TABLE 2.

Main exercise test parameters at +20°C and −20°C

Parameters	+20°C	−20°C	P*
At ischemic threshold†
Exercise time, s	591±109	538±85	0.008
Work, METs	6.1±1.5	5.7±1.1	0.185
Heart rate, beats/min	119±22.5	114±17	0.175
Rate-pressure product, beats/min•mmHg•102	193±47	195±45	0.831
At peak exercise
Exercise time, s	740±93	740±75	0.974
Work, METs	8.0±2.0	8.0±1.8	0.697
Heart rate, beats/min	133±23	135±22	0.239
Rate-pressure product, beats/min•mmHg•102	232±62	242±65	0.231
ST segment depression, mm	2.0±0.5	2.0±0.6	0.759
At 1 min postexercise
Heart rate recovery, beats/min	18.1±3.9	17.4±6.1	0.536

Data presented as mean ± SD.

^*Paired Student’s t test;

^†1 mm ST segment depression. METs Metabolic equivalent units