Sports Sciences Commons^™

Association Of Aerobic Performance With Balance, Anaerobic Power, Agility, And Visual Reaction Time In Fencers, Aysel Gökçe Kurt, Manolya Acar

Baltic Journal of Health and Physical Activity

Background: The study aimed to investigate the effects of aerobic performance on balance, anaerobic power, agility, and visual reaction in fencers and was designed as a prospective cohort study. Materials and methods: This study involved 26 fencing athletes (age = 20.35 ± 5.12 years, sports experience: 8.44 ± 4.33 years). The 20-m shuttle test, the vertical jump test, the Y-balance test, the fencing-specific 4-2-2-4 forward-back step method, and the Nelson hand reaction test were used to evaluate aerobic performance, anaerobic performance, balance, agility-change of direction, and visual reaction, respectively. Results: The maximum oxygen consumption determined with a use of the …

The Metabolic Effects Of Carbon-Plated Shoes On D1 Runners, Bingham Hudson, Cole Kimmel, James Schmidt, Adam Macleod

Student Scholar Symposium

Background: This study looks at the metabolic effects of carbon plated shoes compared to non plated shoes in NCAA Division 1 male cross country/track athletes. Carbon-plated shoes, like the Nike Vaporfly 3 (NVF3), have become popular, but it’s important to understand how they impact oxygen use (VO2) and running efficiency.

Methods: Ten NCAA Division 1 male cross-country runners (n = 10) participated in two treadmill tests using indirect calorimetry to measure oxygen consumption. Each runner completed a 1 mile jog warm up followed by appropriate dynamic stretching. Each runner completed a 6-minute run at 10 mph (6:00 per mile) in …

Variations In Flexibility Across Menstrual Cycle Phases In Female College Students, Libby Steinhart, Avery Cox, Allyson Stallworth, Paige Archbold, Bella Vinson

Student Scholar Symposium

Testing flexibility in female college students throughout menstrual cycle; Exercise Science

Comparing Student-Athletes’ Macronutrient Intake To Recommendations For Pre-Workout Fuel, Amelia Valdez, Macy Holloway, Hannah Settle

Student Scholar Symposium

Adequate macronutrient intake of carbohydrates, fats, and protein is essential for sustaining energy, enhancing muscle recovery, and preventing injuries in athletes. Many student-athletes do not have access to a registered dietitian, which often leads them to rely on unverified nutrition sources that recommend habits non-conducive to optimal performance and recovery. Research shows that student-athletes who have access to a dietitian are more likely to meet the pre-workout macronutrient needs recommended by the Sports Nutrition Care Manual (SNCM). This pilot study analyzed the difference between student-athletes’ pre-workout macronutrient consumption and the pre-workout macronutrient intakes recommended by the SNCM before their first …

The Impact Of Exercise On Albuminuria And Kidney Function In The 2nd And 3rd Trimesters Of Physiological Pregnancy, Wojciech Wołyniec, Andrzej Kochanowicz, Jan Mieszkowski, Łukasz Radzimiński, Marcin Renke, Anna Szumilewicz

Baltic Journal of Health and Physical Activity

Background: Physical activity is an important part of healthy lifestyle and should be continued during low-risk pregnancy. Several studies have suggested that most pregnant women had no contraindications to perform exercises. The aim of the study was to assess the acute effect of an exercise test up to refusal and a chronic impact of an 8-week HIIT program on albuminuria and kidney function in the 2nd and 3rd trimester of pregnancy. Material and Methods: A group of 36 pregnant women was studied. At the beginning of the study, all participants had normal kidney function and albuminuria at rest. Nineteen women …

Physical Performance Differences Between Top And First League Female Football Players: Insights From Locomotion Metrics, Mariola Gepfert, Artur Gołaś, Miłosz Drozd, Katarzyna Strońska-Grabień, Piotr Sawicki, Ewelina Lulińska

Baltic Journal of Health and Physical Activity

Background: This study aims to compare locomotion metrics between Poland’s Top League and First League at the team level using 10 Hz GPS. Methods: Team-level match data (autumn round) were analysed. The following metrics were computed: total distance, high-speed running (HSR: 19–23 km·h⁻¹ [5.28–6.39 m·s⁻¹]), sprinting (> 23 km·h⁻¹ [> 6.39 m·s⁻¹]), accelerations and decelerations at two thresholds (> 3.0 and > 4.0 m·s⁻²), and Player Load (arbitrary units, tri-axial accelerometry). Between-league differences were tested with Mann–Whitney U; rank-biserial effect sizes were reported. Results: Top League teams covered more sprint and HSR distance and performed more ACC/DEC at both thresholds (all …

