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A measuring device for use in measuring calorie consumption includes a pulse input unit which detects a first heart rate of the user at a first point in an exercise period and a second heart rate of the user at a second point of the exercise period other than the first point, the pulse input unit no

A measuring device for use in measuring calorie consumption includes a pulse input unit which detects a first heart rate of the user at a first point in an exercise period and a second heart rate of the user at a second point of the exercise period other than the first point, the pulse input unit not detecting a third heart rate between the first and second heart rates; and a controller which receives the detected first and second heart rates and calculates calories consumed using the detected first heart rate, the detected second heart rate, an at rest heart rate of the user, and one or more of an age of the user, gender of the user, weight of the user, height of the user, and an at rest heart rate of the user. The measuring device is usable in a portable device, such as a portable digital audio and/or video reproducing apparatus.

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What is claimed is: 1. A measuring device for use in measuring calories consumed by a user, comprising: a pulse input unit which detects a first heart rate of the user at a first point in an exercise period and a second heart rate of the user at a second point of the exercise period other than the

What is claimed is: 1. A measuring device for use in measuring calories consumed by a user, comprising: a pulse input unit which detects a first heart rate of the user at a first point in an exercise period and a second heart rate of the user at a second point of the exercise period other than the first point, the pulse input unit not detecting a third heart rate between the first and second points; and a controller which receives the detected first and second heart rates and calculates calories consumed using the detected first heart rate, the detected second heart rate, an at rest heart rate of the user, and one or more factors selected from an age of the user, a gender of the user, a weight of the user, a height of the user, and a percent of the body weight attributed to muscle of the user, wherein the controller calculates different calorie consumption rates during the exercise period based upon the detected first and second heart rates. 2. The measuring device of claim 1, wherein the controller calculates: a first calorie consumption component having a first rate of change during a first time period substantially at a beginning of the exercise period and during which time the user's heart rate is changing from the detected first heart rate to the detected second heart rate, and a second calorie consumption component having a second rate of change at a second time period after the first time period and during which time the user's heart rate is substantially the detected second heart rate. 3. The measuring device of claim 2, wherein the first time period is ten percent of the exercise period and the second time period is ninety percent of the exercise period. 4. The measuring device of claim 1, wherein the first point is at a beginning of the exercise period, and the second point is an end of the exercise period. 5. The measuring device of claim 4, wherein the measuring device comprises a hand held portable electrical device. 6. A measuring device for use in measuring calories consumed by a user, comprising: a pulse input unit which detects a first heart rate of the user at a first point in an exercise period and a second heart rate of the user at a second point of the exercise period other than the first point, the pulse input unit not detecting a third heart rate between the first and second points; and a controller which receives the detected first and second heart rates and calculates calories consumed using the detected first heart rate, the detected second heart rate, an at rest heart rate of the user, and one or more factors selected from an age of the user, a gender of the user, a weight of the user, a height of the user, and a percent of the body weight attributed to muscle of the user, wherein: the controller calculates a first calorie consumption rate using the detected first heart rate, and a second calorie consumption rate using the detected second heart rate, and the controller integrates a difference between the calculated first and second calorie consumption rates over a warm up time during which the heart rate is not constant in order to calculate calories consumed during the warm up time of the exercise period. 7. The measuring device of claim 6, wherein the controller calculates a rate of change of the calorie consumption rate during the warm up time to be increasing at a substantially constant rate. 8. The measuring device of claim 7, wherein the controller calculates the rate of change to be substantially a difference between the calculated first and second calorie consumption rates divided by the warm up time. 9. A measuring device for use in measuring calories consumed by a user, comprising: a pulse input unit which detects a first heart rate of the user at a first point in an exercise period and a second heart rate of the user at a second point of the exercise period other than the first point, the pulse input unit not detecting a third heart rate between the first and second points; and a controller which receives the detected first and second heart rates and calculates calories consumed using the detected first heart rate, the detected second heart rate, an at rest heart rate of the user, and one or more factors selected from an age of the user, a gender of the user, a weight of the user, a height of the user, and a percent of the body weight attributed to muscle of the user, wherein: the controller calculates a second calorie consumption rate using the detected second heart rate, the controller calculates a regular calorie consumption rate using an at rest heart rate, the at rest heart rate being a heart rate substantially at a time when the user first awakes from sleep, and the controller integrates a difference between the calculated second and regular calorie consumption rates over a steady portion of the exercise period during which the heart rate is constant and after a warm up time during which the heart rate is not constant. 10. The measuring device of claim 9, wherein a rate of change of the calorie consumption rate during the steady portion is substantially zero. 11. The measuring device of claim 10, wherein the controller further integrates a difference between a first calorie consumption rate and the second calorie consumption rate over the warm up time within the exercise period during which the heart rate is not constant, and the controller calculates the first calorie consumption rate using the detected first heart rate. 12. The measuring device of claim 11, wherein: the controller also integrates a difference between the first calorie consumption rate and the regular calorie consumption rate over the exercise period. 13. The measuring device of claim 12, wherein the warm up time conforms to ten percent of the exercise period and the second point in the exercise period conforms to ninety percent of the exercise period. 14. The measuring device of claim 13, wherein: a regular component is T * Y0, a warm up exercise component is (T/10)*(Y1(2)−Y1(1))*0.5, an exercise component is (9T/10)*(Y1(2)−Y1(1)), Y0=0.01808*(X(1)−A+20.25)+C, Y1(1)=Bm*(X(1)−A)+C+0.3645, Y1(2)=Bm*(X(2)−A)+C+0.3645, X(1) is the detected first heart rate, X(2) is the detected second heart rate, A is the heart rate while the user is at rest, C is a constant relating to a coefficient of basal metabolic rate per minute, T is the exercise period, Bm=0.0109*(LBM/H2)−0.0023*(% FAT)−0.0007*(age)−0.0211, LBM is the percent of body mass attributed to muscle, H is the height, and age is the age of the user. 15. The measuring device of claim 13, wherein: a regular component is T * Y0, a warm up exercise component is (T/10)*(Y1(2)−Y1(1))*0.5, an exercise component is (9T/10)*(Y1(2)−Y1(1)), Y0=0.00895*(X(1)−A+20.25)+C, Y1(1)=Bm*(X(1)−A)+C+0.1812, Y1(2)=Bm*(X(2)−A)+C+0.1812, X(1) is the detected first heart rate, X(2) is the detected second heart rate, A is the heart rate while the user is at rest, C is a constant relating to a coefficient of basal metabolic rate per minute, T is the exercise period, Bf=0.0140(LBM/H2)−0.0012(% FAT)−0.1254, LBM is the percent of body mass attributed to muscle, H is the height, and age is the age of the user. 16. The measuring device of claim 13, further comprising at least one processor including the controller which further reproduces audio and/or video data stored in a memory connected to the measuring device. 17. The measuring device of claim 16, wherein the at least one processor decodes and outputs audio and/or video data encoded in a format selectable between data encoded according to an MPEG standard and a windows media standard. 18. The measuring device of claim 13, further comprising a housing and a battery within the housing which provides power to the at least one processor, wherein the controller is disposed in the housing and the pulse input unit comprises an indentation in the housing sized to receive a finger tip.