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Preferred Reporting Items for Resistance Exercise Studies (PRIRES): A Checklist Developed Using an Umbrella Review of Systematic Reviews

Abstract

Background

The issues of replication and scientific transparency have been raised in exercise and sports science research. A potential means to address the replication crisis and enhance research reliability is to improve reporting quality and transparency. This study aims to formulate a reporting checklist as a supplement to the existing reporting guidelines, specifically for resistance exercise studies.

Methods

PubMed (which covers Medline) and Scopus (which covers Medline, EMBASE, Ei Compendex, World Textile Index, Fluidex, Geobase, Biobase, and most journals in Web of Science) were searched for systematic reviews that comprised the primary studies directly comparing different resistance training methods. Basic data on the selected reviews, including on authors, publication years, and objectives, were summarized. The reporting items for the checklist were identified based on the objective of the reviews. Additional items from an existing checklist, namely the Consensus on Exercise Reporting Template, a National Strength and Conditioning Association handbook, and an article from the EQUATOR library were incorporated into the final reporting checklist.

Results

Our database search retrieved 3595 relevant records. After automatic duplicate removal, the titles and abstracts of the remaining 2254 records were screened. The full texts of 137 records were then reviewed, and 88 systematic reviews that met the criteria were included in the umbrella review.

Conclusion

Developed primarily by an umbrella review method, this checklist covers the research questions which have been systematically studied and is expected to improve the reporting completeness of future resistance exercise studies. The PRIRES checklist comprises 26 reporting items (39 subitems) that cover four major topics in resistance exercise intervention: 1) exercise selection, performance, and training parameters, 2) training program and progression, 3) exercise setting, and 4) planned vs actual training. The PRIRES checklist was designed specifically for reporting resistance exercise intervention. It is expected to be used with other reporting guidelines such as Consolidated Standards of Reporting Trials and Standard Protocol Items: Recommendations for Interventional Trials. This article presents only the development process and resulting items of the checklist. An accompanying article detailing the rationale for, the importance of, and examples of each item is being prepared.

Registration

This study is registered with the EQUATOR Network under the title “Preferred Reporting Items for Resistance Exercise Studies (PRIRES).” PROSPERO registration number: CRD42021235259.

Key Points

  • The PRIRES checklist comprises 26 reporting items (39 subitems) that cover four major topics in resistance exercise intervention: 1) exercise selection, performance, and training parameters, 2) training program and progression, 3) exercise setting, and 4) planned vs actual training.

  • The reporting items for the checklist were identified based on the objective of 88 included systematic reviews. Additional items from the Consensus on Exercise Reporting Template (CERT), a National Strength and Conditioning Association (NSCA) handbook, and an article from the EQUATOR library, were incorporated into the final reporting checklist.

  • PRIRES checklist is expected to be used with other reporting guidelines such as Consolidated Standards of Reporting Trials (CONSORT) and Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT).

Introduction

Resistance training is a potent as well as cost-effective non-pharmaceutical intervention for improving muscular and physical function. Research has shown that muscular strength can be improved by up to 50% in healthy older adults after one year of resistance training [1(R3)]. A recent analysis suggested that resistance training provides the best value for money for fall prevention compared to other unimodal and multimodal interventions [2(C)]. However, though generally beneficial, the effectiveness of resistance training is largely determined by parameters such as training intensity and frequency.

Selecting training parameters according to the training purpose is necessary for achieving optimal results. Although organizations such as the National Strength and Conditioning Association (NSCA) have developed some principles for resistance training, e.g., performing ≤ 6 repetitions for maximizing muscle strength gain [3(T15.11)], the influences of many other training parameters, such as optimal time under tension for increasing muscle hypertrophy, require further investigation. However, without complete reporting of the intervention, it is difficult to compare different primary studies and draw conclusions about preferred resistance training methods.

The issues of replication and scientific transparency have been raised in many research fields including psychology [4(T1)], social science [5(Pg638)], and medicine [6,7,8]. Potential means to address the replication crisis and enhance research reliability include trial registration [9(Sec3.2)], publishing the protocol before data collection, the registered reports [9 (Sec. 3.3), 10], a results-free peer review [11, 8, 12], conducting replication studies [4,5,6], and improving transparency [7, 13].

Although the Consolidated Standards of Reporting Trials (CONSORT) [13, 14] and Consensus on Exercise Reporting Template (CERT) [15] have been published to enhance the reporting quality of randomized controlled trials (RCTs) and exercise interventional studies, respectively, a supplementary preferred reporting checklist can further improve the reporting quality of resistance exercise studies. For instance, there were concerns regarding the reported resistance exercise method and program in 7 of the 11 studies summarized in our previous study [16(I3, T1)]. Specifically, of these 7 studies, three failed to report basic items related to resistance exercise, i.e., repetition, intensity, and rest intervals. In addition, some items regarding the resistance exercise such as the rest interval between sets and exercises and the order of exercises, which had been reported in our previous study [16, 13, 14] and CERT [15] checklists. Thus, a supplementary reporting checklist for resistance exercise studies can be beneficial to future research.