The Effects Of Grounding Techniques On Strength And Power In Division Ii Track And Field Athletes: A Pre/Post Cohort Study, Matthew Ronald Hall

Doctoral Dissertations and Projects

Grounding is the practice of connecting the human body to the Earth’s electrical surface. It has been proposed as a natural intervention capable of reducing inflammation, enhancing recovery, and improving physiological balance. While previous research has identified benefits for general health and recovery, limited evidence exists regarding its effects on athletic performance. This study investigated the effects of grounding interventions on strength and power among Division II track and field athletes. A five-week, pre/post randomized prospective cohort design was employed with thirty participants, stratified for men and women, which included three groups: grounding sheets, grounding pads, control. Athletes were assessed …

Knee Injury Prevention Program In An Early Pubertal Female Athlete During A Recreational Softball Season, Doug W. Dendy, Toby Brooks, C Roger James, Micah Lierly

Topics in Exercise Science and Kinesiology

Topics in Exercise Science and Kinesiology Volume 6: Issue 1, Article 12, 2025. This case study was intended to analyze the impact of a knee injury prevention program (KIPP) for a young female athlete in a short recreational softball season. It was hypothesized that initiating a KIPP early within a recreational sports season would positively alter lower extremity biomechanics, subsequently reducing the risk of knee injuries during and after skeletal development. During a recreational softball season, a 13-year-old female athlete completed a preliminary biomechanical test, the drop vertical jump battery (DVJB_pre), underwent a 7-week in-season KIPP, then was …

The Effects Of Kanpu Masatsu On Sleep Quality And Fatigue Among Older Adults, Aidan Miranda, Yessica Luna Beltran

International Journal of Exercise Science: Conference Proceedings

Sleep quality is crucial for overall health, particularly among older adults. Kanpu Masatsu (KM), a traditional Japanese self-massage technique using dry towels, has been associated with health benefits for this population. PURPOSE: This study explores the effects of performing Kanpu Masatsu before bedtime on sleep quality and fatigue levels. METHODS: Twelve healthy older adults (3 men and 9 women; age 60.67 ± 1.69 years) were recruited to monitor their sleep over 14 days using a Fitbit Sense 2. During the second week, participants performed a whole-body Kanpu Masatsu within 10 minutes before sleep. Sleep quality was assessed via Fitbit’s sleep …

Accuracy Of The Garmin Instinct For Heart Rate Monitoring During Forearm Exercise With And Without Blood Flow Restriction, Danilo Dullas, Clifford Sanders, Yahtziri Martinez, Tevin Perez, Alana Tucker, Amelia Wolfe, Juni Timmins, Catalina M. Kerwin, Kynlee Sperry, Cannon Jones, Heather Zent, Sam Brinkerhoff, Setareh Zarei, Jeff Guzman, Rodolfo I. Mejia, Nathaniel Bodell, James W. Navalta, Merrill Funk, Jeffrey Cowley, Marcus M. Lawrence

International Journal of Exercise Science: Conference Proceedings

Wearable devices are widely used to monitor heart rate (HR) during exercise, but their accuracy under blood flow restriction (BFR) remains uncertain. Because BFR is increasingly applied in rehabilitation and strength training, accurate HR monitoring is essential for both safety and prescription. The PURPOSE of this study was to evaluate the reliability of the Garmin Instinct smartwatch for measuring HR during forearm exercise with and without BFR, compared to a chest-strap criterion device. METHODS: Twenty-three healthy adults (9 females, 14 males; mean age = 24.74 ± 8.19 years) participated in a repeated-measures design. After providing consent and being fitted with …

Validity Of The Polar Verity Sense In Measuring Heart Rate During A Hand Grip Assessment With Blood Flow Restriction, Jeff Guzman, James W. Navalta, Marcus M. Lawrence, Nathaniel Bodell, Jeffrey Cowley, Setareh Zarei, Rodolfo I. Mejia, Catalina M. Kerwin, Kynlee Sperry, Juni Timmins, Cannon Jones, Sam Brinkerhoff, Danilo Dullas, Clifford Sanders, Yahtziri Martinez, Tevin Perez, Alana Tucker, Amelia Wolfe, Merrill Funk

