Objective: To study the regulation of blood pulse volume via photoplethysmography (PPG) signal detected from toe, while the lower limb is passively raised in different height positions. Methods: Use a modified non-inv...Objective: To study the regulation of blood pulse volume via photoplethysmography (PPG) signal detected from toe, while the lower limb is passively raised in different height positions. Methods: Use a modified non-invasive PPG technique to detect the blood pulse signal on toe with infrared (IR) photo sensor. A protocol consisting of two postures, i.e., supine and 45° reclining, was designed to conduct laboratory trial in this study. During the period of performing the protocol of these postures, the lower limb was passively raised from the heights of 10 cm to 60 cm randomly and individually with sponge blocks underneath the foot. Results: In the supine posture, the higher the foot was passively raised, the more the blood PPG signal decreased. In the 45° reclining posture, the blood PPG signal increased at the beginning and then decreased in the foot height position from 10 cm to 60 cm. In both postures the normalized AC signal changes significantly while the normalized DC signal changes little. Conclusion: The toe PPG signals can obviously indicate the regulated blood volume change with the designated postural procedures due to the heart level position.展开更多
Modern human has different body proportion from early hominids and great apes.Comparing with others,in general,modern human adults have relatively long lower limb and heavier body weight.Since the lower limbs provide ...Modern human has different body proportion from early hominids and great apes.Comparing with others,in general,modern human adults have relatively long lower limb and heavier body weight.Since the lower limbs provide support to the whole body and play an important role in walking,it is proposed that the ratio of the lower limb to the whole body for modern human could be beneficial to bipedal walking.This study tried to estimate the muscle parameters of the lower limb in walking for the subjects with various body proportions.Using a simplified musculoskeletal model,some muscle parameters of the lower limb,e.g.muscle force,stress,work and power,were estimated for modern human adult,child,AL 288-1(the fossil specimens of Australopithecus afarensis,3.18 million years old)and apes.The results show that with the body proportion modern human adult spends less muscle work and power in walking than other subjects.The results imply that using the cost of transport(i.e.the muscle work of the lower limb per unit of displacement)as the criteria,the early hominids,if their body proportions were structurally similar to AL 288-1,could evolve towards what modern human adult looks like,in order to save energy during bipedal walking.展开更多
目的基于体表大数据构建我国中青年下肢冠状面力线不良预测模型,为临床工作提供更加快速、准确的下肢冠状面力不良预测方法。方法采用横断面研究设计方案,筛选陆军军医大学第一附属医院运动医学中心2022年5月至2023年12月收治的915例膝...目的基于体表大数据构建我国中青年下肢冠状面力线不良预测模型,为临床工作提供更加快速、准确的下肢冠状面力不良预测方法。方法采用横断面研究设计方案,筛选陆军军医大学第一附属医院运动医学中心2022年5月至2023年12月收治的915例膝关节半月板撕裂患者的病历资料,测量其下肢冠状面力线(简称下肢力线)。按照下肢力线分级标准将915例患者分中立位下肢力线及下肢力线不良两组,按照7∶3随机分为训练集和验证集。分析训练集性别、年龄及体表大数据(包括BMI、下肢长、双膝距、双踝距、皮下脂肪厚度)的7项指标用于预测下肢力线不良的价值,建立Logistic回归模型并使用列线图对模型进行可视化,使用校准曲线、ROC曲线和DCA曲线评估模型对下肢力线不良的诊断效能。结果训练集640例,其中男性299例,女性341例,中位年龄41.5岁;验证集275例,其中男性128例,女性147例,中位年龄41.0岁。训练集中中立位下肢力线和下肢力线不良两组间的性别、年龄、BMI等7项指标之间的差异均有统计学意义(P<0.01)。多因素Logistic回归构建了含BMI[(24.31±3.58)kg/m^(2);OR=1.12,95%CI:1.06~1.19,P<0.001]、下肢长[82.00(78.00~87.00)cm;OR=0.95,95%CI:0.92~0.98,P=0.002]、双膝距[30.00(16.00~45.25)mm;OR=1.06,95%CI:1.05~1.07,P<0.001]、双踝距[23.00(18.00~30.00)mm;OR=0.98,95%CI:0.96~1.00,P=0.078]、性别[男性299(46.72%);OR=0.70,95%CI:0.46~1.06,P=0.089]的预测模型,模型预测下肢力线不良的受试者操作曲线下面积(area under the subject curve,AUC)在训练集和验证集中分别为0.808、0.770。结论基于体表大数据,初步构建我国中青年下肢力线不良预测模型,其对于下肢力线不良的诊断效能较高。展开更多
