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CONSUMPTION OF AN ORAL CARBOHYDRATE-PROTEIN GEL IMPROVES CYCLING ENDURANCE AND PREVENTS POSTEXERCISE MUSCLE DAMAGE

SAUNDERS MICHAEL J.; LUDEN, NICHOLAS D.; HERRICK, JEFFREY E.
The Journal of Strength & Conditioning Research: August 2007
ORIGINAL RESEARCH: PDF Only

ABSTRACTInvestigators have reported improved endurance performance and attenuated post- exercise muscle damage with carbohydrate-protein beverages (CHO+P) versus carbohydrate-only beverages (CHO). However, these benefits have been demonstrated only when CHO+P was administered in beverage-form, and exclusively in male subjects. Thus, the purposes of this study were to determine if an oral CHO+P gel improved endurance performance and post-exercise muscle damage compared to a CHO gel, and determine if responses were similar between genders. Thirteen cyclists (8 men, 5 women; JOURNAL/jscr/04.02/00124278-200708000-00005/ENTITY_OV0312/v/2017-07-20T235335Z/r/image-pngO2peak = 57.9 ± 7.0 ml·kg-1·min-1) completed two timed cycle-trials to volitional exhaustion at 75% of JOURNAL/jscr/04.02/00124278-200708000-00005/ENTITY_OV0312/v/2017-07-20T235335Z/r/image-pngO2peak. At 15-minute intervals throughout these rides, subjects received CHO or CHO+P gels, which were matched for carbohydrate content (CHO = 0.15 g CHO·kg BW-1; CHO+P = 0.15 g CHO + 0.038 g protein·kg BW-1). Trials were performed using a randomly counterbalanced, double-blind design. Subjects rode 13% longer (p > 0.05) when utilizing the CHO+P gel (116.6 ± 28.5 minutes) versus the CHO gel (102.8 ± 25.0 minutes). In addition, men (101.8 ± 24.6; 114.8 ± 26.2) and women (104.4 ± 28.6; 119.6 ± 34.9) responded similarly to the CHO and CHO+P trials, with no significant treatment-by-gender effect. Postexercise creatine kinease (CK) was not significantly different between treatments. However, CK increased significantly following exercise in the CHO trial (183 ± 116; 267 ± 214 U·L-1), but not the CHO+P trial (180 ± 133; 222 ± 141 U·L-1). Therefore, to prolong endurance performance and prevent increases in muscle damage, it is recommended that male and female cyclists consume CHO+P gels rather than CHO gels during and immediately following exercise.

Investigators have reported improved endurance performance and attenuated post- exercise muscle damage with carbohydrate-protein beverages (CHO+P) versus carbohydrate-only beverages (CHO). However, these benefits have been demonstrated only when CHO+P was administered in beverage-form, and exclusively in male subjects. Thus, the purposes of this study were to determine if an oral CHO+P gel improved endurance performance and post-exercise muscle damage compared to a CHO gel, and determine if responses were similar between genders. Thirteen cyclists (8 men, 5 women; JOURNAL/jscr/04.02/00124278-200708000-00005/ENTITY_OV0312/v/2017-07-20T235335Z/r/image-pngO2peak = 57.9 ± 7.0 ml·kg-1·min-1) completed two timed cycle-trials to volitional exhaustion at 75% of JOURNAL/jscr/04.02/00124278-200708000-00005/ENTITY_OV0312/v/2017-07-20T235335Z/r/image-pngO2peak. At 15-minute intervals throughout these rides, subjects received CHO or CHO+P gels, which were matched for carbohydrate content (CHO = 0.15 g CHO·kg BW-1; CHO+P = 0.15 g CHO + 0.038 g protein·kg BW-1). Trials were performed using a randomly counterbalanced, double-blind design. Subjects rode 13% longer (p > 0.05) when utilizing the CHO+P gel (116.6 ± 28.5 minutes) versus the CHO gel (102.8 ± 25.0 minutes). In addition, men (101.8 ± 24.6; 114.8 ± 26.2) and women (104.4 ± 28.6; 119.6 ± 34.9) responded similarly to the CHO and CHO+P trials, with no significant treatment-by-gender effect. Postexercise creatine kinease (CK) was not significantly different between treatments. However, CK increased significantly following exercise in the CHO trial (183 ± 116; 267 ± 214 U·L-1), but not the CHO+P trial (180 ± 133; 222 ± 141 U·L-1). Therefore, to prolong endurance performance and prevent increases in muscle damage, it is recommended that male and female cyclists consume CHO+P gels rather than CHO gels during and immediately following exercise.

Address correspondence to Dr. Michael J. Saunders, saundemj@jmu.edu.

© 2007 National Strength and Conditioning Association