International Journal of Exercise Science: Conference Proceedings

Blood flow restriction (BFR) training has acquired significant attention in rehabilitation and performance sciences. Polar is a popular heart rate (HR) device manufacturer, Polar Electro OY. PURPOSE: The purpose of this study was to investigate the validity of HR from the Polar Verity Sense biceps band vs the Polar H10 chest strap during a hand grip assessment with blood flow restriction. METHODS: Twenty-three adults (9 females, 14 males, Identified otherwise n = 0; age=24.74±8.19 years, height = 172 cm (SD =9) Mass = 79kg (SD= 18.5) were recruited via convenience sampling. Participants were asked to do a warm-up including 5-min …

How Sports Culture Affects Mental Health: United States And Latin America, Isabelle Westling

Saint John’s Preparatory School Student Work

This paper examines how sports culture in the United States of America and in Latin America shapes the mental health and emotional well-being of student-athletes. To answer this question, I read and examined papers and articles originating from both regions. These articles helped me understand cultural implications and shortcomings from both sides. A number of these articles are in Spanish and translated by me throughout my research. My results show that in United States there are a variety of sources of stress. Pressures from school and academics are prevalent as scholarships and future careers are dependent on it. With that, …

Effects Of Ghost Energy Drink On Muscle Strength, Psychomotor Vigilance, And Mood., Jason M. Curtis, Jose J. Rojas, Flavia F. Pereira, Cassandra Evans, Elizabeth Espocito, Alyana Andal Andal, Gavin Poulshock, Hena Thakkar, Taila De Castro, Alexandra Jimenez, Antonio Cristanti, Antonella V. Schwarz, Juan Carlos Santana, Jose Antonio

Journal for Sports Neuroscience

Abstract

Background: This study aimed to evaluate the effects of a commercially available energy drink (Ghost®) compared to a caffeine-matched control on measures of mental and physical performance.

Methods: In a randomized, double-blind design, 62 participants were assigned to receive either the energy drink (Ghost®) or a caffeine-matched control (200 mg caffeine). Assessments were conducted at baseline and approximately 45 minutes post-ingestion, including the Psychomotor Vigilance Test (PVT), CNS Tap Test, handgrip strength, and the Profile of Mood States (POMS).

Results: Participant demographics are presented in Table 1. No significant between-group differences were observed for any performance measures. Both groups …

Upper-Body Post-Activation Performance Enhancement In Mma Athletes: Load-Dependent Effects Across Multiple Explosive Tasks, Jan Strawiński, Dariusz T. Skalski, Magdalena Prończuk, Kinga Łosińska, Ewelina Lulińska, Miłosz Drozd, Maciej Kostrzewa, Adam Maszczyk, Robert K. Roczniok

Baltic Journal of Health and Physical Activity

Background: Post-activation performance enhancement (PAPE) has become a recognized method for acutely improving explosive output, particularly relevant to upper-body performance in combat sports. Objective: This study aimed to evaluate the effects of bench press conditioning activities (CAs) at different intensities (50 %, 65 %, and 80 % 1RM) on upper-body explosive performance in mixed martial arts (MMA) athletes, with emphasis on training status. Methods: Twenty-nine male MMA athletes were divided into intermediate (n = 14) and advanced (n = 15) groups. Each participant completed three CA sessions followed by a 4-minute recovery and then performed a plyometric push-up …

Athletic Participation Among Students And Its Correlation To Increased Outcomes In Academic Performance, Benjamin Carl Anderson

All-Inclusive List of Electronic Theses and Dissertations

This quantitative study investigated the correlation between student participation in athletic-based extracurricular activities and academic performance among high school students in rural Indiana. The research sought to determine whether athletic involvement contributes to academic success indicators such as PSAT and SAT scores, and school attendance. The study looked at how athletics can serve as a lever for improving academic outcomes and supporting students in meeting the criteria for postsecondary readiness. Key research questions explored the influence of gender, ethnicity, grade level, and attendance on academic performance within the subset of students participating in athletics. A review of the literature supported …

Hand Injuries In Boulderers Across Various Settings, Experience And Skill Levels., Cole E. Olinger

Honors Theses

Survey-based research was performed to identify risk factors and prevention tactics for finger injuries in boulderers. An IRB-approved survey was distributed and taken by 228 respondents, whose data was analyzed. Risk factors for finger injury were found to include years of experience and skill level. Results indicated stronger, more experienced boulderers were more likely to report history of finger injury than weaker, less experienced boulderers. Findings suggest boulderers may avoid injury by manipulating their grip type in specific ways.

