Exercise Science Research Research Articles

Centering the female athlete voice in a sports science research agenda: a modified Delphi survey with Team USA athletes

ObjectivesTo co-construct a sports medicine and exercise science research and translational agenda with Team USA elite female athletes serving as the experts on their health, performance and well-being.Methods40 Team USA...

Sex and gender in sports nutrition research: bridging the gap.

The Olympic Games have grown to be the largest, gender-equal sporting event in the world, and the International Olympic Committee is committed to gender equality in sports encouraging and supporting the promotion of women in sports at all levels and in all structures with a view to implementing the principle of equality of men and women (IOC, 2023). Women competed for the first time at the 1900 Olympic Games in Paris, and the number of women competing has grown exponentially over the last 100 years, so an estimated 5494 female athletes (48 %) competed in the Summer Olympic Games 2021 in Tokyo. Supporting women (alongside men) in achieving optimum performance is crucial, and understanding that there are sex and gender gaps in sports nutrition research is important. One reason for this gap is the historical bias in sports and exercise science research towards male participants. This has led to a poor understanding of the unique physiological and nutritional needs of female athletes. In summary, a balanced approach is crucial to address the nutritional needs of both male and female athletes. Researchers should continue exploring this important area to optimise performance and health for all athletes. The aim of this review is to summarise current sports nutrition literature and highlight research that seeks to understand and address where the gaps are with respect to several key areas in sports nutrition recommendations that can impact advice and practice with both males and females.

Effects of the Menstrual Cycle and Hormonal Contraceptive Use on Metabolic Outcomes, Strength Performance, and Recovery: A Narrative Review.

The effects of female sex hormones on optimal performance have been increasingly recognized as an important consideration in exercise and sport science research. This narrative review explores the findings of studies evaluating the effects of menstrual cycle phase in eumenorrheic women and the use of hormonal contraception (oral contraceptives and hormonal intrauterine devices) on metabolism, muscular strength, and recovery in active females. Ovarian hormones are known to influence metabolism because estrogen is a master regulator of bioenergetics. Importantly, the menstrual cycle may impact protein synthesis, impacting skeletal muscle quality and strength. Studies investigating muscular strength in eumenorrheic women report equivocal findings between the follicular phase and luteal phase with no differences compared to oral contraceptive users. Studies examining recovery measures (using biomarkers, blood lactate, and blood flow) do not report clear or consistent effects of the impact of the menstrual cycle or hormonal contraception use on recovery. Overall, the current literature may be limited by the evaluation of only one menstrual cycle and the use of group means for statistical significance. Hence, to optimize training and performance in females, regardless of hormonal contraception use, there is a need for future research to quantify the intra-individual impact of the menstrual cycle phases and hormonal contraceptive use in active females.

Stronger together: towards constructive conversations about strength differences, gender, and sex

ABSTRACT The differences in strength development processes and maximum strength levels between cisgender men and women – i.e. the ‘strength gap’ – are considerably fraught topics, with significant implications for our broader understandings of sex and gender. The polarization of exercise science and sociocultural research about the relationships between strength, gender, and sex adds further challenges. As a result of their highly diverging conclusions on the strength gap as well as the general absence of communication between the two fields, it becomes nearly impossible to have meaningful discussions that acknowledge the not-just-biological, not-just-cultural complexities of strength development and maximal strength levels. To aid in connecting these seemingly disparate academic fields, this paper engages a biocultural reading of research on the strength training body. By framing the body as the ever-developing result of inextricably intertwined biological and cultural influences, this critical reading outlines the limitations of our current understandings of strength, illuminates areas of complexity and contradiction, demonstrates shared concepts, and suggests possible topics for boundary-crossing inquiry.

