Abstract：
:The purpose of this study was to provide electromyographic feedback for (1) pedagogical advice in motor learning, (2) the ergonomics of materials choice and (3) competition. For these purposes: (1) EMG data were collected for the Stem Christie, the Stem Turn and the Parallel Christie (three basic ski initiation drills) and verified for the complexity of patterns; (2) integrated EMG (iEMG) and linear envelopes (LEs) were analysed from standardized positions, motions and slopes using compact, soft and competition skis; (3) in a simulated 'parallel special slalom', the muscular activity pattern and intensity of excavated and flat snow conditions were compared. The EMG data from the three studies were collected on location in the French Alps (Tignes). The analog raw EMG was recorded on the slopes with a portable seven-channel FM recorder (TEAC MR30) and with pre-amplified bipolar surface electrodes supplied with a precision instrumentation amplifier (AD 524, Analog Devices, Norwood, USA). The raw signal was full-wave rectified and enveloped using a moving average principle. This linear envelope was normalized according to the highest peak amplitude procedure per subject and was integrated in order to obtain a reference of muscular intensity. In the three studies and for all subjects (elite skiers: n = 25 in studies 1 and 2, n = 6 in study 3), we found a high level of co-contractions in the lower limb extensors and flexors, especially during the extension phase of the ski movement. The Stem Christie and the Parallel Christie showed higher levels of rhythmic movement (92 and 84%, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
J Sports Scijournal_title
Journal of sports sciencesauthors
Clarys JP,Publie J,Zinzen Edoi
10.1080/02640419408732169subject
Has Abstractpub_date
1994-06-01 00:00:00pages
243-50issue
3eissn
0264-0414issn
1466-447Xjournal_volume
12pub_type
杂志文章abstract：:This study aimed to investigate the effects of different training modalities on the soluble Klotho (S-Klotho) plasma levels in sedentary middle-aged adults. A total of 74 middle-aged adults (53.4 ± 5.0 years old; 52.7% women) were enrolled in the FIT-AGEING study. We conducted a 12-week randomised controlled trial. Th...
journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
doi：10.1080/02640414.2019.1626048
更新日期：2019-10-01 00:00:00
abstract：:Concerns about the value of physical testing and apparently declining test performance in junior basketball players prompted this retrospective study of trends in anthropometric and fitness test scores related to recruitment age and recruitment year. The participants were 1011 females and 1087 males entering Basketbal...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410600907870
更新日期：2007-06-01 00:00:00
abstract：:The International Paralympic Committee (IPC) and individual sports federations have established the need to develop evidence-based systems of classification for athletes with vision impairment (VI) that may differ depending on the visual demands of each sport. As a consequence, research has been conducted that led to ...
journal_title：Journal of sports sciences
pub_type： 杂志文章
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更新日期：2020-12-15 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2013.773401
更新日期：2013-01-01 00:00:00
abstract：:Drug abuse by adolescents has been investigated in various surveys that reported correlations between age, gender, and activity. However, none of these studies included chemical analyses to help substantiate the statements of participants. In the present study, the urine specimens of 964 students (439 females, 525 mal...
journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410801910293
更新日期：2008-08-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/026404199365551
更新日期：1999-09-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2014.977935
更新日期：2015-01-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2020.1747828
更新日期：2020-07-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2018.1469226
更新日期：2018-11-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
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更新日期：2017-09-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2017.1375139
更新日期：2018-06-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640410600598315
更新日期：2007-01-15 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2020.1773613
更新日期：2020-09-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2016.1184299
更新日期：2017-04-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2020.1736247
更新日期：2020-04-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章,评审
doi：10.1080/02640414.2018.1547099
更新日期：2019-05-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2014.889847
更新日期：2014-01-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 临床试验,杂志文章,随机对照试验
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更新日期：2000-05-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2012.753155
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journal_title：Journal of sports sciences
pub_type： 临床试验,杂志文章
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journal_title：Journal of sports sciences
pub_type： 杂志文章
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更新日期：2014-01-01 00:00:00
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journal_title：Journal of sports sciences
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更新日期：2019-07-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
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更新日期：2007-09-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 临床试验,杂志文章
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更新日期：2005-03-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
doi：10.1080/02640414.2017.1407033
更新日期：2018-07-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
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更新日期：1998-01-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章,随机对照试验
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更新日期：2019-03-01 00:00:00
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journal_title：Journal of sports sciences
pub_type： 杂志文章
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更新日期：2019-11-01 00:00:00
abstract：:Using a two-study approach, we examined a methodology for objectively depicting team performance and form in a professional rugby union side. Study 1 developed standardized indicators to examine a team's performance in a single match relative to their previous matches over a domestic season via a performance report an...
journal_title：Journal of sports sciences
pub_type： 杂志文章
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