The Influence Of The Marker Set On Inverse Kinematics Results To Inform Markerless Motion Capture Annotations, Marion Mundt, David Pagnon, Steffi Colyer

Research outputs 2022 to 2026

Markerless motion capture has the potential to enable biomechanical analyses without specialised, high-cost equipment. However, the comparability of many markerless motion capture frameworks with the most used marker-based method is limited. One reason for this is the lack of high-quality, biomechanically-informed datasets that are needed to train markerless models. This study aimed to inform the development of such a dataset by systematically analysing the agreement between a gold-standard marker set and a reduced number of markers to solve inverse kinematics (IK). We analysed the impact of different marker positions on the IK solution using an OpenSim lower body model with …

Hamstring Strength And Architectural Properties Are Associated With Running Biomechanics, Nicholas Ripley, Christopher Bramah, Paul Comfort, John Mcmahon

Research outputs 2022 to 2026

Applied muscular strain and hamstring strain capacity have a joint interaction on hamstring strain injury (HSI) with modifiable risk factors frequently assessed. However, to date there is limited observations on the interaction between these factors. The purpose of the present study was to observe if spatiotemporal characteristics, running kinematics and muscle activation were related to modifiable risk factors of HSI. Twenty-two competitive team sport athletes (24.7 ± 4.3 years, 1.82 ± 0.07 m, 84.9 ± 8.5 kg) participated whereby the Bicep femoris long head (BFLH) fascicle length assessed via ultrasound and isokinetic eccentric hamstring strength was assessed. With running assessment …

Comparison Of Respiratory Responses To Exercise Under Different Heat-Stressful Environments Between Oral Contraceptive And Naturally Menstruating Ovulating Female Athletes, Nanako Hayashi, Toby Mündel, Tze Huan Lei, Claire Badenhorst

Research outputs 2022 to 2026

The present study conducted a secondary analysis of previous data (Lei et al., 2017, 2019) to compare exercise-induced respiratory responses under heat stress between the early follicular (EF)/ quasi -EF and mid-luteal (ML)/ quasi -ML phases in naturally menstruating and oral contraceptive pill (OCP)-using female athletes. Additionally, the study aimed to examine the associations between respiratory responses, thermoregulation, and hormonal profiles within each group. Sixteen endurance-trained female athletes participated: eight with a natural menstrual cycle (NM group) and eight using OCP (OCP group). Each participant completed four trials, comprising fixed-intensity cycling (at 125 and 150 W) followed by a 30-min …

High-Dose Beta-Alanine Supplementation For Two Weeks Did Not Enhance Intermittent Endurance Or Sprint Performance In Trained Futsal Players, Hossein Miraftabi, Erfan Berjisian, Marzieh Nouri Dizicheh, Alireza Naderi, Masoud Bodaghi, Majid S. Koozehchian, Fatemeh Shabkhiz, Alvaro Lopez-Samanes

Research outputs 2022 to 2026

Background: This study aimed to investigate the effects of a high-dose beta-alanine (BA) supplementation on physical performance, blood lactate concentration, and ratings of perceived exertion (RPE) in trained futsal players. Methods: Sixteen trained futsal players participated in a randomized, parallel, double-blind experiment, completing a two-week supplementation period with either 12 g/day of BA (n = 8; age: 19 ± 2 years; height: 1.78 ± 0.03 m; body mass: 68.5 ± 5.4 kg) or a placebo (PLA) (n = 8; age: 18 ± 1 years; height: 1.74 ± 0.08 m; body mass: 65.6 ± 6.4 kg). Athletes completed the futsal intermittent …

Incidence Of Health Problems In Australian Mixed Martial Arts And Muay Thai Competitors: A 14-Month Study Of 26 Combat Sports Events, Colin S. Doherty, Oliver R. Barley, Lauren V. Fortington

Research outputs 2022 to 2026

Background: Mixed martial arts (MMA) and Muay Thai (MT) are widely practiced combat sports, yet research on the full spectrum of competition-related health problems (HPs) remains limited, particularly for MT. Existing studies in both sports primarily focus on retrospective analyses of severe injuries, often estimating time lost from training or competition. This study describes the incidence of all competition HPs reported seven days after MMA and MT contests, and determines the number of days impacted by tracking athletes’ self-identified worst HPs until resolution. Methods: Data on competition HPs were collected using an online questionnaire completed seven days after each MMA …

Proceedings Of The 25th International Symposium On Adapted Physical Activity, Catherine Carty, Gerard Masdeu Yelamos

Publications

This volume presents the Proceedings of the 25th International Symposium of Adapted Physical Activity (ISAPA 2025), hosted by Munster Technological University under the Patronage of UNESCO. It is intended as a permanent scholarly record of the symposium, its themes, and its contributions across research, practice, policy, culture, and inclusion in line with CoARA principles.