“Invisible Sportswomen 2.0”—Digging Deeper Into Gender Bias in Sport and Exercise Science Research: Author Gender, Editorial Board Gender, and Research Quality

Objectives: Women are underrepresented as participants in sport and exercise science research, and most of the research is of low quality. To reduce the gender data gap, it is imperative to understand where this bias originates. The purpose of this study was (a) to evaluate the proportion of first and last author, and editorial board gender, and (b) to explore the association between gender and quality of female-specific research methods. Method: Studies exclusively investigating female participants (2014–2021) were extracted from a larger data set and updated through 2022. First author, last author, and editorial board gender were determined (e.g., from gender pronouns on institutional profiles, Google Scholar, and ResearchGate). Where applicable, study methodology was assessed by giving each study a quality score (0–1) based on key methodological considerations. Descriptive statistics were used to describe author and editorial board gender frequencies. Analyses of variance were used to investigate the associations between gender and female-specific methodological quality. Results: Within 438 female-only studies, data revealed a greater proportion of women first authors (55%) and men last authors (62%). There was an association between women authors (first, last, and both) and higher quality score for female-specific methods across all journals (p = .00–.04). The two lowest-ranked journals for quality score demonstrated worse gender parity within their editorial board (0%–12% women). Conclusions: The results from this study show that most female-only studies were senior authored by men. However, studies led by women had higher quality of female-specific methods. Future research is needed to explore gender distribution of senior academics.

The Ethical Compass: Establishing ethical guidelines for research practices in sports medicine and exercise science

Objective: Research in sports medicine and exercise science has experienced significant growth over recent years. With this expansion, there has been a concomitant rise in ethical challenges specific to these disciplines. While various ethical guidelines exist for numerous scientific fields, a comprehensive set tailored specifically for sports medicine and exercise science is lacking. Aiming to bridge this gap, this paper proposes a comprehensive, updated set of ethical guidelines specifically targeted at researchers in sports medicine and exercise science, providing them with a thorough framework to ensure research integrity. Methods: A collaborative approach was adopted, involving contributions from a diverse group of international experts in the field. A thorough review of existing ethical guidelines was conducted, followed by the identification and detailed examination of 15 specific ethical topics relevant to the discipline. Each topic was discussed in terms of its definition, consequences, and preventive measures. Results: The research in sports medicine and exercise science has grown significantly, bringing to the fore ethical challenges unique to these disciplines. Our comprehensive review identifies 15 key ethical challenges: plagiarism, data falsification, role of artificial intelligence chatbots in academic writing, overstating results, excessive/strategic self-citation, duplicate publications, non-disclosure of conflicts of interest, image manipulation, misuse of peer review, ghost and gift authorship, inadequate data retention, data fabrication, falsification of IRB approvals, lack of informed consent, and unethical human or animal experimentation. For each identified challenge, we propose practical solutions and best practices, enriched by the diverse perspectives of our collaborative international expert panel. This endeavor aims to offer a foundational set of ethical guidelines tailored to the nuanced needs of sports medicine and exercise science, ensuring research integrity and promoting ethical responsibility across these vital fields. Conclusion: This article represents a seminal contribution to the establishment of essential ethical guidelines specifically designed for the fields of sports medicine and exercise science. This article charts a clear course for researchers, clinicians, and policymakers by integrating these ethical principles at the heart of our scholarly and clinical activities. Consequently, it envisions a future where the principles of research integrity and ethical responsibility consistently inform every scientific discovery and every clinical engagement.

How an IJES Working Group Grappled with the Complexities of Three Letters—DEI—With the Goal to Broaden Inclusion and Representation in Exercise Science Research

How an IJES Working Group Grappled with the Complexities of Three Letters—DEI—With the Goal to Broaden Inclusion and Representation in Exercise Science Research

Young Females’ Longitudinal Relationship of Endurance Performance - A Partial Regression Analysis

