JMIRxMed JMIRx Med JMIRx Med 2563-6316 JMIR Publications Toronto, Canada v3i2e38730 10.2196/38730 Peer-Review Report Peer-Review Report Peer Review of “COVID-19 Return to Sport: NFL Injury Prevalence Analysis” Meinert Edward Anonymous Apr-Jun 2022 22 4 2022 3 2 e38730 13 4 2022 13 4 2022 © . Originally published in JMIRx Med (https://med.jmirx.org), 22.04.2022. 2022

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 https://www.medrxiv.org/content/10.1101/2021.12.16.21267811v1 https://preprints.jmir.org/preprint/35862 https://med.jmirx.org/2022/2/e38755/ https://med.jmirx.org/2022/2/e35862/ COVID-19 sport injury prevalence cause data statistics pain training practice physiology adaptation

This is a peer-review report submitted for the paper “COVID-19 Return to Sport: NFL Injury Prevalence Analysis”

Round 1 General Comments

This paper [1] compares the number of injuries in the National Football League between 3 consecutive years to analyze the impact of the COVID-19 pandemic. Although the paper is investigating an interesting subject, I believe it lacks enough analysis and final conclusion. One important addition to this paper could be an analysis of the differences between the hours of exercise in those 3 years. With the current paper, we do not know if there was actually a decrease in the number of hours each player exercised. This extra analysis will help to understand if the increase in injuries were really resulted from less exercise or if it was because of health issues such as mental and physical problems caused by the pandemic.

 Specific Comments

Please define resistance exercise and postresistance exercise.

Please refrain from citing a figure in the abstract.

Why didn't you include sick days in your analysis?

None declared.

 Puga TB Schafer J Agbedanu PN Treffer K COVID-19 Return to Sport: NFL Injury Prevalence Analysis JMIRx Med 2022 3 2 e35862