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From Fellrnr.com, Running tips
→TRIMPexp Exponental Heart Rate Scaling
Where
* D is the duration in minutes at a particular [[Heart Rate]]
* HR<sub>r</sub> is the [[Heart Rate]] as a fraction of [[Heart Rate Reserve]]* y is the HR<sub>r</sub> multiplied by 1.92 for men and 1.67 for women. These constants were developed based on the experimentally observed relationship between heart rate and lactate level.For men this will give a TRIMP value of 0 to 4.37 per minute and for women 0 to 3.4. ==Worked Example==
A worked example would be a male athlete with a HR<sub>max</sub>=200 and HR<sub>rest</sub>=40 training for 30 min. at 130 BPM. The TRIMP<sub>exp</sub> is therefore
TRIMP<sub>exp</sub> = 30 x (130-40)/(200-40) x 0.64e<sup>(1.92x(130-40)/(200-40))</sup>
