Abstract：
:This study investigated fatigue-induced changes in spring-mass model characteristics during repeated running sprints. Sixteen active subjects performed 12 × 40 m sprints interspersed with 30 s of passive recovery. Vertical and anterior-posterior ground reaction forces were measured at 5-10 m and 30-35 m and used to determine spring-mass model characteristics. Contact (P < 0.001), flight (P < 0.05) and swing times (P < 0.001) together with braking, push-off and total stride durations (P < 0.001) lengthened across repetitions. Stride frequency (P < 0.001) and push-off forces (P < 0.05) decreased with fatigue, whereas stride length (P = 0.06), braking (P = 0.08) and peak vertical forces (P = 0.17) changes approached significance. Center of mass vertical displacement (P < 0.001) but not leg compression (P > 0.05) increased with time. As a result, vertical stiffness decreased (P < 0.001) from the first to the last repetition, whereas leg stiffness changes across sprint trials were not significant (P > 0.05). Changes in vertical stiffness were correlated (r > 0.7; P < 0.001) with changes in stride frequency. When compared to 5-10 m, most of ground reaction force-related parameters were higher (P < 0.05) at 30-35 m, whereas contact time, stride frequency, vertical and leg stiffness were lower (P < 0.05). Vertical stiffness deteriorates when 40 m run-based sprints are repeated, which alters impact parameters. Maintaining faster stride frequencies through retaining higher vertical stiffness is a prerequisite to improve performance during repeated sprinting.
journal_name
Eur J Appl Physioljournal_title
European journal of applied physiologyauthors
Girard O,Micallef JP,Millet GPdoi
10.1007/s00421-010-1638-9subject
Has Abstractpub_date
2011-01-01 00:00:00pages
125-34issue
1eissn
1439-6319issn
1439-6327journal_volume
111pub_type
杂志文章abstract：:This study tested the hypothesis that changes in indirect markers of muscle damage following maximal eccentric exercise would be smaller for the knee extensors (KE) and flexors (KF) compared with the elbow flexors (EF) and extensors (EE). A total of 17 sedentary men performed five sets of six maximal isokinetic (90° s...
journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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更新日期：2011-02-01 00:00:00
abstract：:Falls from heights resulting from a loss of balance are a major concern in the occupational setting. Previous studies have documented a deleterious effect of lower extremity fatigue on balance. The purpose of this study was to investigate the effect of lumbar extensor fatigue on balance during quiet standing. Addition...
journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
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journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章
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更新日期：2003-09-01 00:00:00
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journal_title：European journal of applied physiology
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：European journal of applied physiology
pub_type： 杂志文章
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更新日期：2019-04-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
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更新日期：2005-12-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
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journal_title：European journal of applied physiology
pub_type： 临床试验,杂志文章,随机对照试验
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journal_title：European journal of applied physiology
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journal_title：European journal of applied physiology
pub_type： 杂志文章
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journal_title：European journal of applied physiology
pub_type： 杂志文章
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-008-0855-y
更新日期：2008-12-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00421-007-0424-9
更新日期：2007-06-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
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更新日期：2007-03-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-007-0414-y
更新日期：2007-05-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-020-04445-y
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journal_title：European journal of applied physiology
pub_type： 杂志文章
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journal_title：European journal of applied physiology
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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更新日期：2017-10-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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journal_title：European journal of applied physiology
pub_type： 杂志文章
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更新日期：2002-06-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-011-2091-0
更新日期：2012-04-01 00:00:00
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journal_title：European journal of applied physiology
pub_type： 杂志文章,随机对照试验
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journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/PL00013792
更新日期：2000-01-01 00:00:00
abstract：PURPOSE:This study aimed to determine whether men and women display a different magnitude of muscle fatigue in response to high-load (HL) and low-load blood flow-restricted (LLBFR) elbow-flexion exercise. We also explored to which extent both exercise protocols induce similar levels of muscle fatigue (i.e., torque decr...
journal_title：European journal of applied physiology
pub_type： 杂志文章
doi：10.1007/s00421-018-3940-x
更新日期：2018-10-01 00:00:00
abstract：:Low bone mineral density (BMD) is established as a primary predictor of osteoporotic risk and can also have substantial implications for athlete health and injury risk in the elite sporting environment. BMD is a highly multi-factorial phenotype influenced by diet, hormonal characteristics and physical activity. The in...
journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
doi：10.1007/s00421-018-4007-8
更新日期：2019-01-01 00:00:00
abstract：:This review discusses brain temperature as a physiological parameter, which is determined primarily by neural metabolism, regulated by cerebral blood flow, and affected by various environmental factors and drugs. First, we consider normal fluctuations in brain temperature that are induced by salient environmental stim...
journal_title：European journal of applied physiology
pub_type： 杂志文章,评审
doi：10.1007/s00421-007-0450-7
更新日期：2007-09-01 00:00:00
