Table 10.
Average ln(LF), ln(HF), and RMSSD values and t-test result subject to each environmental color for different stress groups.
| R Colors | Y Colors | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Classification | Potential Stress | Healthy | p | Classification | Potential Stress | Healthy | p | ||
| R1 (5R 8.6/1.6) |
ln(LF) | 7.41(0.64) | 7.83(0.87) | 0.154 | Y1 (5Y 8.6/1.8) |
ln(LF) | 7.31(0.82) | 8.19(0.71) | 0.007 ** |
| ln(HF) | 6.67(0.65) | 6.65(0.69) | 0.929 | ln(HF) | 6.69(0.67) | 6.67(0.53) | 0.933 | ||
| RMSSD | 34.60(17.44) | 31.96(12.62) | 0.663 | RMSSD | 35.56(13.02) | 33.29(12.90) | 0.655 | ||
| R2 (5R 6.3/1.8) |
ln(LF) | 7.19(0.71) | 7.73(0.58) | 0.045 * | Y2 (5Y 6.3/1.8) |
ln(LF) | 7.37(0.52) | 8.06(0.49) | 0.002 ** |
| ln(HF) | 6.53(0.70) | 6.58(0.51) | 0.838 | ln(HF) | 6.60(0.57) | 6.59(0.50) | 0.969 | ||
| RMSSD | 35.31(14.84) | 30.18(11.49) | 0.335 | RMSSD | 34.86(12.31) | 32.45(10.91) | 0.600 | ||
| R3 (5R 8.6/4.8) |
ln(LF) | 7.37(0.74) | 7.78(0.64) | 0.148 | Y3 (5Y 8.6/4.8) |
ln(LF) | 7.30(0.62) | 7.83(0.54) | 0.029 * |
| ln(HF) | 6.61(0.67) | 6.63(0.73) | 0.966 | ln(HF) | 6.61(0.67) | 6.63(0.51) | 0.96 | ||
| RMSSD | 37.73(22.67) | 29.03(9.57) | 0.226 | RMSSD | 34.82(13.55) | 29.77(9.49) | 0.285 | ||
| R4 (5R 6.3/4.8) |
ln(LF) | 7.39(0.58) | 8.04(0.52) | 0.006 ** | Y4 (5Y 6.3/4.8) |
ln(LF) | 7.47(0.61) | 7.97(0.58) | 0.041 * |
| ln(HF) | 6.53(0.65) | 6.58(0.50) | 0.834 | ln(HF) | 6.54(0.69) | 6.52(0.48) | 0.922 | ||
| RMSSD | 36.03(16.75) | 30.37(11.02) | 0.323 | RMSSD | 36.89(18.65) | 30.39(9.28) | 0.282 | ||
| R5 (5R 8.6/7.8) |
ln(LF) | 7.19(0.50) | 7.94(0.67) | 0.002 ** | Y5 (5Y 8.6/7.8) |
ln(LF) | 7.52(0.41) | 7.78(0.58) | 0.195 |
| ln(HF) | 6.63(0.61) | 6.69(0.66) | 0.793 | ln(HF) | 6.69(0.53) | 6.62(0.65) | 0.76 | ||
| RMSSD | 37.30(13.53) | 32.43(10.78) | 0.320 | RMSSD | 38.13(14.44) | 30.45(10.72) | 0.138 | ||
| R6 (5R 6.3/7.8) |
ln(LF) | 7.61(0.60) | 7.86(0.72) | 0.345 | Y6 (5Y 6.3/7.8) |
ln(LF) | 7.41(0.59) | 8.08(0.72) | 0.015 * |
| ln(HF) | 6.62(0.59) | 6.63(0.59) | 0.983 | ln(HF) | 6.61(0.51) | 6.71(0.60) | 0.66 | ||
| RMSSD | 34.18(10.29) | 29.61(11.20) | 0.280 | RMSSD | 36.89(12.94) | 32.04(10.16) | 0.298 | ||
Notes: ln(LF): log of low frequency heart rate variability; ln(HF): log of high frequency heart rate variability; RMSSD: root mean square of successive RR interval differences; p < 0.01 **, p < 0.05 *.