目的:研究采用中等强度范围一次递增负荷跑台运动过程中的主观感觉等级(RPE)和心率(HR)来预测最大耗氧量(VO2max)的可靠性。方法:体育专业大学生22名(男生10名,女生12名)在中等强度范围完成跑台递增负荷运动,测定不同运动负荷阶段的RPE...目的:研究采用中等强度范围一次递增负荷跑台运动过程中的主观感觉等级(RPE)和心率(HR)来预测最大耗氧量(VO2max)的可靠性。方法:体育专业大学生22名(男生10名,女生12名)在中等强度范围完成跑台递增负荷运动,测定不同运动负荷阶段的RPE等级、心率以及耗氧量(VO2),分别采用RPE等级9和13及其对应VO2、RPE等级9和15及其对应的VO2建立RPE等级与VO2的线性模型,然后,以此线性模型确定RPE20和RPE19所对应的VO2即为VO2max预测值;同样,在中等强度范围内,分别采用RPE等级9和13、RPE等级9和15所对应的心率与VO2建立心率与VO2之间的线性模型,然后,确定最大心率所对应的VO2即为VO2max预测值,其中,最大心率分别采用220-年龄和206.9-0.67×年龄来计算。结果:1)从预测值与测试值的比较来看,RPE9-13(RPE20)(表示线性方程采用RPE9和RPE13来建立,预测点为RPE20,下同)、RPE9-15(RPE20)、RPE9-15(RPE19)、HR9-13(220-年龄)、HR9-13(206.9-0.67×年龄)、HR9-15(220-年龄)的VO2max预测值与实际测试值均无显著差异。2)从Pearson相关来看,RPE9-13(RPE20)、RPE9-13(RPE19)、RPE9-15(RPE20)和RPE9-15(RPE19)的VO2max预测值与实际测试值之间存在一定相关,其中,RPE9-13(RPE20)和RPE9-13(RPE19)的VO2max预测值与实际测试值之间的相关系数较高(r>0.90,P<0.001);而心率VO2max预测值与实际测试值的相关系数较低(r<0.60)。3)从组内相关结果来看,RPE9-13(RPE20)、RPE9-13(RPE19)、RPE9-15(RPE20)、RPE9-15(RPE19)的VO2max预测值与实际测试值组内相关系数(intra-class correlation coefficient,ICC)均在0.80以上(P<0.01),其中,RPE9-13(RPE20)和RPE9-13(RPE19)的VO2max预测值与实际测试值之间的组内相关系数较高(ICC>0.90,P<0.001),而心率VO2max预测值与实际测试值的组内相关系数较低。4)Bland-Altman法及一致性限度(limits of agreement,95%LoA)分析结果表明,心率预测值与实际测试值的一致性限度范围较大,而RPE预测值与实测值的一致性范围相对较窄,其中一致性最好的是RPE9-13(RPE20),其95%LoA分别为0.49±5.08(男)、-0.43±6.25(女)和-0.01±5.68(男女综合)。结论:采用一次中等强度递增负荷跑台运动过程的RPE等级来预测机体VO2max水平具有一定可靠性,其中RPE9-13扩展至RPE20所预测的VO2max的准确性最高。展开更多
Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal contraction.Methods: Ten men with ID were compared to 10 men...Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal contraction.Methods: Ten men with ID were compared to 10 men without ID. The evaluation of neuromuscular function consisted in brief(3 s) isometric maximal voluntary contraction(IMVC) of the knee extension superimposed with electrical nerve stimulation before, immediately after, and during33 min after an exhausting submaximal isometric task at 15% of the IMVC. Force, voluntary activation level(VAL), potentiated twitch(Ptw), and electromyography(EMG) signals were measured during IMVC and then analyzed.Results: Individuals with ID developed lower baseline IMVC, VAL, Ptw; and RMS/M_(max) ratio(root-mean-square value normalized to the maximal peak-to-peak amplitude of the M-wave) than controls(p < 0.05). Nevertheless, the time to task failure was significantly longer in ID vs. controls(p < 0.05). The 2 groups presented similar IMVC decline and recovery kinetics after the fatiguing exercise. However. individuals with ID presented higher VAL and RMS/M_(max) ratio declines but lower Ptw decline compared to those without ID. Moreover, individuals with ID demonstrated a persistent central fatigue but faster recovery from peripheral fatigue.Conclusion: These differences in neuromuscular fatigue profiles and recovery kinetics should be acknowledged when prescribing training programs for individuals with ID.展开更多
探讨急性亚极量运动诱发机体免疫抑制蛋白(Immune Suppressive Protein of Stress,ISPS)出现的最短时间。方法:以北京体育大学研究生院8名健康学生为研究对象,实施急性亚极量强度跑台运动,受试者分别于运动前、运动后24 h无菌采集静脉...探讨急性亚极量运动诱发机体免疫抑制蛋白(Immune Suppressive Protein of Stress,ISPS)出现的最短时间。方法:以北京体育大学研究生院8名健康学生为研究对象,实施急性亚极量强度跑台运动,受试者分别于运动前、运动后24 h无菌采集静脉血进行指标测定。结果发现,急性亚极量运动后24 h机体内ISPS水平升高,证实在急性运动后短至24 hISPS就能在人体内被诱导出现。结论:与运动前相比,急性亚极量运动应激24 h后,受试者血清对正常小鼠ConA诱导的淋巴细胞增殖具有明显的抑制作用,是血清中ISPS蛋白水平升高引起。展开更多
