Dourado V Z, Guerra R L F
Universidade Federal de São Paulo, Laboratório de Estudos da Motricidade Humana, Departamento de Ciências do Movimento Humano, Santos, SP, Brasil.
Braz J Med Biol Res. 2013 Feb;46(2):194-9. doi: 10.1590/1414-431x20122376. Epub 2013 Feb 1.
Studies on the assessment of heart rate variability threshold (HRVT) during walking are scarce. We determined the reliability and validity of HRVT assessment during the incremental shuttle walk test (ISWT) in healthy subjects. Thirty-one participants aged 57 ± 9 years (17 females) performed 3 ISWTs. During the 1st and 2nd ISWTs, instantaneous heart rate variability was calculated every 30 s and HRVT was measured. Walking velocity at HRVT in these tests (WV-HRVT1 and WV-HRVT2) was registered. During the 3rd ISWT, physiological responses were assessed. The ventilatory equivalents were used to determine ventilatory threshold (VT) and the WV at VT (WV-VT) was recorded. The difference between WV-HRVT1 and WV-HRVT2 was not statistically significant (median and interquartile range = 4.8; 4.8 to 5.4 vs 4.8; 4.2 to 5.4 km/h); the correlation between WV-HRVT1 and WV-HRVT2 was significant (r = 0.84); the intraclass correlation coefficient was high (0.92; 0.82 to 0.96), and the agreement was acceptable (-0.08 km/h; -0.92 to 0.87). The difference between WV-VT and WV-HRVT2 was not statistically significant (4.8; 4.8 to 5.4 vs 4.8; 4.2 to 5.4 km/h) and the agreement was acceptable (0.04 km/h; -1.28 to 1.36). HRVT assessment during walking is a reliable measure and permits the estimation of VT in adults. We suggest the use of the ISWT for the assessment of exercise capacity in middle-aged and older adults.
关于步行过程中心率变异性阈值（HRVT）评估的研究较少。我们确定了在健康受试者的递增穿梭步行试验（ISWT）中HRVT评估的可靠性和有效性。31名年龄为57±9岁的参与者（17名女性）进行了3次ISWT。在第1次和第2次ISWT期间，每30秒计算一次瞬时心率变异性并测量HRVT。记录这些测试中HRVT时的步行速度（WV-HRVT1和WV-HRVT2）。在第3次ISWT期间，评估生理反应。使用通气当量来确定通气阈值（VT）并记录VT时的WV（WV-VT）。WV-HRVT1和WV-HRVT2之间的差异无统计学意义（中位数和四分位间距=4.8；4.8至5.4对4.8；4.2至5.4公里/小时）；WV-HRVT1和WV-HRVT2之间的相关性显著（r = 0.84）；组内相关系数较高（0.92；0.82至0.96），一致性可接受（-0.08公里/小时；-0.92至0.87）。WV-VT和WV-HRVT2之间的差异无统计学意义（4.8；4.8至5.4对4.8；4.2至5.4公里/小时），一致性可接受（0.04公里/小时；-1.28至1.36）。步行过程中的HRVT评估是一种可靠的测量方法，可用于估计成年人的VT。我们建议使用ISWT来评估中年和老年人的运动能力。
