Andrew A. Flatt

Andrew A. Flatt
Georgia Southern University | GSU ·  Department of Health and Kinesiology

31.64
 · 
PhD
About
58
Research items
30,127
Reads
571
Citations
Introduction
Andrew A. Flatt currently works at the Department of Health Sciences and Kinesiology, Georgia Southern University. Their current project is 'Heart Rate Variability and External Training Load Monitoring in Elite American Football Players Throughout a Preparatory and Competitive Season '.
Research Experience
Aug 2014
University of Alabama
Position
  • Graduate Teaching and Research Assistant
Apr 2013 - Aug 2014
Auburn University in Montgomery
Position
  • Visiting Researcher and Adjunct Faculty
Network
Cited By
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Following
Projects
Projects (2)
Project
The aim of the study is to examine how altitude training at 3860-4090 m in the Peruvian Altiplano and marathon competition at elite level, affect cardiac autonomic control, oxygen saturation (SO2), baroreflex sensitivity by assessment of both systolic (SP) and diastolic blood pressure (DP), Ventilation mechanics, red blood cells parameters, total mood disturbance (TMD) and body mass (BM) with specific nutritional intervention and mantaining an optimal hydration status in a professional wheelchair marathoner.
Research
Research items (58)
Article
Objectives To evaluate weekly heart rate variability (HRV) responses to varying training load among an Olympic rugby sevens team and to assess whether HRV responses informed on training adaptation. Design Retrospective. Methods Natural logarithm of the root mean square of successive differences (LnRMSSD), psychometrics and training load from a ru...
Article
Objectives: The purpose of this study was to evaluate heart rate variability and athlete self-report measures of recovery status (ASRM) in response to consecutive domestic and international tournaments among an elite rugby sevens team. Design: Retrospective Methods: Olympic-level rugby sevens players (n = 10) recorded post-waking natural logarithm...
Article
Full-text available
This case report demonstrates the effects of sport-related concussion (SRC) on heart rate variability (HRV) in an American college football player. Daily measures of resting, ultra-short natural logarithm of the root mean square of successive differences (LnRMSSD), subjective wellbeing, and Player Load were obtained each training day throughout a 4...
Article
Full-text available
The purpose of this study was to determine if recovery of cardiac-autonomic activity to baseline occurs between consecutive-day training sessions among positional groups of a collegiate football team during Spring camp. A secondary aim was to evaluate relationships between chronic (i.e., 4-week) HRV and training load parameters. Baseline HRV (lnRMS...
Article
Full-text available
Heart rate variability (HRV) is a physiological marker of training adaptation among athletes. However, HRV interpretation is challenging when assessed in isolation due to its sensitivity to various training and non-training-related factors. The purpose of this study was to determine the association between athlete-self report measures of recovery (...
Article
Full-text available
Objective: In two independent study arms, we determine the effects of strength training (ST) and high-intensity interval training (HIIT) overload on cardiac autonomic modulation by measuring heart rate (HR) and vagal heart rate variability (HRV). Methods: In the study, 37 well-trained athletes (ST: 7 female, 12 male; HIIT: 9 female, 9 male) were su...
Article
Full-text available
The purpose of this study was to analyze heart rate variability (HRV) oscillations before and after a marathon which involved trans-meridian air travel and substantial time zone differences in a professional wheelchair athlete with Charcot-Marie-Tooth (CMT) disease. The natural logarithm of the root mean square difference between adjacent normal R-...
Answer
An inexpensive alternative for continuous RR interval recording is an app called HRV Logger by Marco Altini. https://itunes.apple.com/us/app/heart-rate-variability-logger/id683984776?mt=8
I've used this app with the Polar H7 to assess HRV responses to various fluid ingestion (water, Gatorade). The RR intervals export as a .csv file that can easily be used in Kubios.
Article
Full-text available
A systems modelling approach can be used to describe and optimise responses to training stimuli within individuals. However, the requirement for regular maximal performance testing has precluded the widespread implementation of such modelling approaches in team-sport settings. Heart rate variability (HRV) can be used to measure an athlete's adaptat...
Article
Sanz-Quinto, S, López-Grueso, R, Brizuela, G, Flatt, AA, and Moya-Ramón, M. Influence of training models at 3,900-m altitude on the physiological response and performance of a professional wheelchair athlete: A case study. J Strength Cond Res XX(X): 000-000, 2018-This case study compared the effects of two training camps using flexible planning (FP...
Article
Full-text available
Despite having to endure a rigorous in-season training schedule, research evaluating daily physiological recovery status markers among American football players is limited. The purpose of this study was to determine if recovery of cardiac-autonomic activity to resting values occurs between consecutive-day, in-season training sessions among college...
Article
Full-text available
ABSTRACT Purpose: The primary purpose of this study was to determine the accuracy of the standard deviation of normal-to-normal intervals (SDNN) to root mean square of successive normal-to-normal interval differences (RMSSD) ratio from 1-minute recordings (SDNN:RMSSD1-min) compared to criterion recordings, as well as its relationship to low frequen...
Article
Flatt, AA, Esco, MR, Allen, JR, Robinson, JB, Earley, RL, Fedewa, MV, Bragg, A, Keith, CM, and Wingo, JE. Heart rate variability and training load among National Collegiate Athletic Association Division 1 college football players throughout spring camp. J Strength Cond Res XX(X): 000-000, 2017-The purpose of this study was to determine whether reco...
Poster
Full-text available
A hallmark sign of stress and inadequate recovery among athletes is an imbalance in autonomic nervous system activity, characterized by an elevated resting heart rate and reduced heart rate variability (HRV). Stress from training, competition, travel and academics can accumulate over the course of a football season, creating heightened potential fo...
Poster
Full-text available
Vagally-mediated heart rate variability (lnRMSSD) reflects cardiac-parasympathetic modulation and is commonly used as recovery status marker among athletes. Fitness level, body mass and physiological responses to training vary among positional groups in football. Thus, we hypothesize that lnRMSSD responses to training may also differ among position...
Article
Full-text available
The purpose of this study was to determine the agreement between a smartphone pulse finger sensor (SPFS) and electrocardiography (ECG) for determining ultra-short-term heart rate variability in 3 different positions. Thirty college-aged men (n = 15) and women (n = 15) volunteered to participate in this study. Sixty-second heart rate measures were s...
Article
Full-text available
Heart rate variability has been widely used to monitor athletes’ cardiac autonomic control changes induced by training and competition, and recently shorter recording times have been sought to improve its practicality. The aim of this study was to test the agreement between the (ultra-short-term) natural log of the root-mean-square difference of su...
Article
Full-text available
Objectives: The purpose of this study was to evaluate cardiac-parasympathetic and psychometric responses to competition preparation in collegiate sprint-swimmers. Additionally, we aimed to determine the relationship between average vagal activity and its daily fluctuation during each training phase. Design: Observational. Methods: Ten Division-1...
Poster
Full-text available
Resting heart rate variability (HRV) fluctuates on a daily basis in response to physical and psychological stressors and may provide useful information pertaining to fatigue and adaptation. However, there is limited research comparing HRV profiles between athletes of the same sport who differ by training status. PURPOSE: The purpose of this study w...
Article
Full-text available
The purpose of this study was to determine the agreement between a smartphone pulse finger sensor (SPFS) and electrocardiography (ECG) for determining ultra-short-term heart rate variability (HRV) in three different positions. Thirty college-aged men (n = 15) and women (n = 15) volunteered to participate in this study. Sixty second heart rate measu...
Article
Full-text available
The purpose of this study was to determine the agreement between a smartphone pulse finger sensor (SPFS) and electrocardiography (ECG) for determining ultra-short-term heart rate variability (HRV) in three different positions. Thirty college-aged men (n = 15) and women (n = 15) volunteered to participate in this study. Sixty second heart rate measu...
Article
PURPOSE: To determine if an acute bout of foam rolling has an effect on heart rate variability (HRV). METHODS: Seven subjects participated in this study (age = 22.25± 3.45 years, height = 173.67± 6.78 cm, weight = 71.67± 17.56 kg) and recorded baseline HRV on an electrocardiogram (ECG) for 5 minutes while laying supine. Following the baseline measu...
