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Influence of ski materials on muscle activity

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CONTRIBUTORS:
  Author Clarys, J. P.
  Author van-Puymbroeck, L.
  Author Publie, J.
  Author Bollens, E.
  Author Cabri, J.
  Author de-Witte, B.
JOURNAL:
  Journal of Sports Sciences (JSS), ??( 4), ?? - ??.
YEAR: 1986
PUB TYPE: Journal Article
SUBJECT(S): SKIING; SKIS; CONSTRUCTION; TESTING; MUSCLE-CONTRACTION; ELECTROMYOGRAPHY
DISCIPLINE: No discipline assigned
HTTP:
LANGUAGE: English
PUB ID: 103-366-234 (Last edited on 2002/02/27 18:45:02 US/Mountain)
SPONSOR(S):
 
ABSTRACT:
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 to the user. Eight qualified male ski instructors performed two `shuss` trials and three different basic turns. Six muscles were studied, using a conventional but portable electromyographic (EMG) registration with telemetric synchronization, active electrodes and a six-channel portable data recorder. 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.
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