title: Can changes in resistance exercise workload influence internal load, countermovement jump performance and the endocrine response?
abstract: This study examined the influence of differing volume load and intensity (%1 repetition maximum[%1RM]) resistance exercise workouts on session rating of perceived exertion (sRPE) countermovement jump (CMJ) performance and endocrine responses. Twelve participants performed a workout comprising four exercises (bench press, back squat, deadlift and prone bench pull) in randomised order as either power (POW); 3 sets × 6 repetitions at 45%1RM × 3 min inter-set rest, strength (ST); 3 sets × 3 repetitions at 90%1RM × 3 min inter-set rest, or hypertrophy (HYP); 3 sets × 10 repetitions at 70%1RM × 1 min inter-set rest in a randomised-crossover design. CMJ performance and endocrine responses were measured immediately pre-, post-, 12, 24, 48 and 72 h post-exercise. POW sRPE (3.0 ± 1.0) was lower than ST (4.5 ± 1.0) (P = 0.01), and both were lower than HYP (8.5 ± 1.0) (P = 0.01). Duration of CMJ decrement was longer (P ≤ 0.05) for HYP (72 h) compared to POW (12 h) and ST (24 h). Testosterone concentration was greater (P ≤ 0.05) immediately post-exercise in HYP compared to POW and ST. In conclusion, less inter-set rest, greater volume load and intensity (%1RM) may increase sRPE, duration of CMJ performance decrement and testosterone responses in resistance exercise.
authors.affiliation: a School of Sport Science, Exercise and Health , The University of Western Australia , Crawley , Australia.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Hiscock
authors.affiliation: a School of Sport Science, Exercise and Health , The University of Western Australia , Crawley , Australia.
authors.forename: Brian
authors.initials: B
authors.lastname: Dawson
authors.affiliation: b Centre for Metabolomics, The University of Western Australia , Crawley , Australia.
authors.forename: Michael
authors.initials: M
authors.lastname: Clarke
authors.affiliation: a School of Sport Science, Exercise and Health , The University of Western Australia , Crawley , Australia.
authors.forename: Peter
authors.initials: P
authors.lastname: Peeling
mesh_terms: D000328:Adult; D018592:Cross-Over Studies; D006801:Humans; D006854:Hydrocortisone / Q000378:metabolism*; D008297:Male; D053580:Muscle Strength / Q000502:physiology; D018482:Muscle, Skeletal / Q000033:anatomy & histology / Q000502:physiology; D010465:Perception / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology; D059385:Plyometric Exercise; D055070:Resistance Training / Q000379:methods*; D012463:Saliva / Q000378:metabolism; D013739:Testosterone / Q000378:metabolism*
chemical_list: D013739:Testosterone; D006854:Hydrocortisone
keywords: Workload monitoring; cortisol; fatigue; testosterone; volume load