To overcome the limitations of the Delphi technique, which has been used to develop existing reporting checklists such as CONSORT [17(M)], an umbrella review was applied in this study. The Delphi technique was first proposed by Norman Dalkey and Olaf Helmer in the 1950s to develop consensus among experts [18(I3)]. Although it can provide some information, it suffers from several methodological disadvantages that can be avoided using the newer umbrella review technique. An umbrella review is a tertiary research design (in contrast to primary research such as RCTs and secondary research such as systematic reviews) [19(Pg5-6)] that emerged at the beginning of the twenty-first century. This design enables systematic data collection and synthesis on a broad issue, which is impractical for a traditional systematic review. The following are several major comparisons between these two research methods that are of consequence to our study. First, expert opinions in the Delphi technique are ranked the lowest in the evidence hierarchy, as opposed to the umbrella review which is considered the highest [19(F2.1)]. Second, concerns have been raised that the Delphi technique is not fully “systematic.” For instance, Humphrey-Murto and de Wit criticized the Delphi method for the ambiguity of its methodology, poor reporting quality, and the presence of little to no empirical evidence to support best practices in the consensus development stages [20(Pg136)]. Third, regarding the advantages of the proposed checklist, as a supplement to CONSORT, it will need to be updated regularly and in timely fasion for it to function optimally. The feasibility of rapidly developing and updating an umbrella review will be an advantage over the time-consuming Delphi technique. A detailed discussion of the pros and cons of the Delphi technique is beyond the scope of this protocol. An integrative introduction to the umbrella review has been edited by Biondi-Zoccai [19]. The limitations of the Delphi technique in methodology, process, results, and conclusion have been reviewed by Vernon [21], and the disadvantages of this technique, including researcher bias and shortcomings, unethical behavior caused by anonymity, and debates over the method rather than the topic, have been discussed by Avella [22].

After the search, we recognized that an article by Coratella [23], also published in Sports Medicine Open, shared a similar purpose to the PRIRES project. However, there were some differences between these two works. Coratella provided a checklist focusing on within-exercise variables [23], instead of a checklist for the entire resistance training program, and provided his valuable insight in a narrative review format. In contrast, we aimed to develop a checklist for the entire resistance training program with an umbrella review method and therefore preregistered this project with both EQUATOR in 2020 and PROSPERO in 2021. We believe that the PRIRES can broade in 2021. We believe that the PRIRES can broaden the scope of Coratella’s checklist. Even if some reporting suggestions might overlap conceptually between PRIRES and the article by Coratella, the methodological processing in generating these recommendations differed substantially.

There are two major differences in research methods between PRIRES and the excellent work by Coratella [23]. First, the research purposes are not the same. Coratella provided his insight and reporting recommendations (8 reporting items) focusing on the “within-exercise” variable, while PRIRES is a project for developing a complete checklist for resistance training interventions including between-exercise variables, training progress, and unconventional training methods (e.g., blood flow restriction).

The second major difference is the methodological approach to constructing the checklist. Although the PRIRES is not free from the authors’ subjective perspective (e.g., item 4c “relative intensity” was retrieved from the NSCA handbook based on our knowledge), a significant amount of effort was made to ensure this checklist was as objective as possible by developing the item extraction protocol, and as inclusive as possible by conducting a systematic search in two databases. The umbrella review and the narrative review are both important research formats and the reporting recommendations derived from these two different methods, even if they are similar conceptually, have their own merits.

This study aims to construct a reporting checklist as a supplement to the existing reporting guidelines such as CONSORT [13, 14], specifically for resistance exercise studies. A preferred reporting items checklist developed using umbrella review methods promises to be more systematic and provides a higher level of evidence than those developed using the Delphi technique. In order to show how the research question developed, the original objective and rationale, which were written before the results were known, are provided in Additional file 1: Original Rationale and Objective.

Methods

This study was reported according to the reporting checklist for umbrella reviews published by Onishi and Furukawa in 2016 [24(T13.1)]; see Additional file 2: Umbrella Review Reporting Checklist.

Inclusion Criteria

  1. 1.

    Systematic reviews that comprised primary studies directly comparing different resistance training methods.

  2. 2.

    Resistance exercise was the primary intervention.

  3. 3.

    There were no limitations on the characteristics of the participants recruited.

Exclusion Criteria

  1. 1.

