人体坐姿上肢不同拉力负荷时足底的压力分布

背景：足底压力测量技术已广泛应用于生物力学的步态研究,但多数研究都集中在正常行走或穿各种鞋时的步态时间特征和足底压力分布方面。 目的：探讨人体坐姿条件下上肢在不同拉力负荷过程中足底压力分布的特征。 方法：应用Seat 16/53 mFLEX足底压力测试系统记录40名健康受试者以坐姿在不同拉力负荷条件下的足底压力分布信号,分析在30%,50%,80%,100%最大随意肌力的拉力负荷下,不同年龄及不同性别受试者足底压力的分布。 结果与结论：在不同的拉力负荷下,青年组男性受试者的足底压力值明显大于女性(P < 0.05),而中年组男性和女性的足底压力值间差异无显著性意义(P> 0.05)。同时,所有受试者均表现出左右足底受力不均一的现象。其中,青年组男性右脚足底压力明显小于左脚,而青年组女性均显示出右脚足底压力大于左脚的情况(P< 0.05)。中年组男性和女性左脚的足底压力在30%~80%最大随意肌力拉力负荷下变化不大,但在100%最大随意肌力拉力负荷下明显减小(P < 0.05)。说明年龄和性别对不同拉力负荷下人体足底压力均有影响。     

两种治疗Ⅲb期月骨坏死术式的生物力学比较

目的 观察两种治疗Ⅲb期月骨坏死术式中腕关节桡舟、桡月关节间隙的生物力学变化,为临床治疗Kienbfck＆#39;s病提供生物力学依据.方法 选用成人新鲜冷冻上肢标本18侧,随机分为3组：正常腕关节组（A组）,舟骨、大小多角融合术组（B组）,头状骨、舟骨融合术组（C组）.在标本腕关节桡舟、桡月间隙处放置触觉压力传感器,将标本的近、远端分别固定在双轴液压材料测试系统（MTS）机上,与电脑I-scan压力测量系统连接,动态记录腕关节在中立位时各标本在100 N压力下、20 s内桡舟、桡月关节面间隙单位面积压力值.观察2种术式对腕关节桡舟、桡月关节间隙生物力学方面的影响.结果 腕关节中立位下,A组桡舟关节间负荷为（41.39 ± 6.93） N/cm2,桡月关节间负荷为（39.22±6.61） N/cm2;B组桡舟关节间负荷为（83.89±11.27） N/cm2,桡月关节间负荷为（22.55±11.27） N/cm2;C组桡舟关节间负荷为（86.45±8.10） N/cm2,桡月关节间负荷为（34.11±8.10）N/cm2.A组在腕中立位下,通过桡舟、桡月关节间隙的平均负荷十分均匀（P＞0.05）.B组和C组桡月关节间隙平均负荷均小于A组（P值均＜0.05）,而桡舟关节间隙平均负荷均明显大于A组（P值均＜0.05）,且B组桡月间隙平均负荷减少的更明显.结论 舟骨、大小多角融合术和头状骨、舟骨融合术均可使桡月间隙的受力得到明显缓解,且舟骨、大小多角骨融合术能更加有效地减轻月骨的负荷;在治疗Ⅲb期Kienbtock＆#39; s病的两种术式中,舟骨、大小多角融合术优于头状骨、舟骨融合术.     

重心移动式步行矫形器后钢缆的生物力学测试

目的探讨重心移动式步行矫形器(RGO)后钢缆的生物力学性能.方法使用S型拉力传感器测试18位完全性脊髓损伤(SCI)病人配戴RGO行走时对后钢缆的拉力,并用关节角度计测量其行走时的髋关节摆动范围,取其均数作为力学测试的参考值.利用生物力学测试机(MTS 858)参照此力学参考值,模拟步行周期对3组18件RGO样品的后钢缆固定螺丝进行疲劳实验,对所得数据进行统计学分析.结果损伤平面在T4～T12之间的完全性SCI患者在行走时对RGO后钢缆所产生的拉力,随体重的增加而递增.两者之间存在正相关;18例病人的髋关节平均摆动范围是(19.56±1.69).;3组样品RGO的后钢缆同定螺丝疲劳至断裂的平均次数分别为95450±2636、127171±27194及204620±7148(次),每组断裂次数平均值的上、下限值范围分别为92684＜μ＜98216、100756＜μ＜153586和196405＜μ＜212835,各组之间均有统计学差异(P2＜0.01).结论国产RGO的后钢缆固定螺丝是其相对薄弱环节;体重在55 kg以下、55～70 kg及70 kg以上的SCI患者,在配戴RGO行走分别达到各自相应步数之前,应及时更换其后钢缆的固定螺丝.     