Coaches and practitioners strive to use methods based on outcome measurements that are evidence-based to maximize female athlete performance, but due to a lack female representation in exercise science research, this is often problematic. The primary goal was to investigate the correlation between maximal oxygen uptake, blood lactate, and running economy in young females. Secondarily, the objective was to observe the longitudinal association between alterations in maximal oxygen uptake, blood lactate, and running economy responses to six weeks of endurance training. Young female athletes (n = 18) were randomized into a weighted vest (n = 10) or non-weighted vest (n = 8) group. Two separate graded treadmill tests for maximal oxygen uptake, blood lactate, and running economy were performed at baseline and post-six weeks of endurance training, which occurred at a frequency of three times per week for six weeks. A slight positive relationship between baseline- maximal oxygen uptake and running economy, r = 0.33, and a moderate positive relationship between baseline- blood lactate and running economy, r = 0.46, were observed. After controlling body composition, a strong positive relationship between post- maximal oxygen uptake and running economy, r = 0.59, and a strong positive relationship between post- blood lactate and running economy, r = 0.85, were observed. This study shows baseline assessments of previously mentioned performance traits may not be related. A weighted vest is considered a safe and alternative ergogenic aid that can be incorporated into an endurance training program. A six-week endurance training program is sufficient time to induce cardiovascular adaptations and improve endurance performance.

Implications for cisgender female underrepresentation, small sample sizes, and misgendering in sport and exercise science research.

A sex-data gap, from testing primarily males, results in a lack of scientific knowledge for other groups (females, transgender individuals). It is unknown whether typical recruitment and participant characterization causes incorrect statistical decisions, and three factors were evaluated: 1) underrepresenting cisgender females, 2) recruiting small sample sizes, 3) misgendering. Data from the National Health and Nutrition Examination Survey (2003-2004) were evaluated for sex differences after removing missing values (N = 3,645; F = 1,763). Disparities were determined by utilizing sample sizes common in sport and exercise science research; mean sample size N = 187, median sample size N = 20. Participants were randomly allocated into datasets in an imbalanced manner (33.5% females, 66.5% males). Potential effects of misgendering were determined at rates of 2% and 5%. Differences between the complete data set and expected decisions were conducted through Chi-squared (χ2) goodness of fit with significance at p < .05. When the entire dataset was evaluated as if a sex testing disparity was present, decisions were not altered (χ2 = .52, p = .47). Differences were observed for mean sample size (χ2 = 4.89, p = .027), median sample size (χ2 = 13.52, p < .001), and misgendering at 2% (χ2 = 13.52, p = < .001) and 5% (χ2 = 13.52, p = < .001). Recruitment practices in sport and exercise science research should be revisited, as testing primarily cisgender males has consequences, particularly in small sample sizes. Misgendering participants also has consequences on ultimate decisions and interpretations of data, regardless of sample size. Inclusiveness is needed in helping all individuals feel valued and respected when participating in sport and exercise science research.

Underrepresentation Of Women Participants In Exercise Science And Physiology Research Is Associated With Authorship

Underrepresentation Of Women Participants In Exercise Science And Physiology Research Is Associated With Authorship

Underrepresentation of women in exercise science and physiology research is associated with authorship gender.

Historically, low representation of women participants in exercise science and physiology studies has led to a lack of understanding in the response of women to exercise and therapeutic interventions. We hypothesized that 1) the number of women authors, participants, and editorial board members increased over 30 years (1991-2021) and 2) larger representation of women as editors and authors is associated with more women participants. Gender (man/woman) of editorial board members (n = 394), authors (n = 5,735), and participants (n = 2,984,883) of 972 original research articles with human participants published in 1991 and 2021 was analyzed from three journals: Journal of Applied Physiology, Medicine and Science in Sports and Exercise, and British Journal of Sports Medicine. Between 1991 to 2021, the average percent women per article as participants (21.9 ± 31.7% vs. 36.3 ± 30.3%, respectively, P < 0.001), authors (16.4 ± 22.4% vs. 30.9 ± 24.0%, P < 0.001), and editorial board members (13.3 ± 5.4% vs. 41.5 ± 7.3%, P = 0.006) increased. In 2021, the gender proportion of participants in large datasets was similar (50.2 ± 20.2% women). However, studies with smaller datasets (i.e., <∼3,000 participants) included less women (35.6 ± 30.6%). Women participants (%) were less when the last author was a man rather than a woman in 1991 (19.9 ± 29.5% vs. 34.3 ± 42.2%) and 2021 (31.6 ± 27.7% vs. 51.7 ± 33.4%). In 2021, there was a positive correlation between author and participant gender (% women) (r = 0.42, P < 0.001). Our data suggest that the low representation of women in exercise science and physiology research could be resolved with equitable numbers of women authors and editors and by encouraging men authors to study both women and men participants.NEW & NOTEWORTHY Analysis of human applied physiology studies revealed that the representation of women authors, participants, and editorial board members increased over 30 years but remained lower than men in 2021. Larger representation of women editors and authors was associated with more women participants. Women authors assessed similar numbers of women and men participants, whereas men authors included less women. Equitable representation of women participants may be achieved by closing the gender gap in authorship and editorial board membership.

