Texas Tech University

Grant M. Tinsley, Ph.D.

Dr. Grant Tinsley

Researcher: Grant M. Tinsley, Ph.D.

Title: Associate Professor

Laboratory: Energy Balance & Body Composition Laboratory (Room 114)






Dr. Tinsley is the Director of the Energy Balance & Body Composition Laboratory in the Department of Kinesiology & Sport Management at Texas Tech University. The major research interests of his lab group are the critical evaluation of body composition assessment techniques,  sports nutrition strategies to improve performance and body composition, and the influence of intermittent fasting on health and physical performance.

Energy Balance & Body Composition Laboratory

Current Projects

  • Digital Anthropometry and Body Composition Estimation Using a Generation 2 Prototype 3-Dimensional Optical Scanner (2022 - 2023). Funded by Prism Labs.
  • Chronic Thermogenic Dietary Supplement Consumption: Effects on Body Composition, Anthropometrics, Metabolism, and Subjective Variables (2022 - 2023). Funded by EHP Labs.

Past Projects

  • Evaluation of Novel Beverage Formulations for Hydration Enhancement in Humans (2020 - 2022). Funded by 8 POiNT, LLC.
    • Manuscript under review.
  • Quantifying the Relationship Between Anthropometry, Body Composition, and Performance on the Army Combat Fitness Test (2021 - 2022). Funded by the Texas chapter of the American College of Sports Medicine.
    • Manuscripts in preparation. 
  • Metabolic Effects of a Novel Ready-to-drink Thermogenic Beverage (2021 - 2022). Funded by EHP Labs.
    • Manuscript accepted.
  • The Effect of Breakfast Consumption on Afternoon Resistance Training Performance (2021 - 2022).
    • Manuscript in preparation.
  • Validity and Reliability of Commercially Available Bioelectrical Impedance Analysis Devices (2021 - 2022). 
    • Assessing the Reliability and Cross-Sectional and Longitudinal Validity of 15 Bioelectrical Impedance Analysis Devices. Link to article.
  • Pharmacokinetic Analysis of Nutrient Absorption from a Novel Liposomal Multivitamin/mineral Formulation (2021 - 2022). Funded by Nutraceutical International Corporation.
    • Liposomal Mineral Absorption: A Randomized Crossover Trial. Link to article.
  • Influence of Caffeinated and Non-caffeinated Pre-workout Supplements on Resistance Exercise Performance (2021). Funded by Legion Athletics, Inc.
    • The influence of caffeinated and non-caffeinated multi-ingredient pre-workout supplements on resistance exercise performance and subjective outcomes. Link to article
  • Reliability of Body Composition Assessment Methods (2020). 
    • Manuscript in preparation.
  • Adaptations to Overfeeding Plus Resistance Training (2019)
    • Tracking changes in body composition: comparison of methods and influence of pre-assessment standardisation. Link to article.
    • Predicting Adaptations to Resistance Training Plus Overfeeding Using Bayesian Regression: A Preliminary Investigation. Link to article.
    • Comparison of Indirect Calorimetry and Common Prediction Equations for Evaluating Changes in Resting Metabolic Rate Induced by Resistance Training and a Hypercaloric Diet. Link to article.
    • A Field-based Three-Compartment Model Derived from Ultrasonography and Bioimpedance for Estimating Body Composition Changes. Link to article.
    • Longitudinal agreement of four bioimpedance analyzers for detecting changes in raw bioimpedance during purposeful weight gain with resistance training. Link to article.
  • Influence of a Commercial Energy Drink on Metabolism and Exercise Performance (2019-2020). Funded by Vital Pharmaceuticals, Inc.
    • Effects of Bang® Keto Coffee Energy Drink on Metabolism and Exercise Performance in Resistance-Trained Adults: A Randomized, Double-blind, Placebo-controlled, Crossover Study. Link to article.
