Band Pull-Apart Exercise: Effects of Movement Direction and Hand Position on Shoulder Muscle Activity.
Takumi Fukunaga, Connor Fedge, Timothy Tyler and 5 others
PMID 35391860WHAT IT FOUND
Changing hand position and arm direction alters which shoulder muscles work during band pull-aparts.
Palm-up grip increased infraspinatus activity, while diagonal-up arm movement increased trapezius activity. These findings come from ten healthy men, not patients.
Key findings
01Palm-up hand position elicited significantly higher infraspinatus activity compared to palm-down and neutral positions.
02Diagonal-up movement direction elicited significantly higher upper trapezius, middle trapezius, and lower trapezius activity compared to horizontal and diagonal-down directions.
03Palm-down hand position elicited significantly higher posterior deltoid activity compared to palm-up and neutral positions.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only ten healthy male participants, so results may not generalize to patients with shoulder pain or other demographics. Surface EMG cannot accurately measure the supraspinatus due to overlying muscle tissue. EMG measures electrical activity, not actual force production or long-term training effects. The diagonal-up movement had a higher load due to gravity, which may explain some differences in muscle activity compared to other directions.
Declared interests
The authors report no conflicts of interest.
The easy way to misread this
Do not assume these muscle activation patterns apply directly to patients with shoulder pathology. The study was performed on ten healthy men, and patients with shoulder issues often have altered muscle activation patterns that may not match these findings.