应力负荷下兔肩袖急性断裂重建术后腱-骨修复过程中生物力学特性的研究

目的　探讨应力刺激训练对兔肩袖急性断裂术后修复过程中腱-骨结构生物力学特性的影响。  方法　取新西兰白兔45只（ 2.0～2.5 kg）,术前随机选取5只处死、行生物力学指标检测,作为对照。余白兔随机分为2组：A组（应力负荷组）,B组（与非应力负荷组）,A组术后第二周开始训练,B组正常笼养。分别于术后第2、4、6、8周最后1d训练结束后处死、取材,每组每次处死5只,并行生物力学指标检测。结果数据均采用x±s表示,数据采用SPSS 13.0统计软件处理。  结果　术后2、4、6周,组间比较,最大强度值（P=0.002、P=0.000和P=0.009）与最大载荷值（P=0.001、P=0.000和P=0.000）均存在差异,应力负荷组值较非应力负荷组大。刚度值在术后6、8周,应力负荷组与非应力负荷组之间均存在差异（P=0.000和P＝0.000）,应力负荷组刚度值比非应力负荷组大。  结论　一定的应力刺激可以改善兔肩袖急性断裂术后腱-骨修复过程中的力学性质。     

骨盆前环骨折经皮空心拉力螺钉固定的生物力学研究

目的：通过骨盆生物力学的研究,为前环骨折提供可供选择的临床治疗方式。方法：15具防腐湿性尸体,随机分成三组每组5具。A组骨盆完整,行预试验;B、C两组制成前环骨折模型,B组采用空心拉力螺钉固定,C组采用重建钢板固定。各组均接受不超过500次的循环压力负荷,直至结构衰竭,经动态机械性能分析（DMA）并记录压应力和各方向位移。结果：A组在150N／3Hz模式下出现应力松弛,耻骨支间位移（0．7±0．32）mm;250N／5Hz负荷模式下发生结构衰竭,位移（3．0±0．88）mm。相同的压力／频率耦合模式下,发生松弛时B组位移（1．26±0．49）mm,C组位移（1．06±0．45）mm;发生衰竭时B组的应力为（1010．4±542．46）N,C组为（919．2±409．34）N。结论：拉力螺钉与重建钢板相比,应力足够坚强,基于骨盆的生物力学特点,能够改善前环骨折的治疗。     

桡骨远端钢板联合拉力钉固定治疗Sander III型跟骨骨折的生物力学分析

提出并分析桡骨远端钢板（两点支撑）联合拉力钉固定治疗跟骨骨折的生物力学稳定性。在完整下肢骨骼-肌肉有限元模型的基础上,建立Sanders III型跟骨骨折模型并模拟固定,用桡骨远端钢板（两点支撑）联合拉力钉固定治疗骨折。评估该模型在静态站立和行走状态（足跟着地期、站立中期和推离期）的应力分布和位移情况。跟骨的应力集中于骨折端、跟骨与跟腱连接处,峰值为96.92 MPa。内固定的应力集中于钢板螺钉与载距突和跟骨结节接触位置,峰值为883.20 MPa。后关节面位移、Bohler角和Gissanes角均维持较好。桡骨远端钢板联合拉力钉固定治疗跟骨骨折具有良好的生物力学稳定性,体现微创原则,操作简单,术后可以早期康复训练,值得临床推广应用。     

婴幼儿心室辅助泵——20mL罗叶泵体外测试平台的建立和性能研究

目的 设计并制作基于婴幼儿心室辅助泵——罗叶泵的体外测试平台,分别完成20 mL婴幼儿罗叶泵的流体性能实验和耐疲劳实验。方法 将罗叶泵驱动装置、20 mL婴幼儿罗叶泵、前负荷腔、前负荷压力传感器、后负荷腔、前负荷压力传感器、心电监护器、阻尼器和流量计等按不同的实验目的组装成不同的测试平台,流体温度控制为37 ℃,分别用来完成20 mL婴幼儿罗叶泵的流体性能实验和耐疲劳实验。结果 所制作的流体性能实验平台能较好的模拟人体前后负荷;在固定泵输出压力时,测量了20 mL婴幼儿罗叶泵泵频率与泵前压力（前负荷）、泵后压力（后负荷）和流量的关系;所组装的耐疲劳实验平台能够测试罗叶泵的耐疲劳性能;20 mL婴幼儿罗叶泵在连续搏动70 d后,其形变率仅为4 %。结论 所组装的搏动泵测试平台能测试20 mL婴幼儿罗叶泵的流体性能和耐疲劳性能;所制作的20mL婴幼儿罗叶泵具有较好的稳定性和耐疲劳性。 更多还原     

