共查询到18条相似文献，搜索用时 500 毫秒
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11名男性学生在跑台上依次参加了递增负荷VO_(2max)测定和4mMol/l乳酸阈测定。恒速负荷最大乳酸稳定状态(MLSS)测定和MLSS气体代谢测定。然后其中7名接受了田径场MLSS强度和大于MLSS强度0.2米/秒运动测试。结果表明:本实验中长时间间歇跑时,在全体受试者中均测得了一个相对的MLSS现象,且MLSS速度与受试者的耐力训练水平呈正相关;本文中MLSS时的VE、VO_2、VE/VO_2、VE/VCO_2与AT强度下的变化规律相同;一定条件下,MLSS速度可转用于田径场运动;4mMol/l阈速度可以大体代表MLSS速度,并可以用作评定个体最大有氧能力的简便指标。 相似文献
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递增工作强度运动时个体无氧阈最大速度的选取及与RPE等级值的关系 总被引：1，自引：0，他引：1
张立 《武汉体育学院学报》1998,(2)
本文研究证明,乳酸阈和通气阈双重拐点结合可作为判断VIATmax的简单可靠方法;较高VO2max相对值和较低心率可使受试者以更快VIAT-max运动而不伴随更多乳酸水平上升;RPE等级值与HLmax、VO2max速度、HRmax和VO2max相关提示RPE受上述生理因素影响。 相似文献
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耐力训练对无氧阈、最大吸氧量和心输出量的影响 总被引：3，自引：0，他引：3
本文纵向观察了10名优秀游泳运动员耐力训练对无氧阈(AT)、最大吸氧量(VO_2max)和心输出量(Q)的影响,并探讨训练引起的AT变化与心功能变化之间的关系。结果发现,游泳运动员经11周耐力训练后,AT时的吸氧量和功率显著提高(p<0.01,P<0.001);AT时的心输出量和每搏量明显增加,且递增负荷运动试验中每搏量稳定时的强度与无氧阈强度密切相关(r=0.88,P<0.01),显示无氧阈不仅反映骨骼肌代谢能力,且与心功能也有很密切的关系。耐力训练后VO_2max无明显改善,提示,用AT评价耐力训练效果较VO_2max更为敏感、准确。 相似文献
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最大耗氧量速度运动时的生理负荷分析及意义 总被引：2，自引：0，他引：2
目的:研究最大耗氧量速度(vVO2max)运动时运动员的生理反应,为中长跑训练处方的制订提供实验依据。方法:对12名中长跑运动员进行一次最大耗氧量(VO2max)递增负荷跑台测试和一次vVO2max力竭性跑台测试,测试受试者的VO2max、vVO2max、Tmax和tlim。结果:vVO2max持续运动中达到的VO2max和递增负荷测试达到的VO2max没有显著差异(P>0.05),且呈高度相关(R=0.857,P<0.01);vVO2max持续运动中,前60%Tmax时间内75%受试者摄氧量达到98%VO2max以上,部分受试者达到甚至超过VO2max。结论:vVO2max是一个有效诱导VO2max产生的强度,vVO2max、Tmax可以作为中长跑训练的参考指标。 相似文献
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儿童最大有氧活动能力的追踪研究 总被引：4，自引：0，他引：4
报告了60名10～15岁儿童(31名男童,29名女童)最大有氧活动能力的追踪研究结果。应用Jaeger LE/6型步行机运动,使用Jaeger自动气体分析仪作气体分析,发现男女童的VO_2max、VO_2max/Ht、VO_2max/Ht~2及VO_2max/HR均随年龄增长而增加,VO_2max/Wt及VO_2max/LBM均未随年龄而增长的规律。男童VO_2max绝对值及各项相对值均明显高于女童。以生活年龄为基础的VO_2max年增长值,男童呈随年龄增长而增加的趋势,女童除13～14岁外,呈随年龄增长而减少的趋势;VO_2max/Wt年增长值男女童在年龄组间均未见到规律性的变化。以身高突增高峰年龄(PHA)为基础的VO_2max,男童从PHA-2到PHS 2持续增加,女童从PHA-1到PHA 1呈下降趋势,以后略有上升;VO_2max/Wt年增长值,男童在PHA前为负值,以后为正值并逐渐增加,女童无规律性变化。以生活年龄或以身高突增高峰年龄为基础的最大吸氧量年增长值的个体差异都很大。 相似文献
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耐力型及速度型运动员40％VO_(2max)稳态运动VO_2动力学特点与有氧运动能力 总被引：1，自引：0，他引：1
结果发现,运动开始后,三组受试者的VO_2皆为逐渐增加达到稳定状态,VO_2的半时反应时间、氧亏、血乳酸的变化皆为有训练者少于无训练者,耐力训练者少于速度训练者。VO_2的半时反应时间与VO_(max)相关(r=-0. 732),氧亏与VO_(2max)相关(r=-0.608),血乳酸的变化量与VO_(2max)相关(r=-0.495),提示恒定负荷稳态运动时,VO_2动力学反应与机体的训练适应有关,其主要指标VO_2的半时反应时间的大小,反映个体的有氧运动能力,可做为评定有氧运动能力的指标。并建议以VO_2半时反应时间间接推测VO_(2max)。 相似文献
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本文通过19名非训练男性受试者比较运动中血乳酸增加的4项指标与有氧能力和12分耐力跑成绩的关系。四项指标如下: 1.乳酸通气阈(LT):即在递增负荷试验中血乳酸开始增加高于安静水平时的摄氧量。 2.乳酸通气阈1(LT 1):血乳酸超过安静水平1mM/L时的摄氧量。 3.乳酸勇气阈2(LT 2):血乳酸(?)M/L时的摄氧量。 4.乳酸积累时象(OBLA):血乳酸达4mM/L时的摄氧量。以上四项参数和最大摄氧量(VO_(2max))分别是14.5±3.7,22.5±4.3,22.2±4.5,30.2±5.2,36.0±5.1毫升·公斤~(-1)·分~(-1)。12分跑平均距离为2356±160米。试验结果是: 1) 各乳酸参数(LT、LT 1、LT 2、OBLA)彼此高度相关。 2) 所有的乳酸参数与VO_(2max)及耐力跑成绩高度相关。 4 项参数中,LT与VO_(2max)相关程度最高,结论是:LT是表示机体有氧能力和耐力水平的最佳指标。 相似文献
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应用近红外光谱技术(NIRS)测定肌肉递增强度工作时肌氧含量变化与最大摄氧量和无氧阈指标之间的关系;分析肌氧拐点与无氧阈拐点产生的机制及在测定最大有氧能力中的作用。方法:受试者17名按运动水平分为A、B两组在功率自行车上以逐级递增负荷蹬车,测定右股外侧肌肌氧含量并同步测量VE、VCO2、VO2、HR,并在每级负荷末测定血乳酸。结果:研究发现递增负荷运动时肌氧含量呈台阶状下降,负荷较低时,肌氧在负荷开始阶段迅速下降之后保持平衡或升高,负荷较高时肌氧持续下降,肌氧的变化与血容量相吻合。肌氧含量与摄氧量、心率及血乳酸等值高度相关(P<0.01)。肌氧下降时出现拐点与乳酸阈、通气阈拐点基本一致。结论:研究表明NIRS测定动态肌肉收缩时肌氧含量变化对运动强度具有较高敏感性;肌氧拐点与通气无氧阈、心率无氧阈、乳酸阈在时间和强度上相一致,表明肌氧含量的测定可以用于人体最大有氧能力的评定。 相似文献