  • Influence of Acute Water Ingestion and Prolonged Standing on Raw Bioimpedance and Subsequent Body Fluid and Composition Estimates. Supported by BioSpace, Inc. (DBA InBody). 
    • Influence of Acute Water Ingestion and Prolonged Standing on Raw Bioimpedance and Subsequent Body Fluid and Composition Estimates. Link to article.
  • Critical Evaluation of Body Composition Assessment Methods (2018-2019). Supported by SizeStream, LLC and Naked Labs, LLC.
    • 3-Dimensional optical scanning for body composition assessment: A 4-component model comparison of four commercially available scanners. Link to article.
    • Five-component model validation of reference, laboratory and field methods of body composition assessment. Link to article.
    • Digital anthropometry via three-dimensional optical scanning: evaluation of four commercially available systems. Link to article.
    • Explaining Discrepancies Between Total and Segmental DXA and BIA Body Composition Estimates Using Bayesian Regression. Link to article
    • Novel body fat estimation using machine learning and 3-dimensional optical imaging. Link to article.
    • Segmental body composition evaluation by bioelectrical impedance analysis and dual-energy X-ray absorptiometry: Quantifying agreement between methods. Link to article.
    • Agreement of bioelectrical resistance, reactance, and phase angle values from supine and standing bioimpedance analyzers. Link to article.
  • Time-Restricted Feeding Plus Resistance Training in Active Females (2018)
    • Time-restricted feeding plus resistance training in active females: a randomized trial. Link to article.
    • Body fat gain and loss differentially influence validity of dual-energy x-ray absorptiometry and multifrequency bioelectrical impedance analysis during simultaneous fat-free mass accretion. Link to article.
    • Changes in total and segmental bioelectrical resistance are correlated with whole-body and segmental changes in lean soft tissue following a resistance training intervention. Link to article.
    • Cross-sectional and longitudinal agreement between two multifrequency bioimpedance devices for resistance, reactance, and phase angle values. Link to article.
  • Body Composition Assessment in Physique Athletes (2017)
    • Fat-free Mass Characteristics of Muscular Physique Athletes. Link to article.
    • Body Composition Assessment in Male and Female Bodybuilders: A 4-Compartment Model Comparison of Dual-Energy X-Ray Absorptiometry and Impedance-Based Devices. Link to article.
    • Resting metabolic rate in muscular physique athletes: validity of existing methods and development of new prediction equations. Link to article.
    • Precision of Dual-Energy X-Ray Absorptiometry Reflection Scans in Muscular Athletes. Link to article.
    • Changes in Body Composition and Neuromuscular Performance Through Preparation, 2 Competitions, and a Recovery Period in an Experienced Female Physique Athlete. Link to article.
  • Responses to 24-hour Fasting with β-Hydroxy β-methylbutyrate Supplementation (2017)
    • β-Hydroxy β-methylbutyrate free acid alters cortisol responses, but not myofibrillar proteolysis, during a 24-h fast. Link to article.
    • Reliability of hunger-related assessments during 24-hour fasts and their relationship to body composition and subsequent energy compensation. Link to article.
  • Effects of Commercially Available Pre-Workout Supplements on Exercise Performance (2016)
    • Effects of two pre-workout supplements on concentric and eccentric force production during lower body resistance exercise in males and females: a counterbalanced, double-blind, placebo-controlled trial. Link to article.

