Hoffmann U, Essfeld D, Wunderlich H G, Stegemann J
Physiologisches Institut, Deutschen Sporthochschule Köln.
Z Kardiol. 1994;83 Suppl 3:57-60.
The PRBS-technique is a useful tool to investigate muscle VO2 kinetics within the aerobic range. However, the validity of this kind of multi-frequent testing may be limited by non-linearities generated by the circulatory and pulmonary system. To check for such non-linear effects we compared the frequency responses computed from the multi-frequent PRBS with the results of pure sinusoidal testings (periods between 75 s and 450 s). Both methods show a good agreement for periods in the range between 113 s and 450 s. For shorter periods the results slightly diverged. The harmonic analyses of the sinusoidal data indicate increased stimulation of higher harmonics with increase in frequency. It is concluded that the VO2 in the lower frequency range shows only little, if any, influence of the circulatory and pulmonary system. Differences between the methods in the higher frequency range may be caused by non-linearities at the same or even lower frequencies. Therefore, periods shorter than 100 s are not suitable for assessing the muscle VO2 kinetics.
伪随机二进制序列（PRBS）技术是研究有氧范围内肌肉耗氧量（VO₂）动力学的一种有用工具。然而，这种多频测试的有效性可能会受到循环系统和呼吸系统产生的非线性因素的限制。为了检查此类非线性效应，我们将多频PRBS计算得到的频率响应与纯正弦测试（周期在75秒至450秒之间）的结果进行了比较。两种方法在113秒至450秒范围内的周期显示出良好的一致性。对于较短的周期，结果略有差异。正弦数据的谐波分析表明，随着频率增加，高次谐波的刺激增加。得出的结论是，在较低频率范围内，VO₂受循环系统和呼吸系统的影响很小（如果有影响的话）。在较高频率范围内，两种方法之间的差异可能是由相同甚至更低频率下的非线性因素引起的。因此，短于100秒的周期不适合评估肌肉VO₂动力学。