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Dencker M Thorsson O Karlsson MK Lindén C Wollmer P Andersen LB 《Journal of sports sciences》2008,26(13):1397-1402
Maximal oxygen uptake VO(2max)) is considered the optimal method to assess aerobic fitness. The measurement of VO(2max), however, requires special equipment and training. Maximal exercise testing with determination of maximal power output offers a more simple approach. This study explores the relationship between [Vdot]O(2max) and maximal power output in 247 children (139 boys and 108 girls) aged 7.9-11.1 years. Maximal oxygen uptake was measured by indirect calorimetry during a maximal ergometer exercise test with an initial workload of 30 W and 15 W x min(-1) increments. Maximal power output was also measured. A sample (n = 124) was used to calculate reference equations, which were then validated using another sample (n = 123). The linear reference equation for both sexes combined was: VO(2max) (ml x min(-1)) = 96 + 10.6 x maximal power + 3.5 . body mass. Using this reference equation, estimated VO(2max) per unit of body mass (ml x min(-1) x kg(-1)) calculated from maximal power correlated closely with the direct measurement of VO(2max) (r = 0.91, P <0.001). Bland-Altman analysis gave a mean limits of agreement of 0.2+/-2.9 (ml x min(-1) x kg(-1)) (1 s). Our results suggest that maximal power output serves as a good surrogate measurement for VO(2max) in population studies of children aged 8-11 years. 相似文献
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Maximal oxygen uptake and work capacity after inspiratory muscle training: a controlled study 总被引：4，自引：0，他引：4
The effect of inspiratory muscle training for 10 min twice a day for 27.5 days was evaluated in 20 human subjects, of whom 10 formed a training group and 10 a sham training group. The maximal oxygen uptake (VO2 max), maximal ventilation, breathing frequency during maximal exercise and the distance run in 12 min on a track were determined in addition to resting peak expiratory flow, forced vital capacity (FVC) and forced expiratory volume in 1 s (FEV1), with alveolar oxygen tension (pAO2) during maximal exercise being calculated. Inspiratory muscle training increased maximal inspiratory pressure from 93 (range 38-118) to 110 (65-165) mmHg in the training group (P less than 0.0005), but did not affect VO2 max, ventilation during maximal exercise, peak expiratory flow, FEV1 or FVC. However, breathing frequency during maximal exercise decreased slightly from 56 (44-87) to 53 (38-84) breaths min-1 (P less than 0.05) in the training group only; but the calculated pAO2 did not increase from the pre-training value of 126 (116-132) mmHg. The maximal distance run during 12 min increased similarly in the training and sham training groups by 8% (3-12%) and 6% (2-12%), respectively (P less than 0.01). The results of this study show that inspiratory muscle training resulting in a 32% (0-85%) increase in maximal inspiratory pressure does not change FEV1, FVC, peak expiratory flow, VO2 max or work capacity. 相似文献
