Sirindhorn School of Prosthetics and Orthotics, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand.
Department of Counseling, Health & Kinesiology, Texas A&M University-San Antonio, San Antonio, TX 78244, USA.
Sensors (Basel). 2021 Oct 19;21(20):6917. doi: 10.3390/s21206917.
The HUMAC Balance System (HBS) offers valid measurement of balance, and the arm crank exercise test (ACE) is a valid measure of physiological capacity. Neither have been used to evaluate associations between balance and physiological capacity in lower-limb amputees.
Thirty-five participants with lower-limb amputations were recruited. Standing balance (center of pressure) was evaluated during eyes opened (EO) and eyes closed (EC) conditions using the HBS. Participants performed ACE graded exercise testing (GXT) to evaluate aerobic capacity. Spearman's was used to identify relationships between variables. Cut-points for three groups were generated for time on ACE. Mann-Whitney tests were used to explore significant differences in variables of balance and ACE between low and high performers.
Relationships between variables of eyes open displacement (EOD), eyes open velocity (EOV), eyes closed displacement (ECD), and eyes closed velocity (ECV) were significant ( < 0.05), and high performers with EO also performed best with EC. Longer exercise times were significantly associated with increased HR, VO, VE, and RER ( < 0.05). HR (143.0 ± 30.6 b/min), VO (22.7 ± 7.9 and 10.6 ± 4.7 mL/kg/min), VE (80.2 ± 22.2 and 33.2 ± 12.7 L/min), and RER (1.26 ± 0.08 and 1.13 ± 0.11) were significantly greater in high performers than low performers, respectively ( < 0.05). There was no significant association among VO and any balance task variables; however, there were significant associations between some balance and physiological variables.
Findings differentiated high and low performers; however, participants were still well below able-bodied norms of physical capacity. Training to mitigate deconditioning is suggested.
HUMAC 平衡系统（HBS）可提供平衡的有效测量，而手臂曲柄运动测试（ACE）是生理能力的有效测量。两者都未用于评估下肢截肢者的平衡与生理能力之间的关系。
招募了 35 名下肢截肢者。使用 HBS 在睁眼（EO）和闭眼（EC）条件下评估站立平衡（压力中心）。参与者进行 ACE 分级运动测试（GXT）以评估有氧能力。使用 Spearman's 来确定变量之间的关系。为 ACE 时间生成了三组的截止值。使用 Mann-Whitney 检验探索低和高表现者之间平衡和 ACE 变量的显着差异。
睁眼位移（EOD）、睁眼速度（EOV）、闭眼位移（ECD）和闭眼速度（ECV）的变量之间存在显著关系（<0.05），并且 EO 高表现者在 EC 中表现也最佳。更长的运动时间与更高的 HR、VO、VE 和 RER 显著相关（<0.05）。高表现者的 HR（143.0 ± 30.6 b/min）、VO（22.7 ± 7.9 和 10.6 ± 4.7 mL/kg/min）、VE（80.2 ± 22.2 和 33.2 ± 12.7 L/min）和 RER（1.26 ± 0.08 和 1.13 ± 0.11）分别显著高于低表现者（<0.05）。VO 与任何平衡任务变量之间没有显着关联；然而，一些平衡和生理变量之间存在显着关联。
研究结果区分了高表现者和低表现者；然而，参与者的身体能力仍然远低于健全人的标准。建议进行康复训练以减轻失能。