Neuromuscular electrical stimulation during maximal voluntary contraction: a Delphi survey with expert consensus

PurposeThe use of electrical stimulation to assess voluntary activation of muscle/s is a popular method employed in numerous exercise science and health research settings. This Delphi study aimed to collate expert opinion and provide recommendations for best practice when using electrical stimulation during maximal voluntary contractions.MethodsA two-round Delphi study was undertaken with 30 experts who completed a 62-item questionnaire (Round 1) comprising of open- and closed-ended questions. Consensus was assumed if ≥ 70% of experts selected the same response; such questions were removed from the subsequent Round 2 questionnaire. Responses were also removed if they failed to meet a 15% threshold. Open-ended questions were analysed and converted into closed-ended questions for Round 2. It was assumed there was no clear consensus if a question failed to achieve a ≥ 70% response in Round 2.ResultsA total of 16 out of 62 (25.8%) items reached consensus. Experts agreed that electrical stimulation provides a valid assessment of voluntary activation in specific circumstances, such as during maximal contraction, and this stimulation can be applied at either the muscle or the nerve. Experts recommended using doublet stimuli, self-adhesive electrodes, a familiarisation session, real-time visual or verbal feedback during the contraction, a minimum current increase of + 20% to ensure supramaximal stimulation, and manually triggering stimuli.ConclusionThe results of this Delphi consensus study can help researchers make informed decisions when considering technical parameters when designing studies involving electrical stimulation for the assessment of voluntary activation.

Men and women differ in their interest and willingness to participate in exercise and sports science research.

Unequal proportions of male and female participants in exercise research might be attributed, in part, to differences in interest and willingness to participate. We tested if men and women are equally interested and willing to undergo exercise research procedures and if they consider different factors when deciding to participate. Two samples completed an online survey. Sample 1 (129 men, 227 women) responded to advertisements on social media and survey-sharing websites. Sample 2 (155 men, 504 women) was comprised of undergraduate psychology students. In both samples, men were significantly more interested to learn their muscle mass amount, running speed, jump height, and ball throwing ability, and more willing to receive electrical shocks, cycle or run until exhaustion, complete strength training that causes muscle soreness, and take muscle-building supplements (all p ≤ 0.013, d = 0.23-0.48). Women were significantly more interested to learn their flexibility, and more willing to complete surveys, participate in stretching and group aerobics interventions, and participate in home exercise with online instruction (all p ≤ 0.021, d = 0.12-0.71). Women rated the following significantly more important when deciding to participate: study's implications for society; personal health status; confidence in own abilities; potential anxiety during testing; type of research facility; time to complete study; and invasiveness, pain/discomfort, and possible side effects of procedures (all p < 0.05, d = 0.26-0.81). Differences in interest and willingness to participate in research probably contribute to different proportions of men and women as participants in exercise research. Knowledge of these differences might help researchers develop recruitment strategies aimed at encouraging both men and women to participate in exercise studies.

