These findings suggest there are differences in risks for developing musculoskeletal disorders during smartphone use with different key activation mechanisms and different hand sizes.Ĭopyright © 2018 The Authors. Heres what I managed to work out just by ear: Each key has a unique sound The unique sound is made up of two pitches The tone generated is a pure sine wave The tones arent using equal temperament. The differences in thumb flexion were found only in the group with shorter hands and the differences in muscle activity was found only in the group with longer hands. Ive always been interested in phone keypad sounds, so I tried to replicate them. When texting on the touchscreen phone compared to the keypad phone thumb flexion (p = 0.008) and flexion/extension range of motion were smaller (p = 0.02), the thumb was on average less internally rotated (p = 0.02), and activity (50th and 90th percentile) of the thumb and forearm muscles was lower (p ≤ 0.05). The top row consists of 1, 2, and 3, with keys continuing down in order until the last row. The thumb kinematics were tracked using a 3D motion analysis system and muscle activity was registered in six upper limb muscles using surface electromyography in 19 participants. A standard telephone keypad, with four rows of three keys each. Furthermore, the study compared exertion, discomfort, and performance when texting on the two phones. With the shift to a new generation of telephone technology from electromechanical switching to electronics and computer control, a new generation of phones. Download this Free Vector about Telephone keypad, and discover more than 28 Million Professional Graphic Resources on Freepik. Discover 2373 Phone keypad vectors in the Depositphotos collection Premium vector graphics scalable to any size. This study aimed to compare thumb kinematics and upper limb muscle activity, and the influence of hand size, when texting on a keypad smartphone and a touchscreen smartphone.
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