Energy Flow Differences In Throwing Arm Joints Between Javelin And Weighted Balls In Male Javelin Throwers, Hans-Peter Köhler, Kristof Kipp, Nikola Prvulović, Maren Witt

Exercise Science Faculty Research and Publications

Introduction: To enhance release velocity during competition, javelin throwers incorporate implements of varying mass into their training regimens. Previous research has demonstrated that, although velocity contributes quadratically to the computation of kinetic energy, heavier implements generate substantially greater kinetic energy at the moment of release, despite markedly lower release velocities. The primary objective of the present investigation was to analyze energy transfer within the throwing arm to gain deeper insight into the biomechanical mechanisms underlying the use of implements with different masses.

Methods: The three-dimensional coordinates of 16 reflective markers were recorded for 6 athletes during throws using 6 different …

Triggering Sarcomerogenesis: Examining Key Stimuli And The Role Attributed To Eccentric Training—Historical, Systematic, And Meta-Analytic Review, Anthony J. Blazevich, Walter Herzog, João Pedro Nunes

Research outputs 2022 to 2026

Background: Serial sarcomere number (SSN) critically influences muscle function and is hypothesized to protect against injury. While most evidence for SSN addition comes from non-human animal studies, eccentric exercise is often proposed as a key stimulus due to its association with increased fascicle length in humans. However, the most efficient exercise stimuli and the effectiveness of eccentric training in increasing SSN remain unclear. The objective of this study was to provide a detailed historical overview of research exploring the mechanical factors regulating muscle/fiber length and its relationship with function, and to explore more recent evidence that eccentric muscle contractions might …

Promises And Perils Of Generative Artificial Intelligence: A Narrative Review Informing Its Ethical And Practical Applications In Clinical Exercise Physiology, Oscar Lederman, Alessandro Llana, James Murray, Robert Stanton, Ritesh Chugh, Darren Haywood, Amanda Burdett, Geoff Warman, Joanne Walker, Nicolas H. Hart

Research outputs 2022 to 2026

Generative Artificial Intelligence (GenAI) is transforming various sectors, including healthcare, offering both promising opportunities and notable risks. The infancy and rapid development of GenAI raises questions regarding its effective, safe, and ethical use by health professionals, including clinical exercise physiologists. This narrative review aims to explore existing interdisciplinary literature and summarise the ethical and practical considerations of integrating GenAI into clinical exercise physiology practice. Specifically, it examines the ‘promises’ of improved exercise programming and healthcare delivery, as well as the ‘perils’ related to data privacy, person-centred care, and equitable access. Recommendations for the responsible integration of GenAI in clinical exercise …

The Effect Of Muscle Warm-Up On Voluntary And Evoked Force-Time Parameters: A Systematic Review And Meta-Analysis With Meta-Regression, Cody J. Wilson, João Pedro Nunes, Anthony J. Blazevich

Research outputs 2022 to 2026

Background: While muscle contractility increases with muscle temperature, there is no consensus on the best warm-up protocol to use before resistance training or sports exercise due to the range of possible warm-up and testing combinations available. Therefore, the objective of the current study was to determine the effects of different warm-up types (active, exercise-based vs. passive) on muscle function tested using different activation methods (voluntary vs. evoked) and performance test criteria (maximum force vs. rate-dependent contractile properties), with consideration of warm-up task specificity (specific vs. non-specific), temperature measurement method (muscle vs. skin), baseline temperatures, and subject-specific variables (training status and …

Eccentric-Only Versus Concentric-Only Isokinetic Strength Training Effects On Maximal Voluntary Eccentric, Concentric And Isometric Contraction Strength: A Systematic Review And Meta-Analysis, Darjan Spudić, Kazunori Nosaka

