Secondary Logo

Institutional members access full text with Ovid®

Heart Rate Variability and Training Load Among National Collegiate Athletic Association Division 1 College Football Players Throughout Spring Camp

Flatt, Andrew A.1,2; Esco, Michael R.1; Allen, Jeff R.3; Robinson, James B.3; Earley, Ryan L.4; Fedewa, Michael V.1; Bragg, Amy5; Keith, Clay M.3; Wingo, Jonathan E.1

The Journal of Strength & Conditioning Research: November 2018 - Volume 32 - Issue 11 - p 3127–3134
doi: 10.1519/JSC.0000000000002241
Original Research

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 32(11): 3127–3134, 2018—The purpose of this study was to determine whether 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) heart rate variability (HRV) and training load parameters. Baseline HRV (lnRMSSD_BL) was compared with HRV after ∼20 hours of recovery before next-day training (lnRMSSDpost20) among positional groups composed of SKILL (n = 11), MID-SKILL (n = 9), and LINEMEN (n = 5) with a linear mixed model and effect sizes (ES). Pearson and partial correlations were used to quantify relationships between chronic mean and coefficient of variation (CV) of lnRMSSD (lnRMSSD_chronic and lnRMSSDcv, respectively) with the mean and CV of PlayerLoad (PL_chronic and PL_cv, respectively). A position × time interaction was observed for lnRMSSD (p = 0.01). lnRMSSD_BL was higher than lnRMSSDpost20 for LINEMEN (p < 0.01; ES = large), whereas differences for SKILL and MID-SKILL were not statistically different (p > 0.05). Players with greater body mass experienced larger reductions in lnRMSSD (r = −0.62, p < 0.01). Longitudinally, lnRMSSDcv was significantly related to body mass (r = 0.48) and PL_chronic (r = −0.60). After adjusting for body mass, lnRMSSDcv and PL_chronic remained significantly related (r = −0.43). The ∼20-hour recovery time between training sessions on consecutive days may not be adequate for restoration of cardiac-parasympathetic activity to baseline among LINEMEN. Players with a lower chronic training load throughout camp experienced greater fluctuation in lnRMSSD (i.e., lnRMSSDcv) and vice versa. Thus, a capacity for greater chronic workloads may be protective against perturbations in cardiac-autonomic homeostasis among American college football players.

1Exercise Physiology Laboratory, Department of Kinesiology, University of Alabama, Tuscaloosa, Alabama;

2Department of Health Sciences, Armstrong State University, Savannah, Georgia;

3Department of Athletics, Sports Medicine, University of Alabama, Tuscaloosa, Alabama;

4Department of Biological Sciences, University of Alabama, Tuscaloosa, Alabama; and

5Department of Athletics, Sports Nutrition, University of Alabama, Tuscaloosa, Alabama

Address correspondence to Andrew A. Flatt,

Copyright © 2018 by the National Strength & Conditioning Association.