The more the biceps stretched during the first workout, the more 'swelling' showed up on the ultrasound scan afterward.

Scientific Claim

The increase in distal biceps brachii myotendinous junction displacement from set 1 to set 10 during the first eccentric bout is significantly correlated with the magnitude of increase in ultrasound echo intensity.

Original Statement

“A significant correlation was found between the percent change in distal MTJ displacement from set 1 to set 10 during the first exercise bout and the magnitude of change in peak ultrasound echo intensity...”

From study:Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated-bout effect.

Evidence Quality Assessment

Claim Status

appropriately stated

Study Design Support

Design supports claim

Appropriate Language Strength

association

Can only show association/correlation

Assessment Explanation

The claim accurately reflects the reported Pearson correlation without implying causation. The verb 'correlated' is appropriate for observational data.

Evidence from Studies

Supporting (0)

No supporting evidence found

Contradicting (1)

Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated-bout effect.

Randomized Controlled Trial

Human

2015 May 15

The study looked at how much the biceps muscle stretched and how much it got damaged during exercise, but it never checked if more stretching meant more damage — so we can’t say the two are linked.

Source Study

Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated-bout effect.

Score: 37

DOI: 10.1152/ajpregu.00338.2014

Similar Assertions

The second time people do a tough arm workout, their muscles show less 'swelling' on ultrasound scans, meaning there's probably less damage or inflammation.

82%

When you do bicep curls with your shoulder stretched back, the lower part of your bicep shows more signs of stress on ultrasound right after the workout than when you keep your shoulder neutral.

78%

The more the biceps stretched during the first tough workout, the more strength the person lost the next day.

77%

The middle part of your bicep gets a little more 'hazy' on ultrasound after a workout, but it clears up by the next day — and it doesn’t matter if you changed your shoulder angle.

74%