Underrepresentation of Women Participants in Exercise Science and Physiology Research is Associated with Authorship: A Historical Perspective

The historically low representation of women as participants in exercise science and physiology research has led to a lack of understanding in the response of women to exercise and other therapeutic interventions. We hypothesize (1) the number of women authors and participants will increase over the last 30 years, and (2) a larger representation of women authors will be associated with an increase in the number of women participants. METHODS: Original research articles (n = 971) were analyzed from three journals (Journal of Applied Physiology, Medicine and Science in Sports and Exercise, and British Journal of Sports Medicine) in 1991 and 2021. These journals were chosen based on the following inclusion criteria: consistently ranked in the top 15 exercise science and physiology research journals, impact factor &gt;3.5, ≥50 years of publications, and were accessible online. Articles were chosen from the following inclusion criteria: original research and not a review, included humans and not animals and did not solely use computational models. ANOVA and modified Pearson-Filon (ZPF) were used to statistically analyze the data. Data are reported as mean ± standard deviation. RESULTS: The number (percentage) of women authors was less in 1991 than 2021 (16 ± 22% vs. 31 ± 24%, p &lt; 0.001) as well as the number of women participants (22 ± 32% vs. 36 ± 30%, p &lt; 0.001). The percentage of women participants were less when the last author was a man compared to when the last author was a woman in 1991 (20 ± 30% vs. 34 ± 42%, p = 0.002) and in 2021 (32 ± 28% vs. 52 ± 33%, p &lt; 0.001). Of all studies, 51% were authored by men only in 1991, which declined to 18% in 2021. In contrast, 1.8% in 1991 and 1.1% in 2021 were authored by women only. The correlation between authorship gender (number of women/total authors ratio) and participant gender (number of women/total participants ratio) grew between 1991 and 2021 (r = 0.27 vs. r = 0.42, p = 0.020). CONCLUSION: While the number of women authors and participants increased from 1991 to 2021, these numbers do not represent the current number of women in the population (~51%). Our data shows the historical underrepresentation of woman authors influences the low number of woman participants. Specifically, women authors included participants of both genders (men and women) at equitable numbers in exercise science and physiology research in 2021. The low representation of women as participants in exercise science and physiology research could be resolved by encouraging authors who are men to research equitable numbers of each gender. This is the full abstract presented at the American Physiology Summit 2023 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Mass Sportrometry: An annual look back at applications of mass spectrometry in sport and exercise science.

Research in sport and exercise science (SES) is reliant on robust analyses of biomarker measurements to assist with the interpretation of physiological outcomes. Mass spectrometry (MS) is an analytical approach capable of highly sensitive, specific, precise, and accurate analyses of a range of biomolecules, many of which are of interest in SES including, but not limited to, endogenous metabolites, exogenously administered compounds (e.g. supplements), mineral ions, and circulating/tissue proteins. This annual review provides a summary of the applications of MS across studies investigating aspects related to sport or exercise in manuscripts published, or currently in press, in 2022. In total, 93 publications are included and categorized according to their methodologies including targeted analyses, metabolomics, lipidomics, proteomics, and isotope ratio/elemental MS. The advantageous analytical opportunities afforded by MS technologies are discussed across a selection of relevant articles. In addition, considerations for the future of MS in SES, including the need to improve the reporting of assay characteristics and validation data, are discussed, alongside the recommendation for selected current methods to be superseded by MS-based approaches where appropriate. The review identifies that a targeted, mostly quantitative, approach is the most commonly applied MS approach within SES, although there has also been a keen interest in the use of 'omics' to perform hypothesis-generating research studies. Nonetheless, MS is not commonplace in SES at this time, but its use to expand, and possibly improve, the analytical options should be continually considered to exploit the benefits of analytical chemistry in exercise/sports-based research. Overall, it is exciting to see the gradually increasing adoption of MS in SES and it is expected that the number, and quality, of MS-based assays in SES will increase over time, with the potential for 2023 to further establish this technique within the field.

