Balloon-based exercise enhances abdominal activation: a comparison between one expert and one novice with chronic low back pain.
Hiraku Nagahori, James Kenyon, Kai-Yu Ho
PMID 41835175WHAT IT FOUND
In a man with 10 years of low back pain, exhaling into a balloon thickened all three abdominal muscles more than a forced breath alone, while the trained instructor showed smaller gains and his transversus abdominis got thinner.
Two people, no proof it works.
Key findings
01In the man with chronic low back pain, exhaling into a balloon raised the contraction ratios of the transversus abdominis, internal oblique and external oblique above what forced expiration alone produced: 0.94 to 1.40, 0.94 to 1.40 and 0.93 to 1.67. At forced expiration alone all three ratios were at or below 1, meaning the muscles were no thicker than at rest.
02In the trained instructor the pattern was different: his transversus abdominis measured thinner with balloon-blowing than with forced expiration alone (contraction ratio 2.68 down to 2.42), while his internal oblique rose from 1.23 to 1.67 and his external oblique from 1.32 to 1.50.
03The instructor's transversus abdominis and internal oblique were thicker than the novice's in every condition, but the novice's external oblique was the thicker of the two at rest and during balloon-blowing (11.24 mm against 8.22 mm with the balloon).
STILL TO COME
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What it does not show
Two men, deliberately chosen to be at opposite ends of the experience range. Age, training and back pain all differ between them at once, so the difference in muscle thickness cannot be traced to balloon-blowing rather than to any of the other differences. The authors say this may have amplified the effects they saw and introduced selection bias. No statistical analysis was possible and none was attempted. The numbers are two people set side by side, and the differences could reflect how hard each man pushed on the day or where the ultrasound probe sat. One session, three images per muscle per condition. The paper says nothing about whether any of these thickness changes persist, or follow a period of training. The paper gives no account of blinding, and does not say whether the order of the three breathing conditions was randomised. The text and the table disagree on one novice value: the text gives a contraction ratio of 0.95 for the external oblique at forced expiration where the table gives 0.93.
Declared interests
The authors declare that the research was conducted with no commercial or financial relationships that could be seen as competing interests. No funder is named.
The easy way to misread this
Do not conclude that balloon-blowing exercises strengthen or build the abdominal muscles. The study compared one trained instructor with one man who had chronic low back pain, so the two differ in age, experience and back pain at the same time, and nothing in the design separates the balloon from those differences. It also measured muscle thickness on one day, not strength, pain or function.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →