Glossary

Resting Heart Rate: This means the number of times your heart beats per minute while you are at rest.; It is generally between 60-80 beats per minute(bpm) for adults, although it can be less than 60 bpm mainly among athletes.; If you don't have a device to measure your heart rate, you can count your pulse at rest and convert it to beats per minute (multiply by 4 for 15 seconds or by 2 for 30 seconds).
WBGT (Wet Bulb Globe Temperature): This is a kind of temperature index that takes into account three elements (temperature, humidity and radiant heat) that significantly affect human heat balance.
Maximum Heart Rate: This is the highest number of beats your heat can pump per minute under high stress.; On this site, it is calculated using "211 - age x 0.64," although some people use the approach of "220 - age."
METs: This is a kind of units for exercise intensity.This expresses how many times more intense the activity is compared with that at rest, assuming that one MET is equivalent to the resting metabolic rate.
Rating of Perceived Exertion (RPE): This is a numerical representation of the perceived exertion during exercise.; A typical example is the Borg Scale devised by Borg, a Swede.; It is expressed in numbers ranging from 6 to 20, while heart rate corresponds to roughly ten times of the number.; There is also a modified version called the New Borg Scale, which sets the resting value at 0 and the maximum value at 10.; As for details, please see the chart hereunder.

Borg Scale		New Borg Scale
20
19	Very, very hard
18		・	Maximal/td>
17	Very hard	10	Very, very strong
16		9
15	Hard	8
14		7	Very strong
13	Somewhat hard	6
12		5	Strong
11	Fairly light	4	Somewhat strong
10		3	Moderate
9	Very light	2	Weak
8		1	Very weak
7	Very, very light	0.5	Very, very weak
6		0	Nothing at all