Astorino Todd A
Department of Kinesiology, CSU-San Marcos, San Marcos, USA.
Spinal Cord Ser Cases. 2019 Jan 15;5:2. doi: 10.1038/s41394-018-0145-9. eCollection 2019.
Repeated measures within-subjects crossover study.
High intensity interval exercise (HIIE) elicits higher oxygen consumption (VO) and heart rate (HR) versus moderate intensity continuous exercise (MICE) in men with spinal cord injury (SCI). No study has compared hemodynamic responses to HIIE versus MICE in SCI. In this study, we determined hemodynamic and cardiorespiratory responses to different bouts of arm cycling in men with SCI.
Human Performance Laboratory, San Diego, CA.
Five men (age and injury duration = 42.6 ± 16.1 yr and 9.9 ± 7.6 yr) with SCI participated in the study. VOpeak and peak power output were initially assessed. Subsequent visits included MICE, HIIE, sprint interval exercise (SIE), and a no-exercise control (CON). Energy expenditure was matched across modes and equal to 100 ± 10 kcal. During the bouts, cardiac output (CO), stroke volume (SV), HR, and VO were measured.
Heart rate, SV, and CO increased in response to all exercise bouts and were higher during exercise versus CON. During HIIE and SIE, heart rate approached 90% of maximum, and stroke volume increased by 40% which was higher ( < 0.05) versus MICE and CON. In addition, exercise led to a two (MICE) to threefold increase in CO (HIIE and SIE) although it was not different from CON. VO during SIE and HIIE was higher ( < 0.05) versus MICE.
Similar to results in non-disabled populations, HIIE and SIE elicit near-maximal values of SV and CO.
受试者内重复测量交叉研究。
与中等强度持续运动（MICE）相比，高强度间歇运动（HIIE）在脊髓损伤（SCI）男性中引发更高的耗氧量（VO）和心率（HR）。尚无研究比较SCI患者对HIIE和MICE的血流动力学反应。在本研究中，我们确定了SCI男性对不同组次手臂骑行运动的血流动力学和心肺反应。
加利福尼亚州圣地亚哥人体性能实验室。
五名患有SCI的男性（年龄和损伤持续时间分别为42.6±16.1岁和9.9±7.6岁）参与了该研究。最初评估了峰值摄氧量（VOpeak）和峰值功率输出。后续访视包括MICE、HIIE、冲刺间歇运动（SIE）以及无运动对照（CON）。各运动模式下的能量消耗相匹配，均等于100±10千卡。在运动组次期间，测量心输出量（CO）、每搏输出量（SV）、心率（HR）和VO。
所有运动组次均使心率、SV和CO升高，且运动期间高于CON组。在HIIE和SIE期间，心率接近最大值的90%，每搏输出量增加40%，高于MICE组和CON组（P<0.05）。此外，运动使CO增加了两倍（MICE组）至三倍（HIIE组和SIE组），尽管与CON组无差异。SIE和HIIE期间的VO高于MICE组（P<0.05）。
与非残疾人群的结果相似，HIIE和SIE引发接近最大的SV和CO值。
