Correlation between ΔRER and ΔVO
over 100 min of cold exposure. White circles indicate summer data (n = 17), and black squares indicate winter data (n = 17). ΔRER exhibited a significant negative relationship with ΔVO2 in both summer (r = −0.59) and winter (r = −0.69). The red line shows regression lines of ‘summer plots’ and blue line shows ‘winter plots’.