Article
Full-text available
The aim of this study was to examine the intra-day and inter-day reliability of ultrashort- term vagal-related heart rate variability (HRV) in elite rugby union players. Forty players from the Brazilian National Rugby Team volunteered to participate in this study. The natural log of the root mean square of successive RR interval differences (lnRMSS...
Article
Full-text available
The purpose of this study was to track changes in training load (TL) and recovery status indicators throughout a 2-week preseason and to interpret the meaning of these changes on an individual basis among 8 Division-1 female soccer players. Weekly averages for heart rate variability (lnRMSSD), TL and psychometrics were compared with effect sizes (E...
Article
The purpose of this study was to track changes in training load (TL) and recovery status indicators throughout a 2-week preseason and to interpret the meaning of these changes on an individual basis among 8 Division-1 female soccer players. Weekly averages for heart rate variability (lnRMSSD), TL and psychometrics were compared with effect sizes (E...
Article
The purpose of this study was to determine the agreement between a smartphone pulse finger sensor (SPFS) and electrocardiography (ECG) for determining ultra-short-term heart rate variability (HRV) in three different positions. Thirty college-aged men (n = 15) and women (n = 15) volunteered to participate in this study. Sixty second heart rate measu...
Article
This study aimed to compare the weekly natural log of the root-mean-square difference of successive normal RR intervals (lnRMSSDWeekly) and its coefficient of variation (lnRMSSDCV) in response to 5 weeks of preseason training in professional male futsal players. A secondary aim was to assess the relationship between lnRMSSDWeekly and lnRMSSDCV. The...
Article
Full-text available
BACKGROUND: Heart rate variability (HRV) is an objective physiological marker that may be useful for monitoring training status in athletes. However, research aiming to interpret daily HRV changes in female athletes is limited. The objectives of this study were (1) to assess daily HRV (i.e., log-transformed root mean square of successive R-R interv...
Article
Full-text available
The aim of this study was to determine whether the early response in weekly measures of HRV, when derived from a smartphone application, were related to the eventual change in VO2max following an off-season training program in female soccer athletes. 9 female collegiate soccer players participated in an 11-week off-season conditioning program. In t...
Article
Full-text available
This study evaluated the 7-day mean and CV of supine and standing ultra-short log transformed root mean square of successive R-R intervals multiplied by 20 (lnRMSSDx20) obtained with a smartphone application (app) in response to varying weekly training load (TL). Additionally, we aimed to determine if these values could be accurately assessed in as...
Article
The purpose of this study was to compare postexercise heart rate variability (HRV) immediately following acute bouts of treadmill (T) and cycle (C) exercise at 65% of mode-specific maximal oxygen consumption reserve (65% VO2 R). Fourteen apparently healthy men participated in this study. On two separate and randomized days, each participant perform...
Article
Full-text available
ABSTRACT Monitoring individual responses throughout training may provide insight to coaches regarding how athletes are coping to the current program. It is unclear if the evolution of heart rate variability (HRV) throughout training in team sport athletes can be useful in providing early indications of individual adaptation. The current study evalu...
Article
Full-text available
The aims of this study was to compare the LnRMSSD and the LnRMSSD:RR values obtained during a 5-min stabilization period with the subsequent 5-min criterion period and to determine the time course for LnRMSSD and LnRMSSD:RR stabilization at 1-min analysis in elite team-sport athletes. Thirty-five elite futsal players (23.9 ± 4.5 years; 174.2 ± 4.0...
Article
Full-text available
The aim of this study was to test the possibility of the ultra-short-term lnRMSSD (measured in 1-min post-1-min stabilization period) to detect training induced adaptations in futsal players. Twenty-four elite futsal players underwent HRV assessments pre- and post-three or four weeks preseason training. From the 10-min HRV recording period, lnRMSSD...
Article
The purpose of this study was to determine the accuracy of three general and two female-specific age-predicted maximal heart rate (HRmax) prediction equations in female collegiate athletes. Thirty female collegiate athletes (age = 21.5 ± 1.9 years, height = 164.7 ± 6.6 cm, weight = 61.3 ± 8.2 kg) participated. HRmax was determined with a maximal gr...
