An activity information meter is provided which is capable of stable transmission between a measuring device and an output device and is highly convenient. In a measuring device 1 or 101 and an output device 51 or 151, a selector is placed between a current output section and each electrode and between a voltage detection section and at least one electrode and a transmission route is selected as appropriate, thereby making possible bidirectional transmission using a body as a medium, a change in...

A fatigue-degree evaluation device is provided for easily evaluating a degree of fatigue of a living body. Embodiments include a device wherein fluorescent light generated via a liquid excreted from a body is measured; the temperature of the liquid excreted from the body is measured; a pH is calculated based on the fluorescent light and the temperature of the liquid excreted from the body; and a fatigue degree is evaluated based on this pH.

Muscle fatigue measuring equipment is provided by which one can know muscle fatigue status objectively and easily. Embodiments include equipment for performing the steps of substituting a myoelectric value based on a measured myoelectric potential and a stored myoelectric value into an arithmetic expression for determining a myoelectric change; and substituting an extracellular fluid measured using biological impedance and a stored extracellular fluid value into an arithmetic expression for dete...

A stress evaluation apparatus includes an impedance measuring unit for measuring an impedance of a fluid discharged from a living body; a temperature measuring unit for measuring a temperature of the fluid discharged from the living body; a pH calculating unit for calculating a pH value based on the impedance and temperature of the fluid discharged from the living body; and a stress evaluating unit for evaluating a stress based on the pH value calculated by the pH calculating unit.

A muscle fatigue level measuring device is provided which estimates muscle fatigue without being influenced by distances between electrodes. The muscle fatigue level measuring device measures a resistance component and a reactance component in a body part as impedance in the body part by impedance component measuring means 21, measures a muscular tissue effective length in the body part by muscular tissue effective length measuring means 22, computes biologically equivalent model parameters incl...

A living body impedance measurement apparatus is provided which measures a voltage attributed to the impedance of a living body, and separates it into a voltage attributed to a resistance component and a voltage attributed to a reactance component. Then, the voltage attributed to the resistance component, the voltage attributed to the reactance component, and resistance and reactance components of an impedance of an external reference unit are substituted into an impedance calculation formula th...

A phase-sensitivity detector detects a phase sensitivity of an AC signal with a known frequency, output by an input amplifier, and an integrator double-integrates an output of (X-Y) of which the phase sensitivity is detected, thereby obtaining vector detecting information .alpha.(tend-tst)/tm=A cos .theta. and .alpha.(tend-tst)/tm=A sin .theta. of the AC signal with the known frequency.

The apparatus receives a load by a load receiving board, selects and switches a combination of a first sensor and a second sensor, a combination of the second sensor and a third sensor, a combination of the third sensor and a fourth sensor and a combination of the fourth sensor and the first sensor in turn by selection switching means, obtains output differences of all these combinations selected and switched in turn by the selection switching means in output difference conversion means 14, stor...

Disclosed is an apparatus for measuring an activity of autonomic nerve, comprising: a sympathetic nerve activity measuring unit; a parasympathetic nerve activity measuring unit; a memory unit; and an evaluation unit. According to the present invention the sympathetic nerve activity measuring unit measures an activity of the sympathetic nerve and the parasympathetic nerve activity measuring unit measures an activity of the parasympathetic nerve antagonistically functioning with the sympathetic ne...

There is provided an apparatus capable of carrying out an accurate bioelectrical impedance measurement by determining whether contact of a living body with electrodes used at the time of the bioelectrical impedance measurement is normal or not more accurately. The apparatus uses a parameter associated with a phase difference in determining the contact condition of the living body with the electrodes. As the parameter associated with a phase difference, the apparatus uses a value represented by X...