Current Lab Members

Doctoral Students

Madelin Siedler, M.S., M.A.

Madelin Siedler

  • Degree program: Ph.D. in Exercise Physiology, focus in Body Composition & Metabolism
  • Educational background
    • B.A. in Political Studies at Bard College, Annandale-on-Hudson, NY
    • M.A. in Health Communication at Emerson College, Boston, MA
    • M.S. in Exercise Science (concentration: Strength and Conditioning) at University of South Florida, Tampa, FL
      • Research project: The effect of moderate intermittent versus continuous energy restriction on body composition, resting metabolic rate, and hunger and eating behaviors in resistance-trained females (advisor: Bill Campbell, Ph.D.)
  • Career goals: Teach, research, and develop guidelines for exercise and sports nutrition
  • Hometown: Palmer, Alaska
  • Hobbies: Lifting (and dancing) to ‘90s and 2000s music, enjoying the outdoors

Christian Rodriguez, M.S., CPT

Christian Rodriguez

  • Degree program: Ph.D. in Exercise Physiology, focus in Sports Nutrition
  • Educational background
    • B.S. in Kinesiology, Texas Tech University, Lubbock, TX
    • M.S. in Kinesiology, Texas Tech University, Lubbock, TX
  • Career goals: Teach and research at the university level
  • Hometown: Lubbock, Texas
  • Hobbies: Lifting, Reading, Watching Movies, Singing, Playing Guitar

Master's Degree Students

Christian LaValle 

Christian LaValle

  • Degree program: M.S. in Kinesiology (Human Performance Track)
  • Career goals: To work with my mom and dad in their integrative medicine practice, as well as do sports performance for professional athletes. 
  • Hometown: Lakeside, Texas
  • Hobbies: lifting, cooking, taking my dog on walks, spending time with my girlfriend, hunting, pickle ball, golf and jiu jitsu


Ethan Tinoco

Ethan Tinoco

  • Degree program: M.S. in Kinesiology (Human Performance Track)
  • Career goals: Research and University Professor
  • Hometown: Cypress, Texas
  • Hobbies: Weightlifting, Eating new foods, Watching horror movies




Undergraduate Students

Alexandra Brojanac  

Alexandra Brojanac

  • Degree program: B.S. in Kinesiology, minor in Sports MedicineMcNair Scholar & TrUE Scholar
  • Career goals: attend graduate school to become an Athletic Trainer
  • Hometown: Brookfield, Wisconsin
  • Hobbies: working out, spending time with friends and cooking!

Jaylynn Rasco 


  • Degree program: B.S. in Nutrition, minor in Biology
    • BAT-LSAMP Scholar & TrUE Scholar
  • Career goals: Attend Phyician Assistant school and become a certified Physican Assistant.
  • Hometown: Las Vegas, New Mexico
  • Hobbies: Tennis, working out, watching movies, and spending time with friends



Laboratory Capabilities

The primary capabilities of the laboratory are advanced body composition assessment and metabolic assessments. Additional facilities for evaluating muscular performance and implementing training programs are located in adjacent laboratories.

The specific capabilities of the laboratory are:

  • Producing molecular-level multi-compartment model body composition models (see figure below).

Grant Tinsley - Multi-Compartment Model

  • Total and segmental body composition analysis
    • Lean soft tissue or fat-free mass
    • Fat mass
    • Bone mineral content
  • Muscle cross-sectional area, thickness, and quality
  • Visceral fat estimation
  • Fluid analysis
    • Total body water
    • Intracellular water
    • Extracellular water
  • Automated anthropometric analysis
    • Total and segmental volumes
    • Circumferences and lengths of virtually any body segment
  • Bioelectrical parameter analysis
    • Resistance, reactance, and impedance
    • Phase angle
  • Resting metabolic rate assessment
  • Substrate oxidation assessment


KSM 114

  • Dual-energy x-ray absorptiometry (DXA)
    • GE Lunar Prodigy
    • GE iDXA (located in adjacent shared laboratory)


  • Air displacement plethysmography
    • Cosmed Bod Pod

Bod Pod

  • Bioimpedance spectroscopy (BIS)
    • Impedimed SFB7
  • Multi-frequency bioelectrical impedance analysis (MFBIA) with segmental body composition capabilities
    • Seca mBCA 514/515
  • Single-frequency bioelectrical impedance analysis (SFBIA) with segmental body composition capabilities
    • RJL Quantum V


3d scanners

  • Consumer-grade bioelectrical impedance analysis scales (for evaluation)

Consumer BIA

  • Ultrasonography
  • Electrical impedance myography (EIM)
    • Skulpt Chisel
  • Indirect calorimetry
    • ParvoMedics TrueOne 2400
    • Cosmed FitMate WM

Indirect calorimetry

  • Body mass scales
    • Calibrated scale (modified Tanita, Corp. Model BWB-627-A)
    • Standard Seca body mass scale with stadiometer
  • Ten computer workstations for data processing/analysis
  • Padded tables for supine assessments

Department of Kinesiology & Sport Management

  • Address

    Box 43011, Texas Tech University, 2500 Broadway, Lubbock, TX 79409
  • Phone