Article
Resting heart rate variability (HRV) is a potentially useful marker to consider for monitoring training status in athletes. However, traditional HRV data collection methodology requires a 5-min recording period preceded by a 5-min stabilization period. This lengthy process may limit HRV monitoring in the field due to time constraints and high compl...
Article
Full-text available
The purpose of this case study was to observe the relationships between resting heart rate (HR) and heart rate variability (HRV) measures and endurance race performance in a collegiate male cross country athlete throughout a competitive season. Resting heart rate measures were recorded daily by the athlete with a smart phone application in a seated...
Article
The purpose of this investigation was to determine the agreement between multi-frequency bioelectrical impedance analysis (BIA) and dual-energy x-ray absorptiometry (DXA) for measuring body fat percentage (BF%), fat-free-mass (FFM), and total body and segmental lean soft tissue (LST) in collegiate female athletes. Forty-five female athletes (age =...
Conference Paper
Purpose: Resting heart rate variability (HRV) is a potentially useful marker to consider for monitoring training status in athletes. However, traditional HRV data collection methodology requires a 5-minute recording period preceded by a 5-minute stabilization period. This lengthy process may limit HRV monitoring in the field due to time constraints...
Article
Full-text available
The purpose of this study was to determine if the HRindex Method (VO2max = [6 x HRindex - 5] x 3.5, where HRindex = HRmax/HRrest) was accurate for tracking changes in VO2max following 8-weeks of endurance training among collegiate female soccer players. Predicted VO2max via the HRindex Method and observed VO2max from a maximal exercise test on a tr...
Article
Full-text available
The purpose of this study was to determine if the HRindex Method (VO2max = [6 x HRindex – 5] x 3.5, where HRindex = HRmax/HRrest) was accurate for tracking changes in VO2max following 8‐weeks of endurance training among collegiate female soccer players. Predicted VO2max via the HRindex Method and observed VO2max from a maximal exercise test on a tr...
Article
Full-text available
The purpose of this study was to evaluate the agreement of the vagal-related heart rate variability index, log-transformed root mean square of successive R-R intervals (lnRMSSD), measured under ultra-short-term conditions (< 60 seconds) with conven-tional longer term recordings of 5 minutes in collegiate athletes under resting and post-exercise con...
Conference Paper
Full-text available
PURPOSE: Heart rate variability (HRV) and heart rate recovery (HRR) are noninvasive indicators of cardiovascular autonomic control and are becoming popular for observing physiological changes associated exercise training and reflecting recovery status. Previous research suggests there is a relationship between HRV and HRR, though the extent of this...
Conference Paper
Full-text available
PURPOSE: The purpose of this study was to determine if the mean value of 5 and 3 day per week heart rate variability (HRV) recordings from both supine and standing positions would accurately reflect the weekly mean value in collegiate female soccer players during spring season training. METHODS: Twelve female soccer players (height = 165.12 ± 5.32...
Conference Paper
Full-text available
PURPOSE: This study aimed to determine if resting heart rate variability (HRV) values reflect previous day training load in a team of collegiate female soccer players after the first day of spring season strength and conditioning (S&C) training. METHODS: A team of female collegiate soccer players (n = 11; height = 165.16 ± 5.82 cm; weight = 60.26 ±...
Article
Full-text available
The purpose of this investigation was to cross-validate the ithlete™ heart rate variability smart phone application with an electrocardiograph for determining ultra-short-term root mean square of successive R-R intervals. The root mean square of successive R-R intervals was simultaneously determined via electrocardiograph and ithlete™ at rest in tw...
Data
Full-text available
Background: The primary purpose of this investigation was to determine the differences in resting heart rate variability and heart rate recovery between norm-referenced aerobic fitness groupings, independent of body composition, in Black men. Additionally, we sought to clarify the independent relationships that heart rate variability and heart rate...
Conference Paper
Full-text available
Purpose: The purpose of this investigation was to cross-validate the ithleteTM heart rate variability smart phone application with an electrocardiograph for determining ultra-short-term root mean square of successive R-R intervals. Methods: The root mean square of successive R-R intervals was simultaneously determined via electrocardiograph and it...