    Systematic reviews that involved other types of exercise, such as concurrent training (aerobic + resistance exercises), or other interventions (e.g., diet and supplements).

  2. 2.

    Reviews not published in full and/or not published in English.

  3. 3.

    Reviews that included animal studies.

  4. 4.

    Reviews that included studies of resistance training targeting respiratory or oral muscles.

Search Strategies and Information Sources

Systematic reviews that investigate the effects of different resistance exercise parameters, such as the types of resistance exercise and training frequency, were identified by searching PubMed (covers Medline) and Scopus (covers Medline, EMBASE, Compendex, World Textile Index, Fluidex, Geobase, and Biobase [25(T1)] and most journals in Web of Science [26(F2)]) using the following keywords:

“resistance exercise*” or “resistance train*” or “weight exercise*” or “weight train*” or “weight bear*” or “weight-bear*” “weightlift” or “weight lift*” or “strength train*” or “strength exercise*” or “power train*” or “power exercise” or “explosive exercise*” (in Title/Abstract).

AND

Systematic or meta (in Title).

The search syntax is outlined in Additional file 3: Syntax of Literature Search.

Data Selection and Collection Process

The titles and abstracts retrieved from different databases were loaded into Endnote 20 to remove duplicates automatically. The authors TYL and TYC independently screened all titles and abstracts against the selection criteria. The full-text screening was performed if the titles and abstracts indicated that the studies met the criteria or if there was any uncertainty. Multiple reports were checked by searching the first author’s name in Endnote 20 (Clarivate Analytics, Philadelphia, PA, USA) and the registration ID. If multiple reports were found, the most detailed one was included. If disagreements could not be resolved via discussion, the author TMH was consulted.

Reporting Items

Basic data on the included systematic reviews, including authors, publication years, and objectives, were extracted and tabulated. The reporting items were identified based on the objectives of the reviews. Additional information was sought from relevant published guidelines such as the CERT [15] from the EQUATOR library to build this reporting checklist for resistance exercise studies. The quality of the systematic reviews was not judged because this was beyond the scope of this umbrella review.

Results

Our database search retrieved 3,595 relevant records (May 5, 2022). After automatic duplicate removal by EndNote 20, the titles and abstracts of the remaining 2,254 records were manually screened by the authors TYL and TYC independently. One hundred and thirty-seven articles were successfully retrieved and their full texts were screened by TYL. Finally, 88 studies were included in the review; see Fig. 1 for the modified PRISMA 2020 flow diagram.

Fig. 1
figure 1

Modified PRISMA 2020 flowchart. CERT: Consensus on Exercise Reporting Template; NSCA: National Strength and Conditioning Association; PRIRES: Preferred Reporting Items for Resistance Exercise Studies; PRISMA: Preferred Reporting Items for Systematic Reviews and Meta-Analyses

The 49 records excluded after the full-text review and the reasons for their exclusion are listed in Additional file 4: Records Excluded After the Full-Text Review and summarized in Fig. 1. The most common reason for exclusion was that the reviews included studies that did not directly compare different resistance training methods or included non-resistance exercise interventions (n = 44).

Table 1 shows all 26 reporting items (39 subitems) extracted. Twenty items (30 subitems) were identified from the included systematic reviews based on their research objectives (see Additional file 5: Included Reviews and Research Questions); six items (seven subitems) were adapted from the CERT reporting checklist; one subitem was retrieved from an article in the EQUATOR library, which aimed to clearly define a set endpoint in resistance exercise [27(T3)], and one subitem was identified from a National Strength and Conditioning Association (NSCA) handbook [3(T15.17)].

Table 1 Preferred Reporting Items for Resistance Exercise Studies (PRIRES) checklist

Discussion

The Preferred Reporting Items for Resistance Exercise Studies (PRIRES) checklist comprises 26 reporting items that cover four major topics of research on resistance exercise training: 1) exercise selection, performance, and training parameters, 2) training program and progression, 3) exercise setting, and 4) planned vs actual training.

The first section of this reporting checklist, exercise selection, performance, and training parameters, covers the content and flow of a given resistance exercise session. The second section, training program and progression, covers the rules and decisions related to the training progression and to the methods specific to resistance training, such as velocity-based training and periodization. The third section of the checklist, exercise setting, reminds users to report the environment in which the resistance exercise was conducted. Planned vs actual training, the fourth section, points out that researchers should provide information about how well the participants were able to adhere to the intervention plan and about unintended deviations that occurred.