文摘目的:研究采用中等强度范围一次递增负荷跑台运动过程中的主观感觉等级(RPE)和心率(HR)来预测最大耗氧量(VO2max)的可靠性。方法:体育专业大学生22名(男生10名,女生12名)在中等强度范围完成跑台递增负荷运动,测定不同运动负荷阶段的RPE等级、心率以及耗氧量(VO2),分别采用RPE等级9和13及其对应VO2、RPE等级9和15及其对应的VO2建立RPE等级与VO2的线性模型,然后,以此线性模型确定RPE20和RPE19所对应的VO2即为VO2max预测值;同样,在中等强度范围内,分别采用RPE等级9和13、RPE等级9和15所对应的心率与VO2建立心率与VO2之间的线性模型,然后,确定最大心率所对应的VO2即为VO2max预测值,其中,最大心率分别采用220-年龄和206.9-0.67×年龄来计算。结果:1)从预测值与测试值的比较来看,RPE9-13(RPE20)(表示线性方程采用RPE9和RPE13来建立,预测点为RPE20,下同)、RPE9-15(RPE20)、RPE9-15(RPE19)、HR9-13(220-年龄)、HR9-13(206.9-0.67×年龄)、HR9-15(220-年龄)的VO2max预测值与实际测试值均无显著差异。2)从Pearson相关来看,RPE9-13(RPE20)、RPE9-13(RPE19)、RPE9-15(RPE20)和RPE9-15(RPE19)的VO2max预测值与实际测试值之间存在一定相关,其中,RPE9-13(RPE20)和RPE9-13(RPE19)的VO2max预测值与实际测试值之间的相关系数较高(r>0.90,P<0.001);而心率VO2max预测值与实际测试值的相关系数较低(r<0.60)。3)从组内相关结果来看,RPE9-13(RPE20)、RPE9-13(RPE19)、RPE9-15(RPE20)、RPE9-15(RPE19)的VO2max预测值与实际测试值组内相关系数(intra-class correlation coefficient,ICC)均在0.80以上(P<0.01),其中,RPE9-13(RPE20)和RPE9-13(RPE19)的VO2max预测值与实际测试值之间的组内相关系数较高(ICC>0.90,P<0.001),而心率VO2max预测值与实际测试值的组内相关系数较低。4)Bland-Altman法及一致性限度(limits of agreement,95%LoA)分析结果表明,心率预测值与实际测试值的一致性限度范围较大,而RPE预测值与实测值的一致性范围相对较窄,其中一致性最好的是RPE9-13(RPE20),其95%LoA分别为0.49±5.08(男)、-0.43±6.25(女)和-0.01±5.68(男女综合)。结论:采用一次中等强度递增负荷跑台运动过程的RPE等级来预测机体VO2max水平具有一定可靠性,其中RPE9-13扩展至RPE20所预测的VO2max的准确性最高。
文摘Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal contraction.Methods: Ten men with ID were compared to 10 men without ID. The evaluation of neuromuscular function consisted in brief(3 s) isometric maximal voluntary contraction(IMVC) of the knee extension superimposed with electrical nerve stimulation before, immediately after, and during33 min after an exhausting submaximal isometric task at 15% of the IMVC. Force, voluntary activation level(VAL), potentiated twitch(Ptw), and electromyography(EMG) signals were measured during IMVC and then analyzed.Results: Individuals with ID developed lower baseline IMVC, VAL, Ptw; and RMS/M_(max) ratio(root-mean-square value normalized to the maximal peak-to-peak amplitude of the M-wave) than controls(p < 0.05). Nevertheless, the time to task failure was significantly longer in ID vs. controls(p < 0.05). The 2 groups presented similar IMVC decline and recovery kinetics after the fatiguing exercise. However. individuals with ID presented higher VAL and RMS/M_(max) ratio declines but lower Ptw decline compared to those without ID. Moreover, individuals with ID demonstrated a persistent central fatigue but faster recovery from peripheral fatigue.Conclusion: These differences in neuromuscular fatigue profiles and recovery kinetics should be acknowledged when prescribing training programs for individuals with ID.
文摘探讨急性亚极量运动诱发机体免疫抑制蛋白(Immune Suppressive Protein of Stress,ISPS)出现的最短时间。方法:以北京体育大学研究生院8名健康学生为研究对象,实施急性亚极量强度跑台运动,受试者分别于运动前、运动后24 h无菌采集静脉血进行指标测定。结果发现,急性亚极量运动后24 h机体内ISPS水平升高,证实在急性运动后短至24 hISPS就能在人体内被诱导出现。结论:与运动前相比,急性亚极量运动应激24 h后,受试者血清对正常小鼠ConA诱导的淋巴细胞增殖具有明显的抑制作用,是血清中ISPS蛋白水平升高引起。