Abstract
CrossFit™, a popular high-intensity training modality, has been the subject of scrutiny, with concerns of elevated risk of injury and health. Despite these concerns empirical evidence regarding physiologic stresses including acute oxidative stress is lacking. Therefore, the purpose of this investigation was to examine the acute redox response to a CrossFit™ bout. Furthermore, these findings were compared to a high-intensity treadmill bout as a point of reference. Ten males 26.4 ± 2.7 yrs having three or more months of CrossFit™ experience participated in the present study. Blood plasma was collected at four time points: Pre-exercise (PRE), immediately-post-exercise (IPE), 1 hr-post (1-HP) and 2 hr-post (2-HP), to examine oxidative damage and antioxidant capacity. Regarding plasma oxidative damage, CrossFit™ and Treadmill elicited a time-dependent increase of lipid peroxides 1-HP (CrossFit™=+143%, Treadmill=+115%) and 2-HP (CrossFit™=+256%, Treadmill+167%). Protein Carbonyls were increased IPE in CF only (+5%), while a time-dependent decrease occurred 1-HP (CrossFit™=−16%, Treadmill=−8%) and 2-HP (CF=−16%, TM=−1%) compared to IPE. Regarding antioxidant capacity, Ferric Reducing Antioxidant Power also demonstrated a time-dependent increase within CrossFit™ and Treadmill: IPE (CrossFit™=+25%, Treadmill=+17%), 1-HP (CrossFit™=+26%, Treadmill=+4.8%), 2-HP (CrossFit™=+20%, Treadmill=+12%). Total Enzymatic Antioxidant Capacity showed a time-dependent decrease in IPE (CrossFit™=−10%, Treadmill=−12%), 1-HP (CrossFit™=−12%, Treadmill=−6%), 2-HP (CrossFit™=−7%, Treadmill=−11%). No trial-dependent differences were observed in any biomarker of oxidative stress. The CrossFit™ bout elicited an acute blood oxidative stress response comparable to a traditional bout of high-intensity treadmill running. Results also confirm that exercise intensity and the time course of exercise recovery influence oxidative responses.
Highlights
In recent years there has been a growing popularity in alternative styles of exercise training
CF “CINDY” Treadmill points: before exercise (PRE) 20 minutes of exercise immediately post exercise (IPE) 1Hr 2Hr were taken at designated time points, represented by blood draw icons
The key findings of this study were that the two bouts produced equivocal oxidative stress responses in terms of delineating mode-specific effects
Summary
In recent years there has been a growing popularity in alternative styles of exercise training. High-intensity training modalities have been the subject of scrutiny, with concerns of elevated risk of injury and health (Bergeron et al, 2011). The chief program amongst these modalities is CrossFitTM, a short duration (i.e. less than 30 minutes), high-volume, and high-intensity exercise program (Bergeron et al, 2011; Larsen and Jenson, 2014; Hak et al, 2013). 4 - Auburn University at Montgomery, Department of Medical and Clinical Lab Sciences. 1 - Kennesaw State University, Department of Exercise Science and Sports Management. Authors submitted their contribution to the article to the editorial board. Accepted for printing in the Journal of Human Kinetics vol 47/2015 in September 2015
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