Gates Phillip E, Campbell Ian G, George Keith P
Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager Faculty, Cheshire, United Kingdom.
Med Sci Sports Exerc. 2002 Nov;34(11):1699-704. doi: 10.1097/00005768-200211000-00002.
The distinctive nature of left ventricular (LV) adaptation reported in able-bodied endurance- and power-trained athletes probably reflects the different hemodynamic loading patterns that occur during acute exercise. The exercise-induced hemodynamic loads in spinal cord injured athletes are different to those in able-bodied counterparts (lower venous return and stroke volume, higher heart rate). We sought to test the hypothesis that wall thickness, but not chamber dimension, would be larger in endurance- and power-trained spinal cord injured athletes compared with sedentary spinal cord injured subjects.
We undertook resting two-dimensional, motion-mode, and Doppler examinations of 11 power-trained, 10 endurance-trained, and 5 sedentary spinal cord injured volunteers and compared structural and functional LV data by using ANOVA. LV structural data were also analyzed after being scaled to body mass (BM)(0.33).
There were no statistically significant differences among groups for any of the LV structural or functional measurements. However, there was a trend for larger mean wall thickness (0.95 +/- 0.12 vs 0.83 +/- 0.10 cm) and left ventricular mass (193 +/- 57 vs 164 +/- 66 g) in athletes compared with sedentary individuals.
It seems unlikely that endurance and power training elicits distinctive patterns of LV enlargement in spinal cord injured athletes. Small adaptations of the left ventricle may occur with athletic training in the spinal cord injured athlete. Research within this population is complicated by extreme heterogeneity in important physical, physiological, and athletic-related variables.
在身体健全的耐力和力量训练运动员中报道的左心室（LV）适应的独特性质可能反映了急性运动期间发生的不同血流动力学负荷模式。脊髓损伤运动员运动诱导的血流动力学负荷与身体健全的运动员不同（静脉回流和每搏输出量较低，心率较高）。我们试图检验这样一个假设：与久坐不动的脊髓损伤受试者相比，耐力和力量训练的脊髓损伤运动员的心室壁厚度会更大，但心室腔尺寸不会增大。
我们对11名力量训练、10名耐力训练和5名久坐不动的脊髓损伤志愿者进行了静息二维、运动模式和多普勒检查，并使用方差分析比较左心室的结构和功能数据。左心室结构数据在按体重（BM）（0.33）进行标化后也进行了分析。
在任何左心室结构或功能测量指标上，各组之间均无统计学显著差异。然而，与久坐不动的个体相比，运动员的平均心室壁厚度（0.95±0.12 vs 0.83±0.10 cm）和左心室质量（193±57 vs 164±66 g）有增大的趋势。
耐力和力量训练似乎不太可能在脊髓损伤运动员中引起左心室增大的独特模式。脊髓损伤运动员的运动训练可能会使左心室发生微小的适应性变化。该人群的研究因重要身体、生理和运动相关变量的极端异质性而变得复杂。
