Abstract
The aim of this study was to validate the quantification of internal training load (session rating perceived exertion, sRPE) and the effect of recall timing of sRPE during high-intensity functional training (HIFT) sessions. Thirteen male HIFT practitioners (age 27.2 ± 33 years, height 177.1 ± 4.0 cm, body mass 81.1 ± 9.0 kg) were monitored during two common HIFT training sessions: Fight Gone Bad (FGB) and Fran. The Edwards summated heart-rate-zone method was used as a reference measure of internal training load. The session-RPE rating was obtained using the CR-10 scale modified by Foster. The training load calculated by the Edwards-TRIMP index was significantly higher (p < 0.05) during the FGB (77.7 ± 4.9) than the Fran (19.8 ± 8.4) workout. There was a strong correlation (p < 0.05) between the Edwards-TRIMP index and the training load calculated by the sRPE in all time frames (0, 10, 20, and 30 min post-exercise). The RPE and sRPE measured at 30 min post-exercise time frame was significant lower than 0, 10, and 20 min post-exercise for both workouts. The session-RPE method is an easy and valid tool to evaluate internal training load for high intensity functional training practitioners.
Highlights
High-intensity functional training (HIFT) including CrossFit® modality comprises a mix of elevated intensity functional movements by using basic Olympic weightlifting techniques, power training, exercises with body-weight, and aerobic training [1,2]
high-intensity functional training (HIFT) has been widely practiced by people, there is currently limited evidence of training load monitoring in athletes performing these activities [5]
The results reported by the authors showed that the risk of overreaching issues was elevated when a “low” natural logarithm of the square root of the mean sum of the squared differences between R–R intervals (Ln rMSSD week) was seen in combination with a “high” acute-to-chronic workload ratio, measured by the session-RPE
Summary
High-intensity functional training (HIFT) including CrossFit® modality comprises a mix of elevated intensity functional movements by using basic Olympic weightlifting techniques, power training, exercises with body-weight, and aerobic training [1,2]. While HIFT are growing in the number of practitioners and popularity, debate on the safety and benefits of HIFT has emerged between the scientific literature and anecdotal reports from athletes, coaches, and physicians [3]. College of Sports Medicine (ACSM) reported HIFT as an exercise training modality with elevated risk. Sports 2018, 6, 68 of injury [4]. Among possible solutions for this injury risk, the monitoring of training load should be potentially considered [4]. HIFT has been widely practiced by people, there is currently limited evidence of training load monitoring in athletes performing these activities [5]
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