#Measure frequency of values in statplus code

In conclusion, arterial hyperkalemia was sustained during exhaustive rowing reflecting a balance between K + release and reuptake in contracting muscles and K + uptake by inactive muscles. At end exercise, blood a (preexercise 0.64 ± 0.18 mM) reached 10.87 ± 1.33 mM, plasma volume decreased 9.7 ± 2.3% from preexercise, and pH a decreased to 7.10 ± 0.07 units ( P < 0.001). In recovery, a decreased abruptly, reaching 3.33 ± 0.22 mM at 5 min postexercise ( P < 0.001) and remaining below preexercise after 30 min ( P < 0.005). Plasma a increased from 3.89 ± 0.13 mM at rest to 6.13 ± 0.46 mM by 90 s rowing ( P < 0.001) and was then sustained until end exercise ( P < 0.001). With exercise time expressed in deciles, power output fell 16.5% from the first to fourth decile ( P < 0.05) and 19.9% at the ninth decile ( P < 0.05) EMG median frequency declined 4.6% by the third decile and 5.5% by the eighth decile ( P < 0.05). Time to complete 2,000 m was 7.26 ± 0.59 min power output at 30 s was 326 ± 81 W (mean ± SD). Blood was sampled at baseline, preexercise, each 30 s during rowing, and for 30 min postexercise.

#Measure frequency of values in statplus code

**This document has been updated to meet the current required format for the NI Code Exchange.**Įxample code from the Example Code Exchange in the NI Community is licensed with the MIT license.We investigated whether potassium (K +) disturbances during and following intense exercise may be pronounced when utilizing a large contracting muscle mass, examining maximal 2,000-m rowing exercise effects on radial arterial plasma K + concentration ( a) in 11 healthy adults. Get more info here: Making Accurate Frequency Measurements Set Channel Parameters and Timing Parameters.With this frequency method, the larger the divide down value, the slower the resulting frequency, and more accurate the measurement result. The actual frequency can be calculated by multiplying the resulting frequency measurement by the divide down value. The first counter is used to divide down the frequency of the signal to be measured then the second counter is used to measure the period of the divide down frequency. Similar to measurement method 2, count number of pulses in known time, this measurement method also uses two counters. However, if your application involves measuring a pulse width modulated signal and the span of the frequency range covers both low and high frequencies, then this third measurement method can be considered. Method 3: The inverse period measurement method is suitable for lower frequency measurements while the second measurement method can achieve higher accuracy with higher frequency signals. The larger the period of the known signal used to gate the counting, the smaller the measurement error. The frequency can be calculated by multiplying the count by the frequency of the unknown signal.īy using two counters, you can get more accurate frequency measurement for higher frequencies. In this configuration, the counter will count number of unknown high frequency during a period of known signal. To improve the accuracy of the frequency measurement for higher unknown frequency, we can use this second measurement method, count number of pulses in known time. As the frequency of the signal to be measured increases to approach the frequency of the source frequency, measurement error increases. Method 2: Method 1 w orks well as long as the frequency of the signal to be measured is significantly slower than the known source frequency. This type of measurement is suitable for low frequency measurement. By taking the frequency of the known source and dividing by the count, you can calculate the period of the unknown signal. You can measure the period by counting the rising or falling edges of a known source frequency between the two consecutive rising or falling edges of the unknown frequency. Method 1: The simplest method is period measurement.

Method 3: Time Measurement of a Known Number of cycles The three methods for making frequency measurements are: These VIs demonstrate three different methods for making frequency measurements.