基于定量动态负荷下膝关节骨性关节炎软骨MRIT2时间表现研究

目的通过比较膝关节骨性关节炎（OA）病人定量动态负荷前后膝关节软骨T2时间变化情况,分析MRIT2mapping序列反映软骨基质生物力学变化的灵敏度．并验证高磁场条件下人体关节负荷装置的有效性。方法10例膝关节OA病人,其中男性3例．女性7例：年龄4l～66岁．平均年龄57-3岁。依托人体下肢关节力学负荷装置,对其施加膝关节动态负荷。负荷前后行膝关节MRIT2maDping成像,将膝关节轴向负荷区软骨分为4个部位：胫骨平台内、外侧软骨区及股骨内、外侧髁软骨区．分别测量各部位软骨负荷前后的T,时间。对负荷前膝关节内、外侧软骨分级评估进行卡方检验,对同一软骨区动态负荷前后的T2时间进行配对t检验。结果负荷前膝关节内外侧软骨分级差异无统计学意义（P〉0．05）。OA病人负荷前后T2值,胫骨平台内侧软骨区分别为（39．59±4．17）ms、（40．14±4．49）ms（f=0．426,P=0．680）;胫骨平台外侧软骨区（38．85±6．72）ms、（41．25±6．54）ms（t=1．704,P=0．123）：股骨内侧髁软骨区（36．44±5．72）ms、（40．63±4．90）ms（t=1．783,P=0．108）;股骨外侧髁软骨区（39．30±5．78）ms、（46．14±5．03）ms（t=2．826,P=0．020）。结论OA病人负荷后膝关节局部区域软骨区T2时间延长．自行设计的动态加压装置适合在高磁场条件下完成加压及MRI检查,有一定推广意义。     

高跟鞋对行走中女性躯干、下肢的力学影响

通过探讨高跟鞋对行走中女性躯干、下肢的生物力学影响,可以为设计更符合人体运动功能的高跟鞋提供理论依据.通过总结本文得出高跟鞋对女性的常见损伤有扁平足、足趾畸形、踝关节扭伤、膝关节炎、腰背酸痛;穿高跟鞋行走的步态特征是步幅小、步速慢、周期长、重心起伏大、单支撑时相缩短;其力学特征有足底受力不均匀、踝关节受力减少、膝关节内压力增大、下肢肌肉肌力变小、脊柱负荷加大等.总之长期穿高跟鞋行走对女性躯干、下肢产生许多不利影响,因此建议女性平时尽量少穿高跟鞋.     

性别与BMI对儿童动态足底压力分布的影响

目的 通过比较肥胖儿童和正常儿童男女平地自然行走时的足底压力分布参数以及考察体重指数（body mass index,BMI）与各参数的相关性,探讨性别和BMI对儿童动态足底压力分布的影响。方法 采用0.5 m footscanUSB平板测试系统（RSscan International公司,比利时）对79名儿童自然行走时的步态进行测试,数据采用SPSS16.0进行统计处理。结果（1） 对于肥胖儿童和正常儿童,男女之间大部分的足底压力参数均没有显著性差异;（2） 正常男女儿童足中部与地面冲量的百分比以及在M5、MF和HL等区域的压强峰值出现时间存在显著性差异;（3） BMI与足支撑分期、足中部与地面冲量百分比、T25压强峰值、HM和HL压强峰值出现时间无显著相关性;(4)BMI与其余足底压力分布参数均有良好相关性。结论（1） 性别对肥胖儿童动态足底压力分布没有显著影响,但正常儿童部分动态足底压力分布参数受性别的影响;（2） BMI大的儿童行走的稳定性差,行走效率低;（3） BMI大的儿童行走易疲劳,易引起踝关节等部位损伤。     

