کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8263210 | 1534871 | 2015 | 38 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sex differences with aging in the fatigability of dynamic contractions
ترجمه فارسی عنوان
اختلاف سنی با پیری در خستگی انقباضات پویا
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کلمات کلیدی
TMSMmaxMVICMEPSITRPEEMG - الکترومیوگرافیelectromyography - الکترومیوگرافیTranscranial magnetic stimulation - تحریک مغناطیسی مغزanalysis of variance - تحلیل واریانسANOVA - تحلیل واریانس Analysis of varianceGender - جنسیتmaximal voluntary isometric contraction - حداکثر انقباض دائمی ایزومتریکMuscle fatigue - خستگی عضلانیContractile properties - خواص ضدقارچیrating of perceived exertion - رتبه بندی تمرین درک شدهWomen - زنAging - سالخوردگیMotor evoked potential - موتور، پتانسیل را نشان می دهدM wave - موج مcompound muscle action potential - پتانسیل عمل عضله مرکب
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
سالمندی
چکیده انگلیسی
This study determined the sex difference with aging in fatigability of the elbow flexor muscles during a dynamic fatiguing task, and explored the associated mechanisms. We compared fatigability of the elbow flexor muscles in 18 young (20.2 ± 1 years: 9 men) and 36 old adults (73.5 ± 1 years: 16 men) during and in recovery from repeated dynamic contractions (~ 60°/s) with a load equivalent to 20% of maximal voluntary isometric contraction (MVIC) torque until failure. Transcranial magnetic stimulation (TMS) was used to assess supraspinal fatigue (an increase in the superimposed twitch, SIT) and the peak rate of muscle relaxation. Time to failure was briefer for the men than the women (6.1 ± 2.1 vs. 9.7 ± 5.5 min, respectively; P = 0.02) with no difference between young and old adults (7.2 ± 2.9 vs. 8.4 ± 5.2 min, respectively, P = 0.45) and no interaction (P > 0.05). The relative decline in peak relaxation rate with fatigability was similar for young and old adults (P = 0.11), but greater for men than women (P = 0.046). Supraspinal fatigue increased for all groups and was associated with the time to failure (P < 0.05). Regression analysis however, indicated that the time to failure was best predicted by the peak relaxation rate (baseline values and slowing with fatigability) (r2 = 0.55). Rate-limiting contractile mechanisms (e.g. excitation-contraction coupling) were responsible for the increased fatigability of the elbow flexors of men compared with women for a dynamic fatiguing task of slow angular velocity, and this sex difference was maintained with aging. The age difference in fatigability for the dynamic task was diminished for both sexes relative to what is typically observed with isometric fatiguing contractions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Gerontology - Volume 70, October 2015, Pages 1-10
Journal: Experimental Gerontology - Volume 70, October 2015, Pages 1-10
نویسندگان
Tejin Yoon, Ryan Doyel, Claire Widule, Sandra K. Hunter,