Influence of bandages on the strength of impact of punches in boxing].

In boxing, a punch can be directed to the head or the torso of the opponent; however, because of the gravity of the ensuing injuries, the limit of tolerance of the head and face to repeated impacts (Gurjian, 1955, 1962; Patrick, 1955; Hodgson and Nakamura, 1968) is particularly important to keep in mind. The objective of this research was to compare the impact forces which could be attained barehand versus those obtained with different types of bandages made up of gauze and diachylon. For the purpose of this study, 22 boxers were selected. The impact force was measured with a Kistler force plate, covered with a synthetic mattress. A system of photoelectric cells was used to measure the velocity of the punch. Each boxer had to impact the target with 10 punches while his hand was covered with one of four types of bandages as well as barehand. This study has shown that the bandaged hand increases significantly the impact force of the punch. The force increases in relation to the thickness of the bandage. The use of additional pieces of diachylon has a greater influence than gauzes. Therefore, it can be concluded that the bandaging increases the rigidity of the hand and facilitates the transfer of the force in comparison to a similar punch without a bandage or with a thinner one.

Adolescent↗

PubMed1984

[Kinematics and kinetics of sprint acceleration].

The kinematic and dynamic characteristics of the sprint of ten (10) male athletes are presented. A Kistler force plate was used to record the following dynamic variables: force, impulse and their duration. A Photosonic, cinecamera was used to obtain the following parameters: stride length and frequency, duration of the different phases and trunk angular measures during certain phases of the running stride. This study has shown that the majority of the kinematic and kinetic factors measured are closely associated with the variation of velocity during the first 18 strides of a sprint. Moreover, two factors account for 80% of the variance in running velocity, the first one being related to the breaking phase and the second to the duration of the support phase. It was also found that the modification of sprint velocity was especially influenced by stride length and frequency. However sprint acceleration was mostly sensitive to the relative duration of the support phase.

Biomechanical Phenomena↗