Physiological strain due to load carrying

Summary In an experimental study of load carrying the effects of mass (0, 5.4, 10.4 kg) and the type of support (on the shoulder or on waist) on parameters of physiological strain were quantified to determine the factor(s) which limit carrying time. Four categories of strain were investigated: metabolic (in terms of oxygen uptake), cardiovascular (in terms of heart rate), muscular (in terms of EMG activity) and skin pressure under the shoulder straps. Four young male subjects were tested on a treadmill using different combinations of load and speed. While standing, oxygen uptake was not influenced by the type or mass of the backpack, and averaged 10% maximal oxygen uptake. The heart rate increased significantly by 9 beats per min while standing wearing a backpack, independent of type of support or mass of backpack. While walking both the heart rate and the oxygen uptake were significantly influenced by the mass carried, but both types of strain remained below the tolerance limits for prolonged wear. Standing supporting a load did not significantly increase the root mean square value of the EMG signal of the trapezius pars descendens muscle. While walking, load carrying significantly increased the root mean square value, and, converted to force, the largest increase amounted to 2.7% of the maximal force for a load of 10.4 kg suspended from the shoulders. This was below levels of force producing fatigue, which was also indicated by an absence of changes in the median power frequency of the EMG signal. The pressure on the skin under the shoulder straps during load carrying on the shoulders was more than a factor of three times higher than the threshold value for skin and tissue irritation. Load transfer to the waist with a flexible frame reduced the pressures on the skin of the shoulder to far below the threshold value. On basis of these results it was concluded that even with relatively low loads the limiting factor was the pressure on the skin, if a waist belt did not relieve such pressure on the shoulders.     

Early independent walking: A longitudinal study of load perturbation effects

This study investigated infants' ability to adapt to experimentally induced changes in their body dimensions at walk onset, and how this ability is affected by increased walking experience. Fifteen infants were studied over their first 6 months of independent walking with a load perturbation design. They traversed a walkway with loads symmetrically placed around the shoulders, waist, or ankles, and without loading. At walk onset, infants fell more with shoulder and ankle loads than with waist or no loads. Shoulder loads further resulted in higher walking speed and longer steps, while waist loads resulted in increased walking speed and larger foot rotation. Ankle loads disrupted walking proficiency the most, as indicated by lower walking speed, shorter steps, larger foot rotation, and smaller step‐to‐step angle. Step width was not differentially affected by the conditions. With increased experience, walking proficiency increased across all conditions, but ankle loads lagged behind the other conditions. Loading effects are discussed with respect to walking experience and position of the loads on the body. © 2009 Wiley Periodicals, Inc. Dev Psychobiol 51: 374–383, 2009.     

五金塑胶业作业工人肌肉骨骼疾患调查

目的通过横断面流行病学调查了解五金塑胶业作业工人肌肉骨骼疾患现况,探讨其主要危险因素。方法选取某五金塑胶厂1032人为调查对象,采用经修改的北欧国家标准调查表进行肌肉骨骼疾患横断面流行病学调查。结果五金塑胶业作业工人肌肉骨骼疾患以腰部、颈部和踝足部疾患为主,年患病率分别为26.2%、17.9%和16.3%。女工肩和膝部疼痛年患病率显著高于男工（P〈0.05）。不同工种腰痛年患病率由高到低依次为工模技工（37.3%）、包装工（36.1%）、操作工（27.3%）、车床工（25.0%）、碰焊工（20.0%）和冲压工（19.6%）。腰部职业性肌肉骨骼疾患（OMSD）年患病率随工龄增长有增加趋势（P〈0.05）。长时间保持经常稍微转身姿势、经常稍微弯腰、经常大幅度弯腰、以不舒服的姿势工作、搬举重物远离身体、搬举重物需要转身、以不舒服的体位搬举重物、经常替同事换班均可增加腰痛的年患病率;选择性Logistic回归分析表明,搬举重物需要转身、长时间保持稍微弯腰姿势、经常替同事换班、休息是否充足被选入模型。结论五金塑胶业作业工人肌肉骨骼疾患以腰痛为主,不良劳动姿势、手工搬举重物以及二者同时存在是导致腰痛的首要危险因素,应积极采取工效学手段进行干预。     

Obesity and Obesity Shape Markedly Influence Spine Biomechanics: A Subject-Specific Risk Assessment Model

