Laboratory of Physical Activity and Health Promotion (LABSAU), Physical Education and Sports Institute, Rio de Janeiro State University (UERJ), Rua São Francisco Xavier 524, Maracanã-RJ, Brazil.
Eur J Appl Physiol. 2010 Jun;109(3):379-88. doi: 10.1007/s00421-010-1366-1. Epub 2010 Feb 3.
Cardio-respiratory responses of young and older subjects performing walking and running protocols at the walk-run transition speed (WRT) were compared. A total of 26 volunteers assigned to younger (YG, 24 +/- 3 years) and older (OG, 64 +/- 6 years) groups underwent a protocol to determine the WRT used in 6-min walking and running protocols. Oxygen uptake (VO(2)), ventilation (V (E)), expired carbon dioxide (VCO(2)), heart rate (HR) and perceived exertion (RPE) were assessed. Oxygen pulse (O(2) pulse) and respiratory exchange ratio (RER) were calculated. The WRT was not different between groups (OG: 6.84 +/- 0.69 km h(-1) vs. YG: 7.04 +/- 0.77 km h(-1), P = 0.62). No between-group differences were found within a given gait pattern for VO(2) (P = 0.061) and VCO(2) (P = 0.076). However, VO(2) (P = 0.0022) and VCO(2) (P = 0.0041) increased in OG when running, remaining stable in YG (VO(2): P = 0.622; VCO(2): P = 0.412). The VE was higher in OG compared to YG in walking (P = 0.030) and running (P = 0.004) protocols. No age-related (P = 0.180) or locomotion (P = 0.407) effects were found for RER. The HR increased in OG and between-group difference was detected while running (P = 0.003). No within- (P = 0.447) or between-group (P = 0.851) difference was found for O(2) pulse. The net VO(2) increased from walking to running in OG (P < 0.0001) but not in YG (P = 0.53), while RPE was lower in YG (P = 0.041) but stable in OG (P = 0.654). In conclusion, the WRT speed was similar across the age groups. However, the VO(2) and VCO(2) increase from walking to running was larger for OG than YG. The HR, VE and RPE were also higher when running in OG compared to YG. Therefore, the locomotion strategy had different impacts on the metabolic demand of older and younger subjects.
比较了在行走-跑步转换速度 (WRT) 下进行行走和跑步方案时年轻和老年受试者的心肺反应。共有 26 名志愿者分为年轻组 (YG，24 +/- 3 岁) 和老年组 (OG，64 +/- 6 岁)，他们进行了一项确定用于 6 分钟步行和跑步方案的 WRT 的方案。评估了摄氧量 (VO(2))、通气量 (V (E))、呼出的二氧化碳量 (VCO(2))、心率 (HR) 和感觉用力 (RPE)。计算了氧脉冲 (O(2) 脉冲) 和呼吸交换率 (RER)。两组之间的 WRT 没有差异 (OG：6.84 +/- 0.69 km h(-1) vs. YG：7.04 +/- 0.77 km h(-1)，P = 0.62)。在给定的步态模式下，VO(2) (P = 0.061) 和 VCO(2) (P = 0.076) 内没有组间差异。然而，当 OG 跑步时，VO(2) (P = 0.0022) 和 VCO(2) (P = 0.0041) 增加，而 YG 保持稳定 (VO(2)：P = 0.622；VCO(2)：P = 0.412)。与 YG 相比，OG 在行走 (P = 0.030) 和跑步 (P = 0.004) 方案中 VE 更高。没有年龄相关的 (P = 0.180) 或运动相关的 (P = 0.407) RER 影响。OG 中的 HR 增加，跑步时检测到组间差异 (P = 0.003)。OG 中没有 (P = 0.447) 或组间 (P = 0.851) 差异 O(2) 脉冲。OG 从行走到跑步时净 VO(2) 增加 (P < 0.0001)，但 YG 没有 (P = 0.53)，而 YG 的 RPE 较低 (P = 0.041)，但 OG 稳定 (P = 0.654)。总之，两个年龄组的 WRT 速度相似。然而，OG 从行走到跑步的 VO(2) 和 VCO(2) 增加大于 YG。与 YG 相比，OG 跑步时的 HR、VE 和 RPE 也更高。因此，运动策略对老年和年轻受试者的代谢需求有不同的影响。
