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Gregory Severino, Marcos Sanchez-Gonzalez, Michelle Walters-Edwards, Michael Nordvall, Oksana Chernykh, Jason Adames, and Alexei Wong

cardiovascular health and prognosis ( Schwartz, La Rovere, & Vanoli, 1992 ). Heart rate variability (HRV), measured by the variation in the beat-to-beat intervals, is a noninvasive tool for the evaluation of cardiac autonomic function and is shown to be negatively influenced by menopause ( Brockbank, Chatterjee

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Joanne Perry, Ashley Hansen, Michael Ross, Taylor Montgomery, and Jeremiah Weinstock

applications includes physiological feedback mechanisms (i.e., biofeedback, neurofeedback). Heart rate variability (HRV) is a biofeedback measurement that has received increasing attention, largely due to improvements in availability and portability of technology ( Bar-Eli, 2002 ; Beauchamp, Harvey

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Mònica Solana-Tramunt, Jose Morales, Bernat Buscà, Marina Carbonell, and Lara Rodríguez-Zamora

indicates baseline salivary cortisol; HRV Rest , baseline heart-rate variability; TT, technical routine; HR, heart rate; La, capillary blood lactate concentration; SC Post , salivary cortisol after the training session; Rec 20–25 , HRV during the recovery period 20 to 25 minutes; Rec 25–30 , HRV during the

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Alejandro Javaloyes, Jose Manuel Sarabia, Robert Patrick Lamberts, and Manuel Moya-Ramon

response highlights the importance of monitoring properly, because without the RPE data, functional overreaching might be interpreted as an improvement in training status. In addition to HRR, heart-rate variability (HRV), which focuses on the variability of successive R–R intervals, 13 also gained

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Sara R. Sherman, Clifton J. Holmes, Alexander P. Demos, Tori Stone, Bjoern Hornikel, Hayley V. MacDonald, Michael V. Fedewa, and Michael R. Esco

Heart rate variability (HRV) has evolved as a noninvasive physiological marker which sport scientists and coaches can utilize to assess and optimize training adaptations and performance in their athletes. 1 – 6 HRV reflects global cardiac-autonomic modulation at the individual level, and proper

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Carlo Pruneti, Simone Ferrari, and Sara Guidotti

.67 26.9 HF% power mean 57.01 53.17 40.68 VLF total power mean 107.84 1531.78 2313 LF total power mean 77.33 4171.48 2668.38 HF total power mean 350.50 9887.92 4520.26 LF/HF ratio 0.22 0.42 0.59 Note. HR = heart rate; HRV = heart rate variability; VLF = very low frequency; LF = low frequency; HF = high

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Andrew A. Flatt, Jeff R. Allen, Clay M. Keith, Matthew W. Martinez, and Michael R. Esco

psychological stress and represents a physiological hallmark of training fatigue. 6 , 7 A noninvasive measure of autonomic function is heart rate variability (HRV), which is quantified in the time domain from successive beat-to-beat fluctuations. HRV increases as a result of vagal (ie

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QinLong Li, Charles J. Steward, Tom Cullen, Kaixuan Che, and Yue Zhou

negatively impact sleep. 5 For example, high-intensity evening exercise elicits sympathetic-mediated physiological responses, including an increase in nocturnal heart rate 3 , 4 and a reduction in heart rate variability (HRV). 3 Moreover, the stress of competition can manifest as negative mood states that

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Daniel J. Plews, Ben Scott, Marco Altini, Matt Wood, Andrew E. Kilding, and Paul B. Laursen

striving for peak performances, the need to effectively monitor human movement and physiological state are important so that more objective decisions around training can be made. 2 The regular assessment of heart rate variability (HRV) has immerged as a measure of “physiological state” that has grown in

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Brent A. Harper, Daniel G. Miner, Kevin Parcetich, and Jamie Price

increasing or decreasing the heart rate resulting in shortened or lengthened R–R intervals. Heart rate variability (HRV) measures the variation in time between 2 consecutive heartbeats or R–R intervals of a cardiac cycle, 3 – 5 provides insight into the connection between the autonomic and cardiac systems