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bend rigidity coefficient
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AIM To explore the effects of intermittent +45°head up tilt (IHUT) on hindlimb unweightling rats. METHODS Twenty male SD rats were randomly divided into control group (C,7), tail suspension group (S,6) and IHUT group (H,7). On the basis of tail suspension to simulate weightlessness, H rats were given 6 h IHUT per day. The effects of 4 wk IHUT on tail suspension rats were evaluated by measuring physical and mechanical parameters of femur. RESULTS femoral mass (fresh, dry and ash), diameter, and density...

AIM To explore the effects of intermittent +45°head up tilt (IHUT) on hindlimb unweightling rats. METHODS Twenty male SD rats were randomly divided into control group (C,7), tail suspension group (S,6) and IHUT group (H,7). On the basis of tail suspension to simulate weightlessness, H rats were given 6 h IHUT per day. The effects of 4 wk IHUT on tail suspension rats were evaluated by measuring physical and mechanical parameters of femur. RESULTS femoral mass (fresh, dry and ash), diameter, and density (fresh) of S, H rats were declined significantly to compared with thase of C rats ( P <0.01 or P <0.05). The diameter ( P <0.05) and the density ( P <0.01) of H rat′s femora obviously improved to compare with these of S rats, and all qualities tended to increase. The strength and stiffness of femora were much more weakened ( P <0.01) in S rats then these in C rats. The maximum load (ML) and bending rigidity coefficient (BRC) depressed ( P < 0.05), while the bending toughness coefficient (BTC) increased ( P <0.01) in H group. Elastic load (EL) of H rats improved more markedly ( P <0.05) than that of S group. ML, BRC and EL/ elastic deformation (ED) also tended to improve. CONCLUSION By using IHUT, the growth and mechanical parameters of weight loading bones of hindlimb unweightling rats can partly be improved.

目的 研究间断性 45°头高位对抗措施 (intermittent+4 5°head- up- tilt,IHU T)对尾吊大鼠承重骨的影响 .方法 SD雄性大鼠 2 0只 ,按体质量配对后随机分为 :对照组 (C,7只 ) ,悬吊组 (S,6只 ) ,头高位组 (H,7只 ) .在尾吊大鼠模型模拟失重的基础上 ,H组大鼠每日给予 6 h IHUT.利用物理测量和三点弯曲等实验 ,观察了 4wk IHUT对尾吊大鼠股骨生长、生物力学特性的影响 .结果  S,H组大鼠股骨质量、灰分、直径和密度均较 C组大鼠显著下降 (P<0 .0 1或 P<0 .0 5 ) ;与 S组比较 ,H组大鼠的直径 (P<0 .0 5 )和密度 (P<0 .0 1)显著改善 ,质量和灰分有增加趋势 .与 C组相比 ,S组大鼠股骨的强度和刚度显著降低 (P<0 .0 1) ;H组最大载荷和刚性系数显著降低 (P<0 .0 5 ) ,韧性系数显著升高 (P<0 .0 1) .与 S组大鼠相比 ,H组大鼠弹性载荷显著提高 (P<0 .0 5 ) ,最大载荷、刚性系数和挠度载荷比值有提高趋势 .结论  IHUT对尾吊大鼠的承重骨的生长及力学特...

目的 研究间断性 45°头高位对抗措施 (intermittent+4 5°head- up- tilt,IHU T)对尾吊大鼠承重骨的影响 .方法 SD雄性大鼠 2 0只 ,按体质量配对后随机分为 :对照组 (C,7只 ) ,悬吊组 (S,6只 ) ,头高位组 (H,7只 ) .在尾吊大鼠模型模拟失重的基础上 ,H组大鼠每日给予 6 h IHUT.利用物理测量和三点弯曲等实验 ,观察了 4wk IHUT对尾吊大鼠股骨生长、生物力学特性的影响 .结果  S,H组大鼠股骨质量、灰分、直径和密度均较 C组大鼠显著下降 (P<0 .0 1或 P<0 .0 5 ) ;与 S组比较 ,H组大鼠的直径 (P<0 .0 5 )和密度 (P<0 .0 1)显著改善 ,质量和灰分有增加趋势 .与 C组相比 ,S组大鼠股骨的强度和刚度显著降低 (P<0 .0 1) ;H组最大载荷和刚性系数显著降低 (P<0 .0 5 ) ,韧性系数显著升高 (P<0 .0 1) .与 S组大鼠相比 ,H组大鼠弹性载荷显著提高 (P<0 .0 5 ) ,最大载荷、刚性系数和挠度载荷比值有提高趋势 .结论  IHUT对尾吊大鼠的承重骨的生长及力学特性有一定改善作用

Objective To explore the effects of intermittent standing on femur of tail suspension rats. Methods Thirty five male SD rats were randomly divided into 5 groups (n=7): control group (C), tail suspension group (S) and 3 standing groups (including: L1, L2 and L4 groups). Tail suspension was used to simulate weightlessness in group S and 3 L groups. The rats of later 3 groups underwent standing instead of tail suspension for 1 h, 2 h or 4 h each day. Physical and mechanical parameters of femur of rats were...