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Prediction of maximal oxygen uptake in sedentary males from a perceptually regulated, sub-maximal graded exercise test 总被引：2，自引：0，他引：2
The purpose of this study was to assess the validity of predicting the maximal oxygen uptake (VO2(max)) of sedentary men from sub-maximal VO2 values obtained during a perceptually regulated exercise test. Thirteen healthy, sedentary males aged 29-52 years completed five graded exercise tests on a cycle ergometer. The first and fifth test involved a graded exercise test to determine VO2(max). The two maximal graded exercise tests were separated by three sub-maximal graded exercise tests, perceptually regulated at 3-min RPE intensities of 9, 11, 13, 15, and 17 on the Borg ratings of perceived exertion (RPE) scale, in that order. After confirmation that individual linear regression models provided the most appropriate fit to the data, the regression lines for the perceptual ranges 9-17, 9-15, and 11-17 were extrapolated to RPE 20 to predict VO2(max). There were no significant differences between VO2(max) values from the graded exercise tests (mean 43.9 ml x kg(-1) x min(-1), s = 6.3) and predicted VO2(max) values for the perceptual ranges 9-17 (40.7 ml x kg(-1) x min(-1), s = 2.2) and RPE 11-17 (42.5 ml x kg(-1) x min(-1), s = 2.3) across the three trials. The predicted VO2(max) from the perceptual range 9-15 was significantly lower (P < 0.05) (37.7 ml x kg(-1) x min(-1), s = 2.3). The intra-class correlation coefficients between actual and predicted VO2(max) for RPE 9-17 and RPE 11-17 across trials ranged from 0.80 to 0.87. Limits of agreement analysis on actual and predicted VO2 values (bias +/- 1.96 x S(diff)) were 3.4 ml x kg(-1) x min(-1) (+/- 10.7), 2.4 ml x kg(-1) x min(-1) (+/- 9.9), and 3.7 ml x kg(-1) x min(-1) (+/- 12.8) (trials 1, 2, and 3, respectively) of RPE range 9-17. Results suggest that a sub-maximal, perceptually guided graded exercise test provides acceptable estimates of VO2(max) in young to middle-aged sedentary males. 相似文献
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Bartlett JD Close GL MacLaren DP Gregson W Drust B Morton JP 《Journal of sports sciences》2011,29(6):547-553
The aim of this study was to objectively quantify ratings of perceived enjoyment using the Physical Activity Enjoyment Scale following high-intensity interval running versus moderate-intensity continuous running. Eight recreationally active men performed two running protocols consisting of high-intensity interval running (6 × 3 min at 90% VO(2max) interspersed with 6 × 3 min active recovery at 50% VO(2max) with a 7-min warm-up and cool down at 70% VO(2max)) or 50 min moderate-intensity continuous running at 70% VO(2max). Ratings of perceived enjoyment after exercise were higher (P < 0.05) following interval running compared with continuous running (88 ± 6 vs. 61 ± 12) despite higher (P < 0.05) ratings of perceived exertion (14 ± 1 vs. 13 ± 1). There was no difference (P < 0.05) in average heart rate (88 ± 3 vs. 87 ± 3% maximum heart rate), average VO(2) (71 ± 6 vs. 73 ± 4%VO(2max)), total VO(2) (162 ± 16 vs. 166 ± 27 L) or energy expenditure (811 ± 83 vs. 832 ± 136 kcal) between protocols. The greater enjoyment associated with high-intensity interval running may be relevant for improving exercise adherence, since running is a low-cost exercise intervention requiring no exercise equipment and similar relative exercise intensities have previously induced health benefits in patient populations. 相似文献
