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B De Witte

Publications and source records attributed to B De Witte.

5 recordsLinked to original sources
PubMed1986

Influence of ski materials on muscle activity.

The purpose of this study was to examine whether differences in construction between the compact ski, the racing ski and the soft ski influence the behavioural and electromuscular responses of the user. Eight qualified male ski instructors performed two 'shuss' trials and three different basic turns. Six muscles (M. biceps femoris, M. gastrocnemius lateralis and medialis, M. rectus femoris, M. vastus lateralis and M. tibialis anterior) were studied, using a conventional but portable electromyographic (EMG) registration with telemetric synchronization, active electrodes and a six-channel portable data recorder. Muscle contractions were continuously registered and visualized in raw EMG form and linear envelopes. The differences between the mean rectified EMG data of dynamic contractions while skiing and the mean rectified EMG data of the maximal voluntary contraction were used in the primary analysis of data, from which the participation levels of the muscles investigated could be calculated for each type of ski. Based on this comparison, differences between the effects on muscle activity of the three types of skis were unimportant. In a second phase, the normalized linear envelopes of all subjects were graphically superimposed and averaged. This was performed for each muscle, for each movement, for each leg and for each ski tested. The EMG data were considered in combination with anthropometric values, with snow characteristics and with the velocity of skiing. This study showed systematic differences between the use of the racing, soft and compact ski. On average the soft ski showed the lowest muscle activity patterns and thus the most economical muscular efforts for all muscles investigated and within all movements.

Adult↗
PubMedDate not supplied

An unusual case of blunt abdominal trauma: A bleeding and ruptured gall-bladder managed by laparoscopy.

An isolated gall-bladder injury after blunt abdominal trauma is rare. Intraluminal bleeding with a perforation and an intra-abdominal haemorrhage is even rarer. Early diagnosis is difficult, even with a CT-scan or an US-scan available. Clinical suspicion, serial clinical examination and repeated imaging, can prevent mortality and morbidity. We present a case where laparoscopy was used to diagnose and treat an isolated gall-bladder lesion after blunt abdominal trauma.

Abdominal Injuries↗