An interventional study of Dextrose and Maltodextrin in Resistance Training, Sports Nutrition and Dietary Carbohydrates, sponsored by Istanbul Gelisim University. Completed at 1 site in Turkey (Türkiye). Per ClinicalTrials.gov, last updated 2026-10-15.
Sponsored by Istanbul Gelisim University · Not applicable, Interventional, and Other
This randomized, triple-blinded, counterbalanced crossover trial compared three carbohydrate beverages that provided the same amount of carbohydrate (30 g) but differed in carbohydrate source: dextrose, maltodextrin, and highly branched cyclic dextrin (HBCD). Resistance-trained adults completed a familiarization session, a one-repetition maximum (1RM) testing session, and three experimental sessions separated by at least 7 days. In each experimental session, participants ingested one of the beverages in three 10-g servings and performed five sets of up to 15 repetitions at 62.5% of 1RM in the squat, bench press, and bench pull. Mechanical performance, blood glucose and lactate, perceived exertion, and gastrointestinal symptoms were assessed during or immediately after exercise; perceived recovery and muscle soreness at 24 and 48 hours; and serum creatine kinase and cortisol at 48 hours.
Participants were randomly allocated (RANDOM.ORG) to the six possible sequences of the three beverages in a counterbalanced manner. The allocation sequence was generated before data collection by a researcher not involved in testing, data collection, or statistical analyses. The beverages were matched for taste, color, and volume by an external researcher from a professional food laboratory (Life Pro Nutrition, Madrid, Spain) and delivered in identical containers coded 911, 912, and 913; the key linking codes to beverages was held by this researcher until all statistical analyses had been completed. The total dose (30 g) was divided into three servings of 10 g, each dissolved in 100 mL of water, ingested 15 minutes after the warm-up (immediately before the squat) and immediately after the squat and bench press exercises. Participants arrived after a minimum 6-hour fast, maintained their habitual diet, avoided strenuous exercise for 48 hours, and refrained from caffeine or other stimulants for 8 hours before testing. Barbell velocity was recorded with a linear position transducer (GymAware RS). Capillary blood glucose and lactate were measured 90 seconds into the 5-minute rest after each exercise; venous blood for creatine kinase and cortisol was collected 48 hours after the session.
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Participants ingested 30 g of dextrose, divided into three 10-g servings each dissolved in 100 mL of water, during a standardized high-volume resistance training session (squat, bench press, bench pull; five sets of up to 15 repetitions at 62.5% of 1RM).
Dietary Supplement: Dextrose
Participants ingested 30 g of maltodextrin (DE15-18), divided into three 10-g servings each dissolved in 100 mL of water, during a standardized high-volume resistance training session (squat, bench press, bench pull; five sets of up to 15 repetitions at 62.5% of 1RM).
Dietary Supplement: Maltodextrin
Participants ingested 30 g of highly branched cyclic dextrin (HBCD), divided into three 10-g servings each dissolved in 100 mL of water, during a standardized high-volume resistance training session (squat, bench press, bench pull; five sets of up to 15 repetitions at 62.5% of 1RM).
Dietary Supplement: Highly Branched Cyclic Dextrin
Dextrose (Life Pro Nutrition, Madrid, Spain): 30 g in total, divided into three 10-g servings each dissolved in 100 mL of water, ingested 15 minutes after the warm-up (immediately before the squat) and immediately after the squat and bench press exercises. Matched for taste, color, and volume with the other beverages.
Maltodextrin DE15-18 (Sandek #150, Sanwa Starch Co., Ltd, Nara, Japan): 30 g in total, divided into three 10-g servings each dissolved in 100 mL of water, ingested 15 minutes after the warm-up (immediately before the squat) and immediately after the squat and bench press exercises. Matched for taste, color, and volume with the other beverages.
Highly branched cyclic dextrin (Cluster Dextrin, Glico Nutrition Co., Ltd, Osaka, Japan): 30 g in total, divided into three 10-g servings each dissolved in 100 mL of water, ingested 15 minutes after the warm-up (immediately before the squat) and immediately after the squat and bench press exercises. Matched for taste, color, and volume with the other beverages.
Fastest Mean Concentric Velocity per Set (MVfastest)
Fastest mean concentric barbell velocity (m/s) recorded within each of five sets of the squat, bench press, and bench pull, measured with a linear position transducer (GymAware RS), compared among the three beverage conditions.
Time frame: From the first beverage serving (immediately before the squat) to completion of the bench pull, approximately 60 minutes, in each of the three experimental sessions
Number of Repetitions Completed per Set
Number of repetitions completed in each of five sets (up to 15 repetitions at 62.5% of one-repetition maximum) of the squat, bench press, and bench pull, compared among the three beverage conditions.
Time frame: From the first beverage serving (immediately before the squat) to completion of the bench pull, approximately 60 minutes, in each of the three experimental sessions
Capillary Blood Glucose Concentration
Fingertip capillary blood glucose concentration (mg/dL) measured with a portable glucose monitoring system (Contour Plus Elite).
Time frame: 90 seconds into the 5-minute rest after the squat, bench press, and bench pull in each of the three experimental sessions
Capillary Blood Lactate Concentration
Fingertip capillary blood lactate concentration (mmol/L) measured with a portable lactate analyzer (Lactate Scout 4).
Time frame: 90 seconds into the 5-minute rest after the squat, bench press, and bench pull in each of the three experimental sessions
Rating of Perceived Exertion
Perceived exertion rated on a modified 1-10 Rating of Perceived Exertion (RPE) scale; higher scores indicate greater exertion.
Time frame: 5 minutes after completion of the resistance exercise protocol in each of the three experimental sessions
Gastrointestinal Symptoms
Stomach fullness, nausea, and abdominal cramping, each rated on an individual 1-10 scale.
Time frame: 5 minutes after completion of the resistance exercise protocol in each of the three experimental sessions
Perceived Recovery Status
Perceived recovery rated on the 0-10 Perceived Recovery Status (PRS) scale; higher scores indicate better perceived recovery.
Time frame: 24 hours and 48 hours after each of the three experimental sessions
Muscle Soreness
Muscle soreness rated on a 0-10 visual analogue scale (VAS); higher scores indicate greater soreness.
Time frame: 24 hours and 48 hours after each of the three experimental sessions
Serum Creatine Kinase Activity
Serum creatine kinase activity (U/L) determined by an enzymatic method (cobas c 501 analyzer) from venous blood.
Time frame: 48 hours after each of the three experimental sessions
Serum Cortisol Concentration
Serum cortisol concentration (µg/dL) determined by electrochemiluminescence immunoassay (cobas e 801 analyzer) from venous blood.
Time frame: 48 hours after each of the three experimental sessions
Plan to share: Yes — Individual participant data underlying the published results will be available from the corresponding author upon reasonable request.
Supporting information: Study protocol
Time frame: After publication of the study results.
Access criteria: Reasonable request to the corresponding author (Deniz Senturk, Istanbul Gelisim University).
No publications or documents are linked to this record.
Ran from May 2026 to primary completion in Jun 2026, 1 month.
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Studies of the drugs tested here: Glucose · Maltodextrin
Istanbul Gelisim University