Mendonça Gonçalo V, Pereira Fernando D, Fernhall Bo
Human Kinetics Department, Faculty of Human Kinetics, Technical University of Lisbon, Lisbon, Portugal.
Eur J Appl Physiol. 2009 Jan;105(1):153-7. doi: 10.1007/s00421-008-0884-6. Epub 2008 Oct 11.
The purpose of this study was to investigate walking economy in response to steady-state locomotion in adult males with Down syndrome (DS) and in healthy controls. Twelve participants with DS (34.5 +/- 7.0 years) and 11 non-disabled controls (34.3 +/- 8.7 years) performed submaximal (0% grade, 2.5 km h(-1) for 8 min) and maximal treadmill tests with metabolic and heart-rate measurements. For submaximal walking, submaximal oxygen uptake (VO(2)) (9.1 vs. 9.5 mL kg(-1) min(-1)), net VO(2) (5.9 vs. 5.4 mL kg(-1) min(-1)) were not different between the groups (P > 0.05). However, oxygen-pulse (6.6 vs. 8.6 mL/beat) was lower and relative work intensity (44.6 vs. 19.9% of max) was higher in individuals with DS compared to controls (P < 0.05). Findings indicate similar walking economy between groups. Nevertheless, participants with DS exercised at lower submaximal oxygen-pulse and higher percentage of VO(2peak). Therefore, despite similar walking economy, participants with DS have lower cardiorespiratory function than controls for a given steady-state treadmill speed.
本研究的目的是调查唐氏综合征（DS）成年男性和健康对照者在稳态运动时的步行经济性。12名DS患者（34.5±7.0岁）和11名非残疾对照者（34.3±8.7岁）进行了次最大强度（0%坡度，2.5 km/h，持续8分钟）和最大强度的跑步机测试，并测量了代谢和心率。对于次最大强度步行，两组之间的次最大摄氧量（VO₂）（9.1对9.5 mL·kg⁻¹·min⁻¹）、净VO₂（5.9对5.4 mL·kg⁻¹·min⁻¹）没有差异（P>0.05）。然而，与对照组相比，DS患者的氧脉搏（6.6对8.6 mL/次心跳）较低，相对工作强度（最大强度的44.6对19.9%）较高（P<0.05）。研究结果表明两组之间的步行经济性相似。然而，DS患者在次最大强度氧脉搏较低且VO₂峰值百分比较高的情况下进行运动。因此，尽管步行经济性相似，但在给定的稳态跑步机速度下，DS患者的心肺功能低于对照组。