Body weight-supported treadmill training with the voluntary driven exoskeleton(VDE-BWSTT) has been shown to improve the gait function of patients with chronic spinal cord injury. However, little is known whether VDE-B...Body weight-supported treadmill training with the voluntary driven exoskeleton(VDE-BWSTT) has been shown to improve the gait function of patients with chronic spinal cord injury. However, little is known whether VDE-BWSTT can effectively improve the trunk function of patients with chronic spinal cord injury. In this open-label, single-arm study, nine patients with chronic spinal cord injury at the cervical or thoracic level(six males and three females, aged 37.8 ± 15.6 years, and time since injury 51.1 ± 31.8 months) who underwent outpatient VDE-BWSTT training program at Keio University Hospital, Japan from September 2017 to March 2019 were included. All patients underwent twenty 60-minute gait training sessions using VDE. Trunk muscular strength, i.e., the maximum force against which patient could maintain a sitting posture without any support, was evaluated in four directions: anterior, posterior, and lateral(right and left) after 10 and 20 training sessions. After intervention, lateral muscular strength significantly improved. In addition, a significant positive correlation was detected between the change in lateral trunk muscular strength after 20 training sessions relative to baseline and gait speed. The change in trunk muscular strength after 20 training sessions relative to baseline was greatly correlated with patient age. This suggests that older adult patients with chronic spinal cord injury achieved a greater improvement in trunk muscle strength following VDE-BWSTT. All these findings suggest that VDE-BWSTT can improve the trunk function of patients with chronic spinal cord injury and the effect might be greater in older adult patients. The study was approved by the Keio University of Medicine Ethics Committee(IRB No. 20150355-3) on September 26, 2017.展开更多
目的:比较不同频率全身振动训练对脑卒中患者下肢功能的影响。方法:将60例脑卒中患者随机分为10Hz组(n=20)、20Hz组(n=20)和30Hz组(n=20)。3组均接受常规康复训练,10Hz组在常规训练上给予10Hz全身振动训练,20Hz组在常规训练上给予20Hz...目的:比较不同频率全身振动训练对脑卒中患者下肢功能的影响。方法:将60例脑卒中患者随机分为10Hz组(n=20)、20Hz组(n=20)和30Hz组(n=20)。3组均接受常规康复训练,10Hz组在常规训练上给予10Hz全身振动训练,20Hz组在常规训练上给予20Hz全身振动训练,30Hz组在常规训练上给予30Hz全身振动训练。治疗前和治疗4周后,采用Fugl-Meyer下肢运动功能量表(Fugl-Meyer assessment scale-lower extremity,FMA-LE)、Berg平衡量表(Berg balance scale,BBS)、计时起立-行走测试(time up and go test,TUGT)、10m最大步行速度(10m maximum walking speed,MWS)进行评定。结果:治疗4周后,3组患者的FMA-LE、BBS、TUGT和10mMWS均较治疗前显著改善(P<0.05),30Hz组和20Hz组均显著优于10Hz组(P<0.05),30Hz组各项指标改善最显著(P<0.05)。结论:3组不同频率全身振动训练均可改善脑卒中患者的下肢功能、平衡和步行能力,但30Hz全身振动训练效果最佳。展开更多
To help walking,using assistive devices can be considered to reduce the loads caused by weight and to effectively decrease the propulsive forces.In this study,a mobility Saddle-Assistive Device(S-AD)supporting body we...To help walking,using assistive devices can be considered to reduce the loads caused by weight and to effectively decrease the propulsive forces.In this study,a mobility Saddle-Assistive Device(S-AD)supporting body weight while walking was evaluated on two healthy volunteers.This device is based on the support of body weight against gravity with the help of a saddle,which is not used in other passive mobility assistive devices.To prove the efficiency of this device,the experimental results obtained while walking with this device were compared with those related to walking without the assistive device.The results showed that this device could significantly reduce the forces and torque of the lower and upper limbs when walking.By distributing the load on the saddle,the vertical force and the propulsive force in the best conditions were decreased to 46.7%and were increased to 13.7%in body weight,respectively.Using a S-AD can help patients with lower limbs weakness and elderly people to walk.展开更多
