title: Ingestion of High Molecular Weight Carbohydrate Enhances Subsequent Repeated Maximal Power: A Randomized Controlled Trial.
abstract: Athletes in sports demanding repeat maximal work outputs frequently train concurrently utilizing sequential bouts of intense endurance and resistance training sessions. On a daily basis, maximal work within subsequent bouts may be limited by muscle glycogen availability. Recently, the ingestion of a unique high molecular weight (HMW) carbohydrate was found to increase glycogen re-synthesis rate and enhance work output during subsequent endurance exercise, relative to low molecular weight (LMW) carbohydrate ingestion. The effect of the HMW carbohydrate, however, on the performance of intense resistance exercise following prolonged-intense endurance training is unknown. Sixteen resistance trained men (23±3 years; 176.7±9.8 cm; 88.2±8.6 kg) participated in a double-blind, placebo-controlled, randomized 3-way crossover design comprising a muscle-glycogen depleting cycling exercise followed by ingestion of placebo (PLA), or 1.2 g•kg•bw-1 of LMW or HMW carbohydrate solution (10%) with blood sampling for 2-h post-ingestion. Thereafter, participants performed 5 sets of 10 maximal explosive repetitions of back squat (75% of 1RM). Compared to PLA, ingestion of HMW (4.9%, 90%CI 3.8%, 5.9%) and LMW (1.9%, 90%CI 0.8%, 3.0%) carbohydrate solutions substantially increased power output during resistance exercise, with the 3.1% (90% CI 4.3, 2.0%) almost certain additional gain in power after HMW-LMW ingestion attributed to higher movement velocity after force kinematic analysis (HMW-LMW 2.5%, 90%CI 1.4, 3.7%). Both carbohydrate solutions increased post-exercise plasma glucose, glucoregulatory and gut hormones compared to PLA, but differences between carbohydrates were unclear; thus, the underlying mechanism remains to be elucidated. Ingestion of a HMW carbohydrate following prolonged intense endurance exercise provides superior benefits to movement velocity and power output during subsequent repeated maximal explosive resistance exercise. This study was registered with clinicaltrials.gov (NCT02778373).
authors.affiliation: Department of Kinesiology, Texas Christian University, Fort Worth, Texas, United States of America.
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Oliver
authors.affiliation: Vitargo Global Sciences, Inc., Dana Point, California, United States of America.
authors.forename: Anthony L
authors.initials: AL
authors.lastname: Almada
authors.affiliation: Department of Kinesiology, Texas Christian University, Fort Worth, Texas, United States of America.
authors.forename: Leighsa E
authors.initials: LE
authors.lastname: Van Eck
authors.affiliation: Department of Kinesiology, Texas Christian University, Fort Worth, Texas, United States of America.
authors.forename: Meena
authors.initials: M
authors.lastname: Shah
authors.affiliation: Department of Kinesiology, Texas Christian University, Fort Worth, Texas, United States of America.
authors.forename: Joel B
authors.initials: JB
authors.lastname: Mitchell
authors.affiliation: Division of Health and Human Performance, George Mason University, Fairfax, Virginia, United States of America.
authors.forename: Margaret T
authors.initials: MT
authors.lastname: Jones
authors.affiliation: Exercise and Sport Science Department, University of Wisconsin - La Crosse, La Crosse, Wisconsin, United States of America.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Jagim
authors.affiliation: School of Sport and Exercise, Massey University, Wellington, New Zealand.
authors.forename: David S
authors.initials: DS
authors.lastname: Rowlands
mesh_terms: D002241:Carbohydrates / Q000737:chemistry*; D004311:Double-Blind Method; D006801:Humans; D007700:Kinetics; D008970:Molecular Weight; D010919:Placebos
chemical_list: D002241:Carbohydrates; D010919:Placebos