Tabel 2. CrossFit® intervention studies.
Study N (M/F) Participants Duration Program Main outcome
Barfield and
Anderson (2014)
25/0 active 12 weeks CrossFit® template
program (5 d/w)
↑ aerobic capacity (6%);
muscle endurance (22%)
Murawska-Cialowicz et al. (2015) 15/15 active 3 months 2d/w; 2 mixed WOD
every day
↑lean body mass; Wingate test; VO2max
(just women); brain-derived neurotrophic factor
↓ body fat (in women)
Drake et al. (2017) 6/0 active 4 weeks CrossFit® template program (5 d/w) ↑ inflammatory status
↓ mood state performance
no significant changes in strength,
endurance, body composition
Brisebois et al. (2018) 4/10 active 8 weeks 3d/w; unique program, mixed training sessions ↑ VO2max; lean body mass; strength
1 RM (bench press, leg press)
Crawford et al. (2018a) 13/12 untrained 6 weeks CrossFit® template program (5 d/w) ↑ 1 RM back squat, strict press, deadlift; VO2max
Feito et al. (2018b) 9/17 3+ months
experience with CrossFit®
16 weeks 2d/w; unique program; 51% strength workouts, 49%
metabolic conditioning
↑ 3 mixed WOD; 5 RM front squat; lean body mass; bone mineral content
improvements (greater in women)
↓ body fat
Kephart et al. (2018) 9/3 6+ months
experience with CrossFit®,
on ketodiet
3 months not described ↑ push-up test
↓ body fat
no changes in 1 RM back squat,
400m run, VO2peak
Crawford et al. (2018b) 13/12 untrained 6 weeks CrossFit® template program (5 d/w) no relationship between RPE and
heart rate variability
Tibana et al. (2019b) 0/1 elite CrossFitter 6 months 5d/w competition CrossFit program acute chronic workload ratio (ACWR):
50% of weeks outside the “safe zone”;
no relationship between RPE, heart rate
variability, ACWR;
no influence on well-being status
Poderoso et al. (2019) 17/12 6+ months
experience with CrossFit®
6 months CrossFit® template program (5 d/w) elevated testosterone level (greater changes in men); lower cortisol level (greater changes in women); no changes in lymphocytes
Cosgrove et al. (2019) 22/23 0-6 and 7+ months
experience with CrossFit®
6 months CrossFit® template program (5 d/w) ↑ 1 RM back squat, bench press,
deadlift, pull-up test;
1,5 km run (women with less experience)
Durkalce-Michalski et al. (2019) 11/10 CrossFitters on ketodiet 4 weeks not described ↑ utilization of fat under aerobic load (just men)
↓↑ - significant changes; WOD - Workout of the Day; M - male; F - female; w- week; d- day; RPE - rated perceived exertion