Five-position grip strength measures in individuals with clinical depression

Area of Science:

• Neuroscience
• Clinical Psychology

Background:

• 5-position grip strength dynamometry is used to assess sincerity of effort.
• Clinical depression can affect motor skill performance, potentially impacting grip strength test results.
• Misinterpretation of grip strength tests in depressed individuals is a concern.

Purpose of the Study:

• To compare 5-position grip strength testing results between newly diagnosed depressed individuals and a matched control group.
• To investigate potential misinterpretations of grip strength dynamometry in patients with clinical depression.

Main Methods:

• A case-control study involving 45 newly diagnosed depressed patients and 45 matched controls.
• Standardized 5-position grip strength testing was performed on both hands for all participants.
• Statistical analysis (8.5-lb SD cutoff) and clinician review of force plots were used to assess effort.

Main Results:

• 60 of 90 hands in the depressed group showed an SD ≤ 8.5 lb, compared to 1 of 90 in the control group.
• Clinicians perceived "limited effort" in 70% of depressed participants versus 18% of controls.
• Depressed individuals exhibited patterns suggestive of poor volitional effort on grip strength tests.

Conclusions:

• A significant proportion of depressed individuals display grip strength patterns indicative of limited effort.
• Clinicians unaware of depression may misinterpret these findings as lack of sincerity.
• Awareness of clinical depression is crucial for accurate interpretation of grip strength dynamometry.