Table 2: Heart rate variability (HRV) measurements, heart rate and mean arterial blood pressure (MAP) after exposure to neutral, red or blue light.
|
|
|
neutral light (n=30) |
red light (n=30) |
p |
neutral light (n=30) |
blue light (n=30) |
p |
|
short-term HRV measurements (@ 10min exposure) |
SDNN (ms) |
74,6±38,5 |
109,0±58,0* |
0,001 |
76,4±46,0 |
98,2±53,9* |
0,001 |
|
RMSSD (ms) |
59,8±44,5 |
78,7±56,5* |
0,01 |
55,1±42,9 |
65,0±46,7 |
0,11 |
|
|
pNN50 (%) |
23,2±23,1 |
27,6±21,2 |
0,10 |
22,6±19,7 |
29,0±23,0* |
0,01 |
|
|
LF/HF |
2,7±3,0 |
3,0±2,9 |
0,84 |
1,9±1,7 |
3,8±7,3 |
0,20 |
|
|
SD 1 (ms) |
42,5±31,6 |
55,8±40,1* |
0,01 |
39,1±30,4 |
46,1±33,1 |
0,11 |
|
|
24hrs Holter HRV measurements |
SDNN (ms) |
110,3±45,2 |
127,4±55,2* |
0,001 |
118,0±45,8 |
138,1±59,8* |
0,001 |
|
RMSSD (ms) |
63,3±40,4 |
68,3±39,3* |
0,04 |
72,5±37,5 |
84,2±50,5* |
0,01 |
|
|
pNN50 (%) |
22,1±18,9 |
24,7±18,5* |
0,04 |
25,9±17,0 |
29,8±18,5* |
0,001 |
|
|
SDSD (ms) |
47,9±30,6 |
52,2±31,2* |
0,04 |
56,3±30,5 |
65,3±41,0* |
0,01 |
|
|
heart rate (bpm) |
66,9±24,0 |
59,1±10,9 |
0,10 |
61,7±9,9 |
59,8±10,6 |
0,30 |
|
|
MAP (mmHg) |
98,1±10,1 |
101,6±8,6* |
0,01 |
99,0±11,6 |
103,4±11,4* |
0,01 |
|
values are given as mean ± SD; SDNN: standard deviation of RR-intervals (ms); RMSSD: square root of mean squared difference of successive RR-intervals (ms); pNN50 percentage of heart beats over 50 ms from the baseline (%); LF/HF: ratio of low to high frequency RR-variation calculated by power spectral density analysis; SD1: standard deviation of the scatter away from the 45 degree line in the Pointcaré plot (ms); SDSD: standard deviation of the successive difference between adjacent R-R intervals (ms); MAP: mean arterial blood pressure; * p<0,05 vs. NL.