Abstract:
INTRODUCTION:This study examined the effects of long-term bed rest with or without a concurrent resistance exercise protocol on different muscle function indices of the knee extensors and their influence on previously shown atrophy, neural impairment, and slow-to-fast phenotype shift. METHODS:Nine men underwent 90 d of bed rest only (BR), while eight men in addition performed maximal supine squats every third day (BRE). Before and at day 1 and 5 following bed rest, surface quadriceps electromyographic (EMG) activity was measured during a sustained (60-s) submaximal isometric action and rate of force development (RFD) was assessed during a maximal isometric action, both in the supine squat position. Maximal torque was measured during isokinetic knee extensions at different angular velocities before and after (day 2 and 11) bed rest. RESULTS:EMG amplitude at a fixed submaximal load increased in BR, but not in BRE. The increase in amplitude during the sustained action was elevated in BR but not in BRE. RFD decreased in BR; this effect was attenuated day 1 and normalized day 5 in BRE. RFD expressed relative to maximal force was maintained in both groups. Angle-specific torque decreased equally for all velocities in BR. The decrease in isokinetic strength was attenuated day 2 in BRE. DISCUSSION:Phenotype changes were not reflected in muscle function measurements, probably because they were overridden by the effects of atrophy and neural adaptation. The protective effect of resistance exercise was more pronounced in tasks similar to the training action, inferring great impact of neural mechanisms. Alkner BA, Norrbrand L, Tesch PA. Neuromuscular adaptations following 90 days bed rest with or without resistance exercise. Aerosp Med Hum Perform. 2016; 87(7):610-617.
journal_name
Aerosp Med Hum Performjournal_title
Aerospace medicine and human performanceauthors
Alkner BA,Norrbrand L,Tesch PAdoi
10.3357/AMHP.4383.2016subject
Has Abstractpub_date
2016-07-01 00:00:00pages
610-7issue
7eissn
2375-6314issn
2375-6322journal_volume
87pub_type
杂志文章abstract:INTRODUCTION:Hypoxia caused by high altitude exposure can impair cerebral and mental functions. Blood flow and oxygenation of the buccal tissue can be reliable markers to detect hypoxia. In this study, near infrared spectroscopy was used in combination with a novel optical probe to evaluate the applicability of the nov...
journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.4510.2016
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journal_title:Aerospace medicine and human performance
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章,评审
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.5142.2018
更新日期:2018-12-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.4728.2017
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章,评审
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.4993.2018
更新日期:2018-01-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.5416.2019
更新日期:2019-10-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章,随机对照试验
doi:10.3357/AMHP.4768.2017
更新日期:2017-07-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.5029.2018
更新日期:2018-07-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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更新日期:2019-01-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.4889.2017
更新日期:2017-11-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.4312.2015
更新日期:2015-12-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章,随机对照试验
doi:10.3357/AMHP.4761.2017
更新日期:2017-10-01 00:00:00
abstract::INTRODUCTION: Visual performance is important for safe and accurate taxiing operations. Visibility is associated with navigation errors during taxiing. The main objective of the present study was to investigate the effects of visibility on pilots' fixation patterns during taxiing. The interaction between visibility an...
journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
doi:10.3357/AMHP.4828.2018
更新日期:2018-04-01 00:00:00
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journal_title:Aerospace medicine and human performance
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更新日期:2020-04-01 00:00:00
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journal_title:Aerospace medicine and human performance
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更新日期:2015-05-01 00:00:00
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journal_title:Aerospace medicine and human performance
pub_type: 杂志文章
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更新日期:2018-09-01 00:00:00
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journal_title:Aerospace medicine and human performance
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更新日期:2020-10-01 00:00:00
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journal_title:Aerospace medicine and human performance
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