The relation between physical and mental load, and the course of physiological functions and cognitive performance

The data relate to a manuscript that will be published inTheoretical Issues in Ergonomics Science. Taylor & Francis.
Description of variables and research design:
ID=the numerical identification of examined person (EP)
age=19-27
pad_chair: pad=2; chair=1
gender: man=2; female=1
BoCmin=correctly cancelled symbols of Bo test/min or BoC1min...BoC20min
BoCSUMmin=sum of correctly cancelled symbols of Bo test from all 20 minutes
BoCMEANmin=mean of correctly cancelled symbols of Bo test from all 20 minutes
BoEmin=incorrectly cancelled symbols (errors) of Bo test/min or BoE1min...BoE20min
BoESUMmin=sum of incorrectly cancelled symbols (errors) of Bo test from all 20 minutes
BoEMEANmin=mean of incorrectly cancelled symbols (errors) of Bo test from all 20 minutes
VTA=absolute tidal volume change. VTA was subsequently calculated and expressed in liters. 0.5 l is the initial mean value.
VTR=relative tidal volume change
MV=minute ventilation
TEMP=body temperature
SCL=skin conductance level
HRVSampEn=Heart rate variability sample entropy
Pulse_frequency=heart rate (HR)
Resp_frequency=respiratory rate (RR)
HFLF_welch=low frequency to high frequency ratio, computed by Welch
phase_exp=1-4
1: The control phase of the measurement lasted 2 minutes. In this phase, all EPs sat on chairs with no pads. Its purpose was to analyze the initial values of the EPs’ physiological functions. These values were supposed to be identical or very similar in the experimental group and the control group. Minutes 0,1.
2: The following rest phase of the measurement lasted 20 minutes. Control-group EPs continued sitting on chairs without pads, while EPs in the other group were seated on pads that had been added to their chairs. They would then sit on these pads until the end of the fourth phase, the final step in the experiment. During the second phase, EPs were not to show any deliberate cognitive activity. Activities involving inadvertent attention, however, were allowed, for example, looking forward at the table or out of the window. Minutes 2...21.
3: The load phase lasted 20 minutes, during which the EPs continuously filled out of the Bo test (Bourdon test T-78: the test of sustained, selected attention). Minutes 22...41.
4: The verification phase lasted 2 minutes. Following the end of the cognitive load, this phase also served to compare the development of physiological functions in the two groups of EPs in connection with the use of the pad, particularly with respect to exploring the rate of EPs’ adaptation after performance (load). Minutes 42,43.