Underlying mechanisms of obesity-related back pain remain unexplored. Thus, we aim to determine the effect of obesity and its shapes on the spinal loads and the associated risks of injury. Obesity shapes were initially constructed by principal component analysis based on datasets on 5852 obese individuals. Spinal loads, cycles to vertebral failure and trunk stability margin were estimated in a subject-specific trunk model taking account of personalized musculature, passive ligamentous spine, obesity shapes, segmental weights, spine kinematics and bone mineral density. Three obesity shapes (mean and extreme abdominal circumferences) at three body weights (BWs) of 86, 98 and 109 kg were analyzed. Additional BW (12 kg) increased spinal loads by ~11.8%. Higher waist circumferences at identical BW increased spinal forces to the tune of ~20 kg additional BW and the risk of vertebral fatigue compression fracture by 3–7 times when compared with smaller waist circumferences. Forward flexion, greater BW and load in hands increased the trunk stability margin. Spinal loads markedly increased with BW, especially at greater waist circumferences. The risk of vertebral fatigue fracture also substantially increased at greater waist circumferences though not at smaller ones. Obesity and its shape should be considered in spine biomechanics.     

锁定接骨板治疗肱骨近端骨折26例

目的探讨肱骨近端锁定接骨板治疗肱骨近端骨折的临床疗效。方法 2006年1月～2010年3月使用肱骨近端锁定接骨板治疗肱骨近端骨折26例,其中男11例,女15例,年龄51～75岁（平均60.2岁）,按Neer分类法：二部分骨折16例,三部分骨折10例。手术采用三角肌、胸大肌间隙入路,不剥离附着于骨折碎片及大、小结节上的组织即行骨折复位固定,其中9例行人工颗粒骨充填。术后第3天肩关节适量被动活动,1周后适量主动及被动活动,2周后加强主动及被动活动功能锻炼。结果 22/26例（84.6%）获随访,随访时间3～16个月,平均10.2个月,骨折均愈合,平均愈合时间11.5周（10～16周）,按照Neer评分标准,功能优11例,良7例,中4例,优良率为81.8%。结论对于肱骨近端骨折的老年患者,肱骨近端锁定接骨板可起到牢固固定肱骨近端骨折的作用,骨折愈合与功能锻炼同步,提高了治疗效果,特别适用于肱骨近端骨质疏松性、粉碎性骨折。     

Back and neck extensor loading and back pain provocation in urban bus drivers with and without low back pain

This study assessed low back and trapezius muscle activity in bus drivers, with or without recurrent low back pain (LBP), during the long term driving. In addition, low back and neck–shoulder pain intensities and fatigue were measured and the effect of low back support was observed. Also the possible source of LBP was attempted to assess by vibration pain provocation test and lumbar MRI.

Forty bus drivers (recurrent LBP n = 25) participated in this study. Low back and neck–shoulder pain and subjective fatigue intensity was assessed by visual analogue scales (VAS) before and after driving. Lumbar paraspinal and trapezius muscle activation during driving was measured by surface EMG. Vibration pain provocation test was applied for all subjects.

Average paraspinal myoelectric activity during driving was approximately 1% of MVC in both groups. Average trapezius myoelectric activity during driving was from 2 to 4% of MVC. Trapezius muscle activity was higher in back healthy drivers than in those with LBP. The low back support had no effect either on paraspinal or trapezius EMG activity. Low back and neck–shoulder fatigue increased during driving in both groups especially in those subjects with positive vibration pain provocation. The neck–shoulder pain and fatigue were more severe in drivers suffering from LBP. Low back support had no effect on low back and neck–shoulder subjective fatigue and neck–shoulder pain but tended to limit the LBP increase during driving. Paraspinal muscle loading in urban bus drivers was very limited and either LBP or ergonomic low back support had no effect on it. Trapezius muscle seemed to be less active in drivers suffering from recurrent LBP. Internal disc disruptions may expose to pain and fatigability during driving.     

Work load during floor cleaning. The effect of cleaning methods and work technique

Cardiovascular and muscle load levels were evaluated during floor cleaning. A group of 12 experienced female cleaners participated in the study. Of the subjects 6 used a mopping method and 6 a traditional scrub and cloth method. Heart rate, oxygen consumption, rating of perceived exertion, electromyography from the trapezius muscle and video recordings were obtained during floor cleaning. With respect to relative heart rate and oxygen consumption the two groups did not differ. The results revealed a high cardiovascular load corresponding on average to 53% of the individual maximal oxygen uptake. In addition 65% of the observed period was spent with the back in a position forward flexed more than 20°. The time spent in extreme forward back flexion was shorter for the mopping group. Both groups exhibited high static, median and peak shoulder muscle load levels of 10%, 25% and 54% maximal voluntary contraction, respectively. At the same time, however, the mopping group tended to have a higher shoulder load than the group using the scrub and cloth method. Furthermore, electromyographic signs of fatigue in the trapezius muscle indicated a more stereotype activation of the shoulder muscles during mopping than during scrubbing. Based on these results, it was concluded that mopping cannot be recommended as less strenuous than scrubbing.     

