Acute and Chronic Catabolic Responses to CrossFit® and Resistance Training in Young Males

Abstract

Given the wide variety of conditioning program trainings employed, the present study compared the catabolic effects induced by CrossFit® and resistance training in moderately trained subjects. Twenty males joined either the CrossFit® group (n = 10; 30 min/day of “workout of the day”) or the resistance training (RT) group (n = 10; 30 min/day of resistance exercises) thrice a week, for 8 weeks. Salivary levels of cortisol, interleukin 1-beta (IL-1β), and uric acid were assessed via enzyme-linked immunosorbent assays before (PRE) and 30-min after (POST) SESSION 1 and SESSION 24. Variables’ percentual changes were computed as (POST-PRE)/PRE*100 in each session (Δ%). CrossFit® acutely increased cortisol levels in both sessions, with a significant decrease in Δ%cortisol from SESSION 1 to 24. In the RT group, cortisol values decreased in both sessions, only acutely. A significant decrease in IL-1β levels was registered acutely in both groups, in both sessions, whereas Δ%IL-1β was not different between the two groups. While uric acid levels increased in both groups acutely, a chronic downregulation of Δ%uric acid, from SESSION 1 to 24, was appreciated for the RT group only. Overall, CrossFit® appeared to induce more intense effects than the RT program as to the investigated catabolic responses.

Efectos del entrenamiento de sobrecarga tradicional vs CrossFit sobre distintas expresiones de la fuerza (Effects of traditional strength training vs CrossFit on different expressions of strength)

“…Según dichos autores, este efecto de interferencia se daría por un incremento en los niveles de cortisol, acompañado de una disminución del índice testosterona/ cortisol, lo que propiciaría un ambiente catabólico. Este aspecto está en concordancia con lo reportado por Faelli et al (2020), quienes encontraron en sujetos masculinos, mayores niveles de cortisol tras una sesión de entrenamiento de CrossFit, mientras que dicha hormona disminuyó luego del entrenamiento de fuerza tradicional.…”

Verletzungshäufigkeit und -prävalenz beim CrossFit® in Deutschland

“…Dies wird von physiologische Studien bestätigt, welche zeigten, dass CF WOD zu Herzfrequenzen von 95 -97 % der HFmax und Blutlaktatwerten von 14-15 mmol/L führten [4], [5]. Weiterhin führte CF zu höheren biochemischen Reaktionen als konventionelles Krafttraining, gemessen anhand verschiedener Marker im Speichel [6]. Längerfristig führte CF in unterschiedlichen Interventionen zu einer Verbesserung der Ausdauer, verschiedener Erscheinungsformen der Kraft sowie zu einer Steigerung der Muskelmasse mit geringem Zeitaufwand [7], [8].…”

Effects of 8 Weeks of High-Intensity Interval Training and Spirulina Supplementation on Immunoglobin Levels, Cardio-Respiratory Fitness, and Body Composition of Overweight and Obese Women

“…Within 24 h following the treatment, subjects were advised not to ingest alcohol, caffeine, theine, hot liquids, or smoke. In addition, subjects were advised not to ingest medications, performance-enhancing capsules, or other supplements during the study [ 39 ]. We instructed the participants to maintain their usual dietary intake and not to lower their energy intake, and also asked them to maintain their usual physical activity during the study [ 40 ].…”