Research outputs 2022 to 2026

Background: Conflicting results have been reported regarding the effects of resistance exercise training with eccentric (lengthening muscle) versus concentric (shortening muscle) contractions on changes in maximal voluntary contraction (MVC) strength assessed by different contraction modes. Objective: The main objective of this systematic review with meta-analyses was to compare the effectiveness of maximal isokinetic eccentric-only and concentric-only strength training for changes in maximal voluntary eccentric (MVCECC), concentric (MVCCON), and isometric contraction (MVCISO) strength in healthy adults. Methods: We conducted a systematic search in PubMed, SPORTDiscus, and Google Scholar from February to March 2024 for studies that met the following criteria: (1) …

Practical Recommendations On Stretching Exercise: A Delphi Consensus Statement Of International Research Experts, Konstantin Warneke, Ewan Thomas, Anthony J. Blazevich, José Afonso, David G. Behm, Paulo H. Marchetti, Gabriel S. Trajano, Masatoshi Nakamura, Francisco Ayala, Stefano Longo, Nicolas Babault, Sandro R. Freitas, Pablo B. Costa, Andreas Konrad, Antoine Nordez, Arnold Nelson, Astrid Zech, Anthony D. Kay, Olyvia Donti, Jan Wilke

Research outputs 2022 to 2026

Background: Stretching has wide appeal, but there seems to exist some mismatch between its purported applications and what the evidence shows. There is compelling evidence for some stretching applications, but for others, the evidence seems heterogeneous or unsupportive. The discrepancies even affect some systematic reviews, possibly due to heterogeneous eligibility criteria and search strategies. This consensus paper seeks to unify the divergent findings on stretching and its implications for both athletic performance and clinical practices by delivering evidence-based recommendations. Methods: A panel of 20 experts with a blend of practical experience and scholarly knowledge was assembled. The panel meticulously reviewed …

Postinactivity Exercise Training Improves Sarcopenia Traits In 40–60-Year-Old Women Regardless Of Fortified Milk Supplementation, Joanne Trezise, Ricardo M. Lima, Sally D. Poppitt, Aaron C. Fanning, Amanda Devine, Anthony J. Blazevich

Research outputs 2022 to 2026

Background: The term sarcopenia was introduced to describe the age-related decline in muscle mass, but current definitions also include measures of muscle strength and function. Menopause increases sarcopenia risk and may exacerbate the adverse effects of physical inactivity. Exercise training is a potent stimulus to restore muscle health, and nutritional supplementation can further improve the outcomes. The purposes of this study were to examine the changes in a set of sarcopenia-related phenotypes induced by a 14-day step-reduction period followed by a 12-week exercise training programme, with or without fortified milk supplementation in healthy 40–60-year-old females, and to determine whether menopausal …

Live High-Train Low Induced Changes In Hemoglobin Mass And The Erythropoietin-Erythroferrone-Hepcidin Axis In Female Endurance Athletes, Titta Kuorelahti, Johanna K. Ihalainen, Vesa Linnamo, Claire Badenhorst, Oona Kettunen, Ritva Mikkonen

Research outputs 2022 to 2026

The effects of a 21-day live high-train low (LHTL) on hemoglobin mass (Hbmass) and iron demand including the erythropoietin (EPO)-erythroferrone (ERFE)-hepcidin axis and routine iron markers were investigated. Fifteen female endurance athletes completed either 21-day LHTL in normobaric hypoxia (2500 m, ~18 h·day⁻¹) (INT, n = 8) or lived and trained in normoxia (CON, n = 7). Hbmass and resting blood were collected before and after the intervention. An additional blood sample was collected on Day 6 for INT. 21-day LHTL increased Hbmass 3.8% in INT (p < 0.001). EPO increased 35.6% from Day 0 to Day 6 in INT (p = 0.037) and then decreased 42.4% from Day 6 to Day 21 (p = 0.019). In INT, no changes were detected in ERFE or hepcidin, and from the routine iron markers only serum transferrin receptor increased from Day 0 to Day 21 (13.9%, p = 0.013). In CON, no changes were detected in Hbmass or iron markers. In INT, Hbmass and ferritin were positively associated (Day 0 to Day 6, p = 0.005). Thus, hepcidin and ERFE may not provide additional information regarding iron demand following 6- or 21-day LHTL compared to routine iron markers. The relationship between Hbmass and ferritin indicates that adequate ferritin levels are needed during hypoxia to support hematological adaptations.