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The Apple Watch 1 had stronger validity than the Fitbit Charge HR for assessing overall EE and steps during aerobic exercise.
Also, the Apple Watch systematically overestimates EE in this group of patients.
Clinical Impact The presented data from this pilot study suggests that caution should be noted before using the Apple Watch 4 wearable wrist monitor to monitor heart rate in patients with cardiac arrhythmias such as atrial fibrillation.
Caution might therefore be warranted when using the Apple Watch for measuring EE.
If confirmed, it might be considered safe to incorporate the Apple Watch in HR-guided training programs in the setting of cardiac rehabilitation.
The Apple Watch™ has good to very good criterion validity for measuring HRmax, with no substantial under- or over-estimation.
The Apple Watch 3 and Fitbit Charge 2 were generally highly accurate across the 24-hour condition.
The performance of the Apple Watch compares favorably to the clinically validated Actiwatch in a normal environment.

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Can excessive smartphone use lead to carpal tunnel syndrome and other repetitive strain injuries?
4 answers
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Self SNAGs (sustained natural apophyseal glides) have shown effectiveness in managing chronic neck pain. Research indicates that SNAGs, when performed with stretching and strengthening exercises, significantly reduce pain, improve function, and increase range of motion in patients with chronic mechanical neck pain. Additionally, SNAGs have been found to be comparable to Mulligan self-mobilization in improving joint position sense, pain levels, and neck disability index in individuals with chronic neck pain. Moreover, SNAGs have demonstrated positive effects on neck function, while biofeedback training has shown benefits in enhancing proprioceptive sensation in patients with neck dysfunction. These findings collectively suggest that self SNAGs can be an effective intervention for managing chronic neck pain, improving function, and enhancing proprioception.
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