Relationship between skeletal muscle mass and blood lactate level reduction after short squat jumps in healthy adult non-athletes.
Joya Yui, Satomi Okano, Hitomi Nishizawa
PMID 34658512WHAT IT FOUND
In 15 healthy non-athletic men, more skeletal muscle mass was linked to larger drops in blood lactate after a short squat-jump exercise.
The study shows association, not that building muscle causes faster lactate clearance.
Key findings
01In the analysed group of 15 participants, higher skeletal muscle mass was associated with a larger decrease in blood lactate (r=0.71, p<0.01).
02The rate of lactate decrease was associated with skeletal muscle mass (ρ=0.63, p<0.05).
03Skeletal muscle mass index was associated with both the amount and rate of lactate decrease (r=0.71, p<0.01; ρ=0.59, p<0.05).
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 15 healthy non-athletic males were studied, so it says nothing about patients, women, or people outside this group. It measured association, not change after training, so it cannot show that increasing muscle mass causes faster lactate reduction. It did not examine muscle fatigue using change in physical performance, only blood lactate, heart rate, and perceived exertion. The task was a short squat-jump exercise, so it may not match clinical or sports situations.
Declared interests
The study was supported by a Grant-in-Aid for Scientific Research (19K12862 to H.N.); the authors declared no conflicts of interest.
The easy way to misread this
Do not conclude that building muscle will improve lactate clearance or fatigue recovery in patients. This was a small association study in 15 healthy non-athletic men after a squat-jump task, and it did not test an intervention or patient outcomes.