文摘Objective: To study the regulation of blood pulse volume via photoplethysmography (PPG) signal detected from toe, while the lower limb is passively raised in different height positions. Methods: Use a modified non-invasive PPG technique to detect the blood pulse signal on toe with infrared (IR) photo sensor. A protocol consisting of two postures, i.e., supine and 45° reclining, was designed to conduct laboratory trial in this study. During the period of performing the protocol of these postures, the lower limb was passively raised from the heights of 10 cm to 60 cm randomly and individually with sponge blocks underneath the foot. Results: In the supine posture, the higher the foot was passively raised, the more the blood PPG signal decreased. In the 45° reclining posture, the blood PPG signal increased at the beginning and then decreased in the foot height position from 10 cm to 60 cm. In both postures the normalized AC signal changes significantly while the normalized DC signal changes little. Conclusion: The toe PPG signals can obviously indicate the regulated blood volume change with the designated postural procedures due to the heart level position.
基金Supported in part by the grants fromthe BiotechnologyBiological Sciences Research Council,the Leverhulme Trustthe Natural Environment Research Council,U.K.
文摘Modern human has different body proportion from early hominids and great apes.Comparing with others,in general,modern human adults have relatively long lower limb and heavier body weight.Since the lower limbs provide support to the whole body and play an important role in walking,it is proposed that the ratio of the lower limb to the whole body for modern human could be beneficial to bipedal walking.This study tried to estimate the muscle parameters of the lower limb in walking for the subjects with various body proportions.Using a simplified musculoskeletal model,some muscle parameters of the lower limb,e.g.muscle force,stress,work and power,were estimated for modern human adult,child,AL 288-1(the fossil specimens of Australopithecus afarensis,3.18 million years old)and apes.The results show that with the body proportion modern human adult spends less muscle work and power in walking than other subjects.The results imply that using the cost of transport(i.e.the muscle work of the lower limb per unit of displacement)as the criteria,the early hominids,if their body proportions were structurally similar to AL 288-1,could evolve towards what modern human adult looks like,in order to save energy during bipedal walking.
文摘目的基于体表大数据构建我国中青年下肢冠状面力线不良预测模型,为临床工作提供更加快速、准确的下肢冠状面力不良预测方法。方法采用横断面研究设计方案,筛选陆军军医大学第一附属医院运动医学中心2022年5月至2023年12月收治的915例膝关节半月板撕裂患者的病历资料,测量其下肢冠状面力线(简称下肢力线)。按照下肢力线分级标准将915例患者分中立位下肢力线及下肢力线不良两组,按照7∶3随机分为训练集和验证集。分析训练集性别、年龄及体表大数据(包括BMI、下肢长、双膝距、双踝距、皮下脂肪厚度)的7项指标用于预测下肢力线不良的价值,建立Logistic回归模型并使用列线图对模型进行可视化,使用校准曲线、ROC曲线和DCA曲线评估模型对下肢力线不良的诊断效能。结果训练集640例,其中男性299例,女性341例,中位年龄41.5岁;验证集275例,其中男性128例,女性147例,中位年龄41.0岁。训练集中中立位下肢力线和下肢力线不良两组间的性别、年龄、BMI等7项指标之间的差异均有统计学意义(P<0.01)。多因素Logistic回归构建了含BMI[(24.31±3.58)kg/m^(2);OR=1.12,95%CI:1.06~1.19,P<0.001]、下肢长[82.00(78.00~87.00)cm;OR=0.95,95%CI:0.92~0.98,P=0.002]、双膝距[30.00(16.00~45.25)mm;OR=1.06,95%CI:1.05~1.07,P<0.001]、双踝距[23.00(18.00~30.00)mm;OR=0.98,95%CI:0.96~1.00,P=0.078]、性别[男性299(46.72%);OR=0.70,95%CI:0.46~1.06,P=0.089]的预测模型,模型预测下肢力线不良的受试者操作曲线下面积(area under the subject curve,AUC)在训练集和验证集中分别为0.808、0.770。结论基于体表大数据,初步构建我国中青年下肢力线不良预测模型,其对于下肢力线不良的诊断效能较高。
