A headset for voice communication, the headset being configured to be worn at least partly at or in the ear of a user, the headset comprising: - a voice communication unit for enabling a voice communication call mode for establishing a call between the headset and a far-end device; - a speaker for reproduction of audio signals; - a microphone for reception of audio signals; - a photoplethysmograph sensor for optically measuring through the skin of the user in or at the ear of the user; wherein the headset comprises a processing unit connected to the PPG sensor, where the processing unit is configured for determining heart rate data of the user based on the PPG sensor measurements; wherein the processing unit is configured for detecting whether the user is on-call with a far-end device or off-call; and wherein the headset comprises a data communication unit for providing the determined heart rate data of the user, when the user is wearing the headset, for indication of the heart rate data of the user; wherein the processing unit is configured for determining the heart rate and determining beat-to-beat (RRi) intervals based on the PPG sensor measurements, and wherein the processing unit is configured for determining a heart rate variability during a time interval based on the beat-to-beat (RRi) intervals; wherein the processing unit is configured for determining low frequency components and high frequency components based on the heart rate variability, where the low frequency components and the high frequency components are components in a beat-to beat (RRi) periodogram, where the beat-to beat (RRi) periodogram is based on the determined beat-to beat (RRi) intervals; wherein the processing unit is configured for determining a baseline measurement of the low frequency components and the high frequency components during a first time interval T1, when the user is off-call, and wherein the processing unit is configured for measuring a first ratio (LF/HF-off call) between the low frequency components and the high frequency components during the first time interval T1; wherein the processing unit is configured for measuring a second ratio (LF/HF-on call) between the low frequency components and the high frequency components during a second time interval T2, when the user is on-call; and wherein the processing unit is configured to detect stress by detection of the heart rate exceeding a first predefined threshold value (threshold1) and by detection of the second ratio (LF/HF on-call) exceeding a second predefined threshold value (threshold2). the headset comprising: - a voice communication unit for enabling a voice communication call mode for establishing a call between the headset and a far-end device; - a speaker for reproduction of audio signals; - a microphone for reception of audio signals; - a photoplethysmograph sensor for optically measuring through the skin of the user in or at the ear of the user; - a voice communication unit for enabling a voice communication call mode for establishing a call between the headset and a far-end device; - a speaker for reproduction of audio signals; - a microphone for reception of audio signals; - a photoplethysmograph sensor for optically measuring through the skin of the user in or at the ear of the user; wherein the headset comprises a processing unit connected to the PPG sensor, where the processing unit is configured for determining heart rate data of the user based on the PPG sensor measurements; wherein the processing unit is configured for detecting whether the user is on-call with a far-end device or off-call; and wherein the headset comprises a data communication unit for providing the determined heart rate data of the user, when the user is wearing the headset, for indication of the heart rate data of the user; wherein the processing unit is configured for determining the heart rate and determining beat-to-beat (RRi) intervals based on the PPG sensor measurements, and wherein the processing unit is configured for determining a heart rate variability during a time interval based on the beat-to-beat (RRi) intervals; wherein the processing unit is configured for determining low frequency components and high frequency components based on the heart rate variability, where the low frequency components and the high frequency components are components in a beat-to beat (RRi) periodogram, where the beat-to beat (RRi) periodogram is based on the determined beat-to beat (RRi) intervals; wherein the processing unit is configured for determining a baseline measurement of the low frequency components and the high frequency components during a first time interval T1, when the user is off-call, and wherein the processing unit is configured for measuring a first ratio (LF/HF-off call) between the low frequency components and the high frequency components during the first time interval T1; wherein the processing unit is configured for measuring a second ratio (LF/HF-on call) between the low frequency components and the high frequency components during a second time interval T2, when the user is on-call; and wherein the processing unit is configured to detect stress by detection of the heart rate exceeding a first predefined threshold value (threshold1) and by detection of the second ratio (LF/HF on-call) exceeding a second predefined threshold value (threshold2).