Table 3 Correlations between heart rate variability and outdoor temperature before and after lunch
Variables | Before lunch | After lunch | After lunch (30 min) | After lunch (1 h) |
|---|---|---|---|---|
All subjects (n = 55) | ||||
Heart rate | 0.064 (0.642) | 0.047 (0.731) | -0.019 (0.889) | 0.053 (0.701) |
Very low frequency | 0.125 (0.363) | -0.063 (0.647) | 0.064 (0.641) | 0.236 (0.082) |
Low frequency | 0.051 (0.710) | 0.073 (0.594) | 0.117 (0.393) | 0.302 (0.025) |
High frequency | -0.250 (0.066) | -0.134 (0.328) | -0.143 (0.298) | -0.162 (0.236) |
Low-to-high frequency ratio | 0.303 (0.024) | 0.237 (0.081) | 0.230 (0.090) | 0.398 (0.003) |
High BMI group (n = 26) | Before | After | After (30 min) | After (1 h) |
Heart rate | 0.131 (0.525) | 0.103 (0.618) | -0.040 (0.847) | 0.017 (0.819) |
Very low frequency | 0.189 (0.355) | -0.268 (0.186) | 0.056 (0.784) | 0.180 (0.379) |
Low frequency | -0.116 (0.572) | 0.001 (0.999) | 0.247 (0.224) | 0.162 (0.429) |
High frequency | -0.112 (0.587) | -0.137 (0.504) | -0.133 (0.518) | -0.186 (0.362) |
Low-to-high frequency ratio | 0.019 (0.926) | 0.201 (0.324) | 0.381 (0.055) | 0.324 (0.106) |
Low BMI group (n = 29) | Before | After | After (30 min) | After (1 h) |
Heart rate | -0.034 (0.861) | -0.040 (0.837) | -0.057 (0.768) | -0.013 (0.946) |
Very low frequency | 0.080 (0.679) | 0.101 (0.602) | 0.115 (0.553) | 0.302 (0.111) |
Low frequency | 0.167 (0.385) | 0.076 (0.696) | -0.004 (0.982) | 0.466 (0.011) |
High frequency | -0.269 (0.158) | -0.141 (0.466) | -0.135 (0.484) | -0.130 (0.501) |
Low-to-high frequency ratio | 0.495 (0.006) | 0.292 (0.125) | 0.121 (0.533) | 0.478 (0.009) |