Objective To explore the effects of intermittent standing on femur of tail suspension rats. Methods Thirty five male SD rats were randomly divided into 5 groups (n=7): control group (C), tail suspension group (S) and 3 standing groups (including: L1, L2 and L4 groups). Tail suspension was used to simulate weightlessness in group S and 3 L groups. The rats of later 3 groups underwent standing instead of tail suspension for 1 h, 2 h or 4 h each day. Physical and mechanical parameters of femur of rats were measured after 3 weeks of experiment. Results As compared with group C, the physical and mechanical properties of femur in 4 experimental groups were significantly lowered (P<0.01). As compared with group S, in group L1, L2, L4 diameter and density of femur were significantly increased (P<0.01), elastic load (EL) and maximum load (ML) improved markedly (P<0.05, P<0.01), and bending rigidity coefficient (BRC) declined significantly. Conclusion The negative effect of simulated weightlessness on physical and mechanical properties of femur in rats can be alleviated significantly by intermittent standing. No apparently better result was found by elongation of time of intermittent standing.

目的 研究不同时段间断性水平站立对尾吊大鼠股骨的影响。 方法  SD雄性大鼠35只 ,按体重配对后随机分为 5组 :对照组 ( C)、悬吊组 ( S)及站立对抗组 (包括 L1、L2和 L4组 ) ,每组各 7只。在尾吊大鼠模拟失重的基础上 ,对抗组大鼠每日分别给予 1h、2 h和 4h水平站立作用。利用物理测量和三点弯曲等实验 ,观察了 3周间断性站立措施对尾吊大鼠股骨生长、生物力学特性的影响。 结果 和 S组相比 ,各对抗组在直径和密度改善方面有显著性意义 ( P<0 .0 1) ;在股骨重量(鲜、干 )和灰分方面增加趋势明显 ,部分指标改善有显著性意义。各对抗组弹性载荷和最大载荷提高有显著性意义 ( P<0 .0 5或 P<0 .0 1) ;韧性系数降低有显著性意义 ( P<0 .0 1) ;刚性系数增加趋势明显。各对抗组之间所有指标差异无显著性意义。 结论 间断性水平位站立显著改善了尾吊大鼠承重骨的生物力学特性及生长代谢 ;延长作用时间 ,对抗效果无显著提高。

Objective To investigate effects of 3 wk simulated weightlessness on morphology, mechanical parameters and growth of hindlimbs in tail suspension rats. Methods Fourteen male SD rats were matched in weight and divided into control group(C) and suspension group(S), in which tail suspension was used to simulate weightlessness. After 3 wk tail suspension, the rats were killed. Physical parameters, mechanical parameters and calcium concentration of femur were measured, and histological changes (using trichrome...

Objective To investigate effects of 3 wk simulated weightlessness on morphology, mechanical parameters and growth of hindlimbs in tail suspension rats. Methods Fourteen male SD rats were matched in weight and divided into control group(C) and suspension group(S), in which tail suspension was used to simulate weightlessness. After 3 wk tail suspension, the rats were killed. Physical parameters, mechanical parameters and calcium concentration of femur were measured, and histological changes (using trichrome stain) of tibia sections were observed. Results During 3 wk tail suspension, the rats grew well, no apparent stimulating reaction was observed. As compared with control group, wet weight, dried weight, ash, diameter and density of femur in suspension group were significantly lower( P <0.01), elastic load, maximum load, and bending rigidity coefficient significantly decreased( P <0.01), while maximum deformation and bending toughness coefficient markedly increased( P< 0.01 or P <0.05). Calcium content in head of femur declined markedly( P <0.05), and in diaphysis showed tendency of decline. Trichrome stain tibia sections showed that mineralization of harversion lamella system was inhibited, and demineralization of former mineralized matrix was prominant. Conclusions After 3 wk tail suspension, the growth of rat's hindlimb bones was suppressed, their bio mechanical properties were declined, and calcium deposition was inhibited.

目的 观察 3周模拟失重对大鼠后肢骨形态、生物力学特性和生长情况的影响。 方法  14只雄性 SD大鼠按体重配对后随机等分为对照组和模拟失重组 ,采用尾部悬吊方法模拟失重 ,3周实验结束后处死大鼠 ,取后肢骨检测股骨物理性状、生物力学特性、钙含量以及胫骨组织学变化 (三色染色法 )。 结果  3周悬吊期间大鼠生长良好 ,未出现明显应激反应 ;与对照组相比 ,3周模拟失重组大鼠股骨湿重、干重、灰分、直径和密度均降低 (P<0 .0 1) ;弹性载荷、最大载荷、刚性系数等均下降(P<0 .0 1) ,最大挠度和韧性系数增大 (P<0 .0 1或 P<0 .0 5 ) ;钙在股骨头部位百分含量降低 (P<0 .0 5 ) ,在股骨干有下降的趋势。切片三色染色结果显示胫骨哈佛氏系统周围骨样组织钙化障碍 ,原有钙化基质内钙盐脱钙现象明显。 结论  3周模拟失重使大鼠后肢骨生长受抑 ,钙盐代谢障碍 ,生物力学性能降低

 
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