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Biomedical subjects

P Bessou

Publications and source records attributed to P Bessou.

71 records · Page 4Linked to original sources
PubMedDate not supplied

Spectral frequency analysis of dynamic balance in healthy and injured athletes.

Different neurophysiological circuits underlie the various frequencies of the body sway for the regulation of human upright posture. Servo-controlled platforms allowed experimental studies about latency responses after a sudden external disturbance but power frequency repartition during spontaneous dynamic equilibrium has rarely been examined. The purpose of the present study was to examine the zone of sway frequency assigned to proprioceptive afferences from muscular, articular and tendinous receptors in healthy and injured subjects standing on an unstable and minimal area. Dynamic balance conditions were realized by asking athletes to stand up on a seesaw (stabilometer). The recordings (stabilograms) were monitored by means of an accelerometer. Their power spectra were obtained by a fast Fourier transform process. A first study was conducted in order to specify the contribution of articular receptors of the ankle in the regulation of spontaneous dynamic equilibrium of five soccer players with unilateral injured ankle (IA). The balance parameters in lateral sways were measured in monopodal stance on the healthy ankle (HA) comparatively to IA. The stabilogram was longer (P < 0.05), the total energy of 2-20 Hz band (P < 0.01) higher in the IA (1074 +/- 111 mm and 53 +/- 8 V2) than in the HA (836 +/- 150 mm and 36 +/- 8 V2). A second study analyzed the contribution of knee articular receptors involved in the reflexes of antigravity extension. We assessed during bipodal stance the anteroposterior sways of five basketball players with injured knee (IK) and 3 with healthy knee (HK) in eyes-open and eyes-closed situations.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMedDate not supplied

Simultaneous recording of longitudinal displacements of both feet during human walking.

1. Recordings of longitudinal displacements of both feet have been performed by linking each foot to a length-voltage transducer by means of threads. The movement transmitted to the transducer was reduced by winding the thread around a sixteen strand pulley block. 2. The aspect of the displacement curves allows a direct analysis of the walk. Some typical curves of normal and pathological gaits are presented. Graphic measurements done on several right and left cycles of a 6 m walk episode in 50 adult subjects provided data to determine the mean and the standard deviation of spatial and temporal parameters of the walk. 3. An advantage of this method is to permit the measurement of the parameters of several successive cycles of both sides and so to detect changes in the length, the duration and the velocity of successive cycles of the same foot and of alternated cycles of both feet. This being important to characterize pathological gaits.

Adult↗
PubMedDate not supplied

Direct emergence of the dorsospinal artery from the aorta supplying the anterior spinal artery: report of two cases.

We report two cases of an isolated dorsospinal artery that emerged directly from the aorta to supply the anterior spinal artery, which in one case had another blood supply on the opposite side, in a lower position. It is important to identify this anatomic variant, otherwise spinal angiography might be incomplete, especially when the isolated dorsospinal artery supplies the anterior spinal artery.

Adult↗