基金supported by the Uehara Memorial foundation,Japan Science and Technology Agency,No.05-001-0002Japan Agency for Medical Research and Development,No.19bk0104017h00029(both to MN)。
文摘Body weight-supported treadmill training with the voluntary driven exoskeleton(VDE-BWSTT) has been shown to improve the gait function of patients with chronic spinal cord injury. However, little is known whether VDE-BWSTT can effectively improve the trunk function of patients with chronic spinal cord injury. In this open-label, single-arm study, nine patients with chronic spinal cord injury at the cervical or thoracic level(six males and three females, aged 37.8 ± 15.6 years, and time since injury 51.1 ± 31.8 months) who underwent outpatient VDE-BWSTT training program at Keio University Hospital, Japan from September 2017 to March 2019 were included. All patients underwent twenty 60-minute gait training sessions using VDE. Trunk muscular strength, i.e., the maximum force against which patient could maintain a sitting posture without any support, was evaluated in four directions: anterior, posterior, and lateral(right and left) after 10 and 20 training sessions. After intervention, lateral muscular strength significantly improved. In addition, a significant positive correlation was detected between the change in lateral trunk muscular strength after 20 training sessions relative to baseline and gait speed. The change in trunk muscular strength after 20 training sessions relative to baseline was greatly correlated with patient age. This suggests that older adult patients with chronic spinal cord injury achieved a greater improvement in trunk muscle strength following VDE-BWSTT. All these findings suggest that VDE-BWSTT can improve the trunk function of patients with chronic spinal cord injury and the effect might be greater in older adult patients. The study was approved by the Keio University of Medicine Ethics Committee(IRB No. 20150355-3) on September 26, 2017.
文摘目的:比较不同频率全身振动训练对脑卒中患者下肢功能的影响。方法:将60例脑卒中患者随机分为10Hz组(n=20)、20Hz组(n=20)和30Hz组(n=20)。3组均接受常规康复训练,10Hz组在常规训练上给予10Hz全身振动训练,20Hz组在常规训练上给予20Hz全身振动训练,30Hz组在常规训练上给予30Hz全身振动训练。治疗前和治疗4周后,采用Fugl-Meyer下肢运动功能量表(Fugl-Meyer assessment scale-lower extremity,FMA-LE)、Berg平衡量表(Berg balance scale,BBS)、计时起立-行走测试(time up and go test,TUGT)、10m最大步行速度(10m maximum walking speed,MWS)进行评定。结果:治疗4周后,3组患者的FMA-LE、BBS、TUGT和10mMWS均较治疗前显著改善(P<0.05),30Hz组和20Hz组均显著优于10Hz组(P<0.05),30Hz组各项指标改善最显著(P<0.05)。结论:3组不同频率全身振动训练均可改善脑卒中患者的下肢功能、平衡和步行能力,但30Hz全身振动训练效果最佳。
文摘To help walking,using assistive devices can be considered to reduce the loads caused by weight and to effectively decrease the propulsive forces.In this study,a mobility Saddle-Assistive Device(S-AD)supporting body weight while walking was evaluated on two healthy volunteers.This device is based on the support of body weight against gravity with the help of a saddle,which is not used in other passive mobility assistive devices.To prove the efficiency of this device,the experimental results obtained while walking with this device were compared with those related to walking without the assistive device.The results showed that this device could significantly reduce the forces and torque of the lower and upper limbs when walking.By distributing the load on the saddle,the vertical force and the propulsive force in the best conditions were decreased to 46.7%and were increased to 13.7%in body weight,respectively.Using a S-AD can help patients with lower limbs weakness and elderly people to walk.
