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the claim

Training twice a day produces greater strength gains than training once daily.

the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 5 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that training twice a day produces greater strength gains than training once daily?

Unclear. The retrieved items compare weekly training frequencies or twice-a-day endurance training, not twice-daily versus once-daily strength training. They partially suggest that higher training frequency is not necessary for strength gains, but none directly tests the claim's specific comparison.

Verdict: PARTIAL LEAN · 0 sources for, 5 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence against · 5
Comparison of once-weekly and twice-weekly strength training in older adults
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Comparison of once-weekly and twice-weekly strength training in older adults. (n.d.). cir.nii.ac.jp. https://doi.org/10.1136/bjsm.2006.029330

2 recorded entries grouped as this source

Additional records of the same source are shown below. They are not counted as additional sources.

Comparison of once‐weekly and twice‐weekly strength training in older adults -
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Comparison of once‐weekly and twice‐weekly strength training in older adults - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1136/bjsm.2006.029330

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More against · 4
Twice-a-day training improves mitochondrial efficiency, but not mitochondrial biogenesis, compared with once-daily training
2019
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Twice-a-day training improves mitochondrial efficiency, but not mitochondrial biogenesis, compared with once-daily training. (2019). hal.science. https://doi.org/10.1152/japplphysiol.00060.2019

Effect of sprint training: Training once daily versus twice every second day
2014
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Ijichi, T., Hasegawa, Y., Morishima, T., Kurihara, T., Hamaoka, T., & Goto, K. (2014). Effect of sprint training: Training once daily versus twice every second day. doi.org. https://doi.org/10.1080/17461391.2014.932849

Skeletal muscle adaptation: training twice every second day vs. training once daily
2005
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Hansen, A. K., Fischer, C. P., Plomgaard, P., Andersen, J. L., Saltin, B., & Pedersen, B. K. (2005). Skeletal muscle adaptation: training twice every second day vs. training once daily. doi.org. https://doi.org/10.1152/japplphysiol.00163.2004

No Time to Lift? Designing Time-Efficient Training Programs for Strength and Hypertrophy: A Narrative Review.
2021
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VM, I., M, N., BJ, S., & MS, F. (2021). No Time to Lift? Designing Time-Efficient Training Programs for Strength and Hypertrophy: A Narrative Review.. doi.org. https://doi.org/10.1007/s40279-021-01490-1

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