Glasses (1) with high flexibility of use comprising a system for measuring the user's heart rate, said measuring system comprising a microcontroller (11), at least one heart rate sensor (12), means (13) for generating a visual and / or audible signal correlated with the measured heart rate, and an autonomous power supply (14), said measuring system further comprising adjustable means for placing said at least one sensor (12) against an anatomical area suitable for measuring the heart rate, characterized in that said adjustable means comprise at least one elastically flexible support element (15) for said at least one sensor (12), said support element (15) being supported by a pin (9) of a mount (2) ) of the glasses from the inner side of said pin (9) and being configured to flex towards the inner side of said pin (9) to generate when contact force of the sensor against said anatomical area, contact force that is of an amount at least sufficient to prevent the sensor from moving relative to said anatomical area at least during a heart rate measurement.Gafas (1) con elevada flexibilidad de utilización que comprenden un sistema para medir el ritmo cardiaco del usuario, comprendiendo dicho sistema de medición un microcontrolador (11), al menos un sensor de ritmo cardiaco (12), medios (13) para generar una señal visual y/o audible correlacionada con el ritmo cardiaco medido, y una fuente de alimentación eléctrica autónoma (14), comprendiendo además dicho sistema de medición medios ajustables para colocar dicho al menos un sensor (12) contra un área anatómica adecuada para medir el ritmo cardiaco, caracterizadas porque dichos medios ajustables comprenden al menos un elemento de soporte (15) elásticamente flexible para dicho al menos un sensor (12), estando sostenido dicho elemento de soporte (15) por una patilla (9) de una montura (2) de las gafas desde el lado interior de dicha patilla (9) y estando configurado para flexionarse hacia el lado interior de dicha patilla (9)