Two subitems of the PRIRES checklist, namely those relating to relative intensity (Item 4c) and set endpoint (Item 5c), were neither identified from the included systematic reviews nor adapted from the CERT checklist. Retrieved from an NSCA handbook [3] (T15.17), Item 4c addresses relative training intensity, which, unlike absolute training intensity, reflects not only the absolute load but also the number of repetitions in a set. Therefore, it can more accurately indicate how difficult a given set is. Item 5c, set endpoint, is adapted from an article by Steele et al. [27]. In this article, they showed the ambiguity in the use and definition of the set endpoint [27(Pg368-370)] and provided recommendations [27(T3)] on how to report it. Both relative intensity and a clearly defined set endpoint are essential measures for comparing resistance exercise studies.

The PRIRES checklist was designed specifically for reporting resistance exercise interventions and is expected to be used with other reporting guidelines. For example, for a resistance training RCT, PRIRES can be used with CONSORT [28] which covers the overall design of a trial, such as the randomization process and masking (i.e., blinding). PRIRES can also be applied to an interventional study protocol and used with the Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) [29]. The editable checklists for both completed studies and protocol are provided in Additional files 6 and 7.

The article published in 2022 by Coratella [23] provided a comprehensive view of how training variables beyond load and number of repetitions influence training stimuli. For instance, Coratella explained that even when the load, number of repetitions, and displacement per repetition are fixed, the differences in muscle length being trained can affect acute as well as long-term results [23 (PP. 4–5)]. Moreover, Coratella also provided in-depth coverage of the influences of manipulations of these training variables on muscle strength and hypertrophy. In the PRIRES checklist, we address the training volume issue by listing the volume-related variables individually instead of labeling a single “training volume” item and consider the examination of the training effect of reporting items as out of scope when developing a checklist. Investigating the training effect of these items in a future umbrella review is expected to be valuable [30].

This article presents the development process and resulting items of the PRIRES checklist but not why each item is critical and relevant. Motivated by the CONSORT 2010 explanation and elaboration [31], we are preparing an accompanying article [32], which will describe the rationale, importance, and examples regarding each item.

In-text citation: This article follows the more precise citation method [33]. In-text citation: I: introduction; M: method; R: results; D: discussion; C: conclusion; the number after abbreviation: paragraph (para.); T: table; F: figure; Sec: section; Pg: page.

Registration

This study is registered with the EQUATOR Network and is available at https://www.equator-network.org/library/reporting-guidelines-under-development/reporting-guidelines-under-development-for-clinical-trials/#PRIRES. The protocol is registered with PROSPERO (CRD42021235259).

Conclusions

The PRIRES checklist was developed primarily via carrying out an umbrella review of systematic reviews and adapting the existing CERT checklist. This development process allowed PRIRES to address the research questions that have been systematically studied. The checklist is expected to improve the reporting completeness of future resistance exercise studies.

Availability of Data and Materials

All available data were presented in this manuscript and supplementary information.

Abbreviations

PRIRES:

Preferred Reporting Items for Resistance Exercise Studies

EQUATOR:

Enhancing the QUAlity and Transparency Of health Research

PROSPERO:

International prospective register of systematic reviews

CERT:

Consensus on Exercise Reporting Template

NSCA:

National Strength and Conditioning Association

CONSORT:

Consolidated Standards of Reporting Trials

SPIRIT:

Standard Protocol Items: Recommendations for Interventional Trials

RCT:

Randomized controlled trial

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Acknowledgements

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Funding

TYL is supported by the Scholarship Program for Elite Doctoral Students [Ministry of Science and Technology (Taiwan)]. The funder played no role in this protocol and did not influence the implementation or publication of this research project.

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TYL (lead author) conceived and designed the protocol of this study and is the guarantor for the study and person responsible for writing initial draft. TYC was responsible for study design and provided suggestions regarding the literature search strategy and the method. TMH was the adviser when there was any disagreement between the first two authors that could not be solved by discussion and was responsible for reviewing the final manuscript. All authors contributed to drafting the protocol and approving the final version.

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Correspondence to Tsung-Min Hung.

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Supplementary Information

Additional file 1

. Original Rationale and Objective.

Additional file 2

. Umbrella Review Reporting Checklist.

Additional file 3

. Syntax of Literature Search.

Additional file 4

. Records Excluded After the Full-Text Review.

Additional file 5

. Included Reviews and Research Questions.

Additional file 6

. Preferred Reporting Items for Resistance Exercise Studies (PRIRES) Checklist for Completed Studies.

Additional file 7

. Preferred Reporting Items for Resistance Exercise Studies (PRIRES) Checklist for Protocols.

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Lin, TY., Chueh, TY. & Hung, TM. Preferred Reporting Items for Resistance Exercise Studies (PRIRES): A Checklist Developed Using an Umbrella Review of Systematic Reviews. Sports Med - Open 9, 114 (2023). https://doi.org/10.1186/s40798-023-00640-1

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