排序方式： 共有69条查询结果，搜索用时 46 毫秒
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Gary Kamen 《Research quarterly for exercise and sport》2013,84(3):238-244
Abstract An investigation was conducted to determine the effects of fatiguing exercise upon the Achilles tendon reflex. Eleven subjects performed one of four exercise tasks on each of four separate days. The exercise conditions involved low-intensity isometric, high-intensity isometric, low-intensity isotonic or high-intensity isotonic exercise. The low-intensity tasks required a 25% MVC load, while the high-intensity conditions required a 50% MVC load. Results showed that low-intensity isometric exercise reduced reflex force, as well as the time needed to reach peak force, while high-intensity exercise produced an enhancement of reflex force. Half-relaxation time was faster after subjects executed low-intensity isometric exercise, but generally somewhat prolonged following high-intensity isometric exercise. Thus, the Achilles tendon reflex may be either enhanced or depressed depending upon the type and intensity of exercise performed. 相似文献
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Loren Cordain Alan Tucker Debbie Moon Joel M. Stager 《Research quarterly for exercise and sport》2013,84(1):70-74
Abstract To determine whether respiratory muscle strength is related to pulmonary volume differences in athletes and nonathletes, 11 intercollegiate female swimmers, 11 female cross-country runners, and two nonathletic control groups, matched to the athletes in height and age, were evaluated for pulmonary parameters including maximal inspiratory pressure (Plmax) and maximal expiratory pressure (PEmax). Swimmers exhibited larger (p < .05) vital capacities (VC), residual lung volumes (RV), inspiratory capacities (IC), and functional residual capacities (FRC) than both the runners or the controls but no difference (p > .05) in either Plmax or inspiratory flow (FIV25%-75%). Timed expiratory volumes (FEV Q.5 m and FEV1.0 were significantly (p < .05) lower in the swimmers than in the controls. These data suggest that an adaptational growth may be responsible, in part, for the augmented static lung volumes demonstrated in swimmers 相似文献
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应用运动生物力学原理,对乒乓球运动中三种步法的足底压力进行分析,得到以下主要结论：乒乓球典型步法动作过程中双脚的足底压力主要承载区域集中在足前区,足中区受力不明显。击球发力脚足后区足底压力峰值交叉步步法最大,并步步法次之,跨步步法最小。前足中区为足前区较为稳定的主要受力区域,前足外侧区和前足内侧区所受足底压力峰值的大小与步法的动作形式有关。 相似文献
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Joseph M. Gonzales Andrew J. Galpin Melissa M. Montgomery 《Journal of sports sciences》2013,31(19):2184-2190
ABSTRACTWe examined the association between footfall pattern and characteristics of lower limb muscle function and compared lower limb muscle function between forefoot and rearfoot runners. Fifteen rearfoot and 16 forefoot runners were evaluated using ultrasonography of the gastrocnemii and tibialis anterior while strike index and heel strike angle quantified footfall pattern. Higher strike index was associated with lower medial gastrocnemius echo intensity (p = 0.05), lower lateral gastrocnemius echo intensity (p = 0.04), smaller tibialis anterior pennation angle (p = 0.05), and longer lateral gastrocnemius fascicle length (p = 0.04). Larger heel strike angle was associated with smaller medial gastrocnemius cross-sectional area (p = 0.04), shorter lateral gastrocnemius fascicle length (p < 0.01), and lower plantar flexion moment (p < 0.01). Larger plantar flexion moment was associated with lesser medial gastrocnemius echo intensity (p = 0.04), lesser lateral gastrocnemius echo intensity (p = 0.03), and greater lateral gastrocnemius fascicle length (p = 0.02). A smaller plantar flexion moment, larger heel strike angle, lower tibialis anterior echo intensity, larger tibialis anterior pennation angle, and smaller lateral gastrocnemius pennation angle were observed in rearfoot compared to forefoot runners (p < 0.05). Lower limb muscle architecture is associated with footfall pattern and ankle mechanics during running.Abbreviation: EMG: electromyographic; MG: medial gastrocnemius; LG: lateral gastrocnemius; TA: tibialis anterior; EI: echo intensity; CSA: cross-sectional area; PA: pennation angle; FL: fascicle length; FT: fat thickness 相似文献
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鞋跟高度在健身走过程中对足底压力的影响 总被引：1，自引：0，他引：1
采用F-scan足底压力分布解析系统,对青少年女性不同高度鞋跟情况下的健身走步态进行足底压力分布的测量与分析。结果表明：鞋跟高度的变化是影响青少年女性足底压力发生改变的主要原因;平跟鞋各个跖骨的压强一时间曲线为单峰型,而高跟鞋各个跖骨的压强一时间曲线是双峰型。提示：穿高跟鞋进行健身走对女性足部有一定的不利影响。 相似文献
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排球运动员步态支撑期的足底压力特征 总被引：1，自引：0，他引：1
通过测试得到排球运动员步态中足底压力的主要特征,并比较膝关节损伤运动员与无膝关节损伤运动员的足底压力特征,尝试分析膝关节损伤对足底压力产生的变化,为排球运动员正常步态数据提供可信的参考标准。选取北京体育大学竞技体育学院排球专项学生共48人(26男、22女)作为研究对象。运用FOOTSCAN足底压力分布测量系统和QUALISYS-MCU500红外运动测试系统的6个摄像头采集足底压力及步态基本运动学参数,测量被试者赤足状态下的步态。要求被试者以自己正常的步速行走,左右脚分别测试3次。将足部分为10个解剖分区:第L趾骨(T1)、第2-5趾骨(T2-T5)、第1跖骨(M1)、第2跖骨(M2)、第3跖骨(M3)、第4跖骨(M4)、第5跖骨(M5)、足中部(MF)、足跟内侧(HM)和足跟外侧(HL)。选取各个分区的接触开始时刻、接触结束时刻、最大压强时刻、接触时间作为时间指标。根据足底压力数据,男女排球运动员在步态支撑时期不同阶段的比例分别为:着地阶段(6.2%男,6.4%女)、前足接触阶段(5.5%男,6.6%女)、整足接触阶段(43.44%男,40.4%女)、离地阶段(42.9%男,46.5%女)。膝关节损伤运动员受伤腿足中部足底压强峰值明显低于未受伤腿。 相似文献
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借助足底压力测试系统,获得60名7岁男童静止站立和自然行走时足底压力分布特征,结果表明:无论是站立还是行走肥胖儿童在足底某些区域的足底压力、足地接触面积以及压强等要显著高于正常组,尤其是在足跟、足弓以及第3-5跖骨头处冲量变化和压强时间变化率也显著增高,这大大增加足病痛的风险。 相似文献
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7岁健康男童裸足行走足底压力分布特征研究 总被引：1，自引：0，他引：1
借助足底压力测试系统,获得20名7岁男童裸足行走时足底压力分布特征,结果表明：儿童足底压力曲线与成人略有区别,第2峰峰值略大于第1峰值,最大压力大部分出现在足跟,左右足表现压力表现出一定的差异性,足弓部位的着地面积偏大,且足趾部位着地面积相比偏小等特征。 相似文献