Current evidence shows no influence of women's menstrual cycle phase on acute strength performance or adaptations to resistance exercise training.

The bias towards excluding women from exercise science research is often due to the assumption that cyclical fluctuations in reproductive hormones influence resistance exercise performance and exercise-induced adaptations. Hence, the purpose of this umbrella review was to examine and critically evaluate the evidence from meta-analyses and systematic reviews on the influence of menstrual cycle phase on acute performance and chronic adaptations to resistance exercise training (RET). We observed highly variable findings among the published reviews on the ostensible effects of female sex hormones on relevant RET-induced outcomes, including strength, exercise performance, and hypertrophy. We highlight the importance of comprehensive menstrual cycle verification methods, as we noted a pattern of poor and inconsistent methodological practices in the literature. In our opinion, it is premature to conclude that short-term fluctuations in reproductive hormones appreciably influence acute exercise performance or longer-term strength or hypertrophic adaptations to RET.

Protocol for a cluster randomized clinical trial of a mastery-climate motor skills intervention, Children's Health Activity and Motor Program (CHAMP), on self-regulation in preschoolers.

Self-regulation (SR) is critical to healthy development in children, and intervention approaches (i.e., professional training, classroom-based curricula, parent-focused intervention) have shown to support or enhance SR. However, to our knowledge, none have tested whether changes in children's SR across an intervention relate to changes in children's health behavior and outcomes. This study, the Promoting Activity and Trajectories of Health (PATH) for Children-SR Study uses a cluster-randomized control trial to examine the immediate effects of a mastery-climate motor skills intervention on SR. Secondly, this study examines the associations between changes in SR and changes in children's health behaviors (i.e., motor competence, physical activity, and perceived competence) and outcomes (i.e., body mass index and waist circumference) (ClinicalTrials.gov Identifier, NCT03189862). The PATH-SR study will be a cluster-randomized clinical trial. A total of 120 children between the ages of 3.5 to 5 years of age will be randomized to a mastery-climate motor skills intervention (n = 70) or control (n = 50) condition. SR will be assessed using measures that evaluate cognitive SR (cognitive flexibility and working memory), behavioral SR (behavioral inhibition), and emotional SR (emotional regulation). Health behaviors will be assessed with motor skills, physical activity, and perceived competence (motor and physical) and health outcomes will be waist circumference and body mass index. SR, health behaviors, and health outcomes will be assessed before and after the intervention (pre-test and post-test). Given the randomization design, 70 children in the intervention group and 50 in the control group, we have 80% power to detect an effect size of 0.52, at a Type I error level of 0.05. With the data collected, we will test the intervention effect on SR with a two-sample t-test comparing the intervention group and the control group. We will further evaluate the associations between changes in SR and changes in children's health behaviors and health outcomes, using mixed effect regression models, with a random effect to account for within-subject correlations. The PATH-SR study addresses gaps in pediatric exercise science and child development research. Findings hold the potential to help shape public health and educational policies and interventions that support healthy development during the early years. Ethical approval for this study was obtained through the Health Sciences and Behavioral Sciences Institutional Review Board, University of Michigan (HUM00133319). The PATH-SR study is funded by the National Institutes of Health Common Fund. Findings will be disseminated via print, online media, dissemination events and practitioner and/or research journals. ClinicalTrials.gov Identifier, NCT03189862.