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Non-exercise equations developed from self-reported physical activity can estimate maximal oxygen uptake (VO(2)max) as well as submaximal exercise testing. The International Physical Activity Questionnaire (IPAQ) is the most widely used and validated self-report measure of physical activity. This study aimed to develop and test a VO(2)max estimation equation derived from the IPAQ-Short Form (IPAQ-S). College-aged males and females (n = 80) completed the IPAQ-S and performed a maximal exercise test. The estimation equation was created with multivariate regression in a gender-balanced subsample of participants, equally representing five levels of fitness (n = 50) and validated in the remaining participants (n = 30). The resulting equation explained 43% of the variance in measured VO(2)max (SEE = 5.45 ml·kg(-1)·min(-1)). Estimated VO(2)max for 87% of individuals fell within acceptable limits of error observed with submaximal exercise testing (20% error). The IPAQ-S can be used to successfully estimate VO(2)max as well as submaximal exercise tests. Development of other population-specific estimation equations is warranted. 相似文献
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Bradshaw DI George JD Hyde A LaMonte MJ Vehrs PR Hager RL Yanowitz FG 《Research quarterly for exercise and sport》2005,76(4):426-432
The purpose of this study was to develop a regression equation to predict maximal oxygen uptake (VO2max) based on nonexercise (N-EX) data. All participants (N = 100), ages 18-65 years, successfully completed a maximal graded exercise test (GXT) to assess VO2max (M = 39.96 mL x kg(-1) x min(-1), SD = 9.54). The N-EX data collected just before the maximal GXT included the participant's age; gender; body mass index (BMI); perceived functional ability (PFA) to walk, jog, or run given distances; and current physical activity (PA-R) level. Multiple linear regression generated the following N-EX prediction equation (R = .93, SEE = 3.45 mL x kg(-1) x min(-1), % SEE = 8.62): VO2max (mL x kg(-1) x min(-1)) = 48.0730 + (6.1779 x gender; women = 0, men = 1) - (0. 2463 x age) - (0.6186 x BMI) + (0.7115 x PFA) + (0.6709 x PA-R). Cross validation using PRESS (predicted residual sum of squares) statistics revealed minimal shrinkage (R(p) = .91 and SEE(p) = 3.63 mL x kg(-1) x min(-1)); thus, this model should yield acceptable accuracy when applied to an independent sample of adults (ages 18-65 years) with a similar cardiorespiratory fitness level. Based on standardized beta-weights, the PFA variable (0.41) was the most effective at predicting VO2max followed by age (-0.34), gender (0.33), BMI (-0.27), and PA-R (0.16). This study provides a N-EX regression model that yields relatively accurate results and is a convenient way to predict VO2max in adult men and women. 相似文献