Comparison of maximum voluntary isometric contraction of the biceps on various posture and respiration conditions for normalization of electromyography data.
Sang-Yeol Lee, Marg-Eun Jo
PMID 27942110WHAT IT FOUND
Expiration after maximal inspiration produced the highest biceps maximum voluntary isometric contraction for EMG normalization in healthy young adults.
Posture also changed values, so standardize posture and breathing when measuring.
Key findings
01The three breathing conditions produced significantly different biceps MVIC values in standing and in supine.
02Expiration after maximal inspiration produced significantly greater biceps MVIC than inspiration after maximal expiration in both postures.
03Expiration and Valsalva MVIC values differed significantly between standing and supine.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
All participants were healthy young adults, so the findings may not apply to patients with pain, weakness, disability, or cardiovascular disease. The study measured only the biceps on the dominant side, not other muscles or the non-dominant side. Valsalva can raise blood pressure and may be difficult to use in people with cardiovascular disease. The outcomes were EMG amplitude values for normalization, not patient function, strength, or treatment effects.
The easy way to misread this
Do not read higher MVIC during expiration as proof that this breathing pattern improves biceps strength or patient function. The study measured EMG values in 22 healthy volunteers, not clinical outcomes.