Measurement in Physical Education and Exercise Science (MPEES): A Summary of MPEES-Related Activities in 2022

ABSTRACT Purpose The purpose of this manuscript is to provide a summary of Measurement in Physical Education and Exercise Science (MPEES)-related activities in 2022. Manuscripts submitted In 2022, original submissions (i.e., not counting revised manuscripts) decreased by ~21% as compared to 2021 when the number of original submissions was 464. However, the number of original submissions in 2022, 367, represented an increase of ~36% when compared to the average (~269) over the previous 5 years (2017–2021). Forty-nine countries were represented across the 367 original manuscripts submitted to MPEES in 2022. MPEES continues to welcome high-quality submissions from around the world in 2023. Manuscripts submitted by section The seven sections of MPEES are (1) exercise science, (2) physical activity, (3) physical education pedagogy, (4) psychology, (5) research methodology and statistics, (6) sport management and administration, and (7) tutorial and teacher’s toolbox. The vast majority of manuscripts submitted to MPEES in 2022 were submitted to one of the four sections: exercise science or physical activity or research methodology and statistics or psychology. MPEES continues to welcome high-quality submissions within each of the seven sections that comprise the journal in 2023. Review process Almost all the original manuscripts submitted to MPEES in 2022 received an initial decision by February 15, 2023 (i.e., 364 of the 367 manuscripts received). When an immediate decision (e.g., desk-rejection) was rendered by the editor-in-chief, it always (i.e., for 303 of 303 manuscripts) occurred within 10 days of receiving the manuscript. When a manuscript was assigned to a section editor by the editor-in-chief, it typically (i.e., for 57 of 61 manuscripts) received an initial decision within 90 days of receiving the manuscript. Nineteen countries were represented across reviewers for the original manuscripts sent out for external review by MPEES in 2022. We gratefully acknowledge, and list in the Appendix, the many scholars (N = 114) from around the world who served as a reviewer for MPEES in 2022. Manuscripts published Volume 26 (i.e., the volume published in 2022) of MPEES published a total of 33 manuscripts. More than three-fourths of the published manuscripts were submitted to one of the three sections: exercise science or physical activity or research methodology and statistics. MPEES continues to strive for publishing high-quality manuscripts within each of the seven sections that comprise the journal in 2023. Sixteen countries were represented across the manuscripts published in Volume 26 of MPEES. MPEES continues to strive for publishing high-quality manuscripts written by one or more authors from around the world in 2023. Impact factor The 2021 impact factor for MPEES was 1.98 representing a decrease of ~14% compared to 2020 when the journal’s impact factor was 2.30. However, the 2021 impact factor for MPEES represented an increase of ~16% when compared to 2019 impact factor for MPEES (i.e., the first year MPEES received an impact factor). The value of the 2021 impact factor placed MPEES in the third quartile (i.e., ranked #173 out of 270 journals) within the Education & Educational Research category of Clarivate Analytics. The 2022 impact factor for MPEES is expected to be released in ~June 2023.

Ethical Standards in Sport and Exercise Science Research: 2022 Update

Key words ethics - codes of ethics - ethics committees - research

Sex differences in the impact of resistance exercise load on muscle damage: A protocol for a randomised parallel group trial

IntroductionResistance training can induce skeletal muscle hypertrophy and strength gains, but is also associated with acute muscle damage, characterised by muscle soreness, impaired muscle function, and structural damage to muscle cell membranes and its components. These consequences can be detrimental to future exercise performance and dampen long-term training adaptations. Previous research has considered resistance exercise intensity as a factor in exercise-induced muscle damage (EIMD), though a clear direction of the findings has not yet been established. Further, female populations are heavily underrepresented in this field of study. Therefore, we here propose a study protocol designed to examine sex differences in the muscle damage response to resistance exercise performed with low or high loads in a population of untrained, young adults.MethodsThis study will employ a randomised parallel group design. Twenty-four males and 24 females will perform an acute leg-based resistance exercise session at either 30% (low-load) or 80% (high-load) of their pre-determined one-repetition maximum (1RM). Maximal leg strength will be determined by a 1RM test 3 wk before and 72 and 168 h after the exercise bout. Additionally, muscle damage will be assessed immediately before the exercise bout and immediately, 24, 48, 72, and 168 h after the exercise bout through measures of muscle soreness, limb circumference, range of motion, and serum concentrations of creatine kinase and interleukin-6. The outcomes of this trial could inform sex-specific resistance training recommendations and help bridge the sex data gap in sport and exercise science research.