健走活动对职业人群健康的影响

目的 研究健走活动对职业人群健康的影响。方法 选取天津市滨海示范区机关事业单位参加首届“万步有约”健走干预项目的职工作为研究对象,收集性别、年龄、体重、腰围、身高、体脂肪率、内脏指数和血压等资料,比较健走前后各项指标的差异。结果 共纳入120人,其中男性70人,占58.33%;女性50人,占41.67%;年龄23~58岁,平均年龄（37.27±5.12）岁。健走后职工平均体重、腰围、BMI、体脂率、内脏指数和血压值均较健走前降低（P＜0.05）。健走后男女职工的腰围、BMI、内脏指数和血压与健走前相比,都有不同程度的下降 （P＜0.05）;男女职工腰围、BMI和血压存在时间交互作用（P＜0.05）,且男职工健走后的下降幅度大于女职工（均P＜0.05）;男女职工内脏指数随时间变化的差异均无统计学意义（P＞0.05）。不同年龄段职工的腰围、内脏指数、收缩压和舒张压存在时间交互作用（P＜0.05）,而BMI不存在时间交互作用（P＞0.05）。结论 健步活动可改善职业人群腰围、血压等指标,且发现男性、中老年职工的体质指标改善效果更明显。     

精神分裂症共病代谢综合征患者血清同型半胱氨酸的对照研究

目的对精神分裂症共病代谢综合征(MS)患者血清同型半胱氨酸(Hcy)水平进行对照研究。方法 33例首次确诊为MS的精神分裂症患者作为观察组,33例不伴有MS的精神分裂症患者作为对照组,分别测定其空腹血清Hcy水平;同时测定腰围、体质量指数(BMI)、空腹血糖(FBG)、血脂[总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)]、血压[收缩压(SBP)/舒张压(DBP)]等MS相关指标。结果①观察组血清Hcy水平显著高于对照组,两组比较差异有统计学意义(t=-2.775,P0.01);②观察组高Hcy血症的发生率显著高于对照组,两组比较差异有统计学意义(χ2=6.061,P0.05);③观察组的血清Hcy水平与HDL-C、LDL-C具有相关性(r=-0.346,0.373;P0.05),而与腰围、BMI、FBG、TC、TG、SBP、DBP均无显著的相关;对照组的血清Hcy水平与腰围、BMI、FBG、TC、TG、HDL-C、LDL-C、SBP、DBP均无显著的相关性。结论与不伴发MS的精神分裂症患者相比,伴发MS的精神分裂症患者血清Hcy水平显著增高;伴发MS的精神分裂症患者的血清Hcy水平与HDL-C、LDL-C有关。     

Repetitive arm motion-induced fatigue affects shoulder but not endpoint position sense

Neck/shoulder pain has previously been linked to repetitive work and muscle fatigue. We have shown that asymptomatic people performing repetitive upper limb tasks display signs of shoulder fatigue and of whole-body compensatory strategies. However, the role played by the proprioceptive system in the production of these compensatory strategies has not been studied. A group of asymptomatic adults (n = 18) performed a repetitive pointing task at shoulder height to fatigue. Before and after fatigue, they performed two position sense tasks, eyes closed: a single-joint task where they abducted their shoulder to the perceived horizontal and a multi-joint task, where they stood and placed their finger at the perceived location of a target in front of them at shoulder height. After fatigue, subjects made larger shoulder errors by raising their elbow higher above the horizontal (~+1.3 cm) than before fatigue; however, their finger position accuracy was not changed, despite all subjects performing the movement in less time (~−0.18 s) while fatigued. There were no gender differences in shoulder or finger position accuracy before or after fatigue; however, there were gender differences in the perceived finger-target location and in the temporal characteristics of the finger movement toward the target. Results suggest that healthy individuals are able to develop strategies to compensate for fatigue-induced deficits at one joint to maintain the endpoint accuracy of a multi-joint task constant. Gender differences in movement strategies and perception of endpoint location may play parts in the previously reported gender differences in work-related neck/shoulder symptoms.