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Application of the neuromuscular fatigue threshold treadmill test to muscles of the quadriceps and hamstrings

Journal of Sport and Health Science 2020年第6期9卷 628-633页

作者： clayton l.camic Attila J.Kovacs Trisha A.VanDusseldorp Ethan C.Hill Evan A.Enquist Human Performance laboratory Exercise and Sport ScienceUniversity of Wisconsin-La CrosseLa CrosseWisconsin 54601USA Department of Exercise Science and Sport Management Kennesaw State UniversityKennesawGeorgia 30144USA Department of Nutrition and Health Sciences University of Nebraska-LincolnLincolnNebraska 68583USA Department of Kinesiology University of AlabamaTuscaloosaAlabama 35487USA

Purpose:The purposes of the present study were:(1)to determine whether the physical working capacity at the fatigue threshold(PWCFT)model that has been used for estimating the onset of neuromuscular fatigue in the vastus lateralis(Vl)during incremental treadmill running could also be applied to the vastus medialis(VM),biceps femoris(BF),and semitendinosus(ST)muscles;and(2)if applicable,to compare the running velocities associated with the PWCFT among these ***:Eleven subjects(age 21.7±1.8 years)performed an incremental treadmill test to exhaustion with electromyographic signals recorded from the Vl,VM,BF,and ***:The results indicated there were no significant(p>0.05)mean differences in the running velocities associated with the PWCFT for the Vl(14.4±2.0 km/h),VM(14.3±1.9 km/h),BF(13.8±1.8 km/h),and ST(14.7±2.3 km/h).In addition,there were significant inter-correlations(r=0.68-0.88)among running velocities associated with the PWCFT of each *** results also indicated that 9 of the 11 subjects exhibited identical PWCFT values for at least 3 of the 4 muscles,but there were no uniform patterns for any intra-individual ***:The findings of the present study suggested that the PWCFT test is a viable method to identify neuromuscular fatigue in the quadriceps and hamstrings during incremental treadmill exercise and results in consistent PWCFT values among these muscles.

关键词： EMG amplitude Muscle activation PWCFT

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Kinetics of uranium extraction from coffinite——A comparison with other common uranium minerals

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Transactions of Nonferrous Metals Society of China 2018年第10期28卷 2135-2142页

作者： H.S.REYNOlDS R.RAM M.I.POWNCEBY Y.YANG M.CHEN J.TARDIO l.JONES S.K.BHARGAVA Centre for Advanced Materials and Industrial Chemistry(camic) School of Applied SciencesRMIT UniversityGPO Box 2476Melbourne VIC 3001Australia School of Earth Atmosphere and Environment Monash University9 Rainforest WalkClaytonVictoria 3800Australia CSIRO Mineral Resources Private Bag 10 Clayton SouthVictoria 3169Australia

A synthetic coffinite was hydrothermally prepared and characterized before conducting a series of acid sulfate leach tests under conditions of relevance to uranium *** results were then compared with similar studies on synthetic versions of the related U4+minerals uraninite(UO2)and brannerite(UTi2O6)to identify and differentiate the rate and U extraction among these important uranium *** examining the influence of residence time on uranium dissolution from synthetic coffinite,uraninite and brannerite showed that under similar experimental conditions,complete dissolution of uranium from coffinite was obtained between 36 and 48 *** activation energy for this reaction was calculated to be 38.4 kJ/*** represented a significantly slower rate of dissolution than that indicated for uraninite which dissolved in 3 h(Ea=15.2 kJ/mol).The synthetic brannerite was leached at a much slower rate than the coffinite and reached a maximum dissolution of^18%U in 144 h(Ea=42-84 kJ/mol).The clear differentiation in rates and U extraction among the three minerals is consistent with previous literatures which suggest that in terms of leachability,uraninite>coffinite>*** is expected that the presence of impurities in natural coffinites would further inhibit leachability.

关键词： coffinite uraninite brannerite acid leaching extraction kinetics

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