Acute effects of a thermogenic nutritional supplement on cycling time to exhaustion and muscular strength in college-aged men

Purpose: This study aimed to assess the requirement of protein in pre-exercise carbohydrate drinks for optimal endurance performance at high intensity and post-exercise fatigue recovery.Methods: Endurance performance at 85% V.⁢O2peak of young men (age 20 ± 0.9 years, V.⁢2peak 49.3 ± 0.3 L/min) was measured for two consecutive days using cycling time to exhaustion and total work exerted 2 h after three isocaloric supplementations: RICE (50 g, protein: 1.8 g), n = 7; SOY + RICE (50 g, protein: 4.8 g), n = 7; and WHEY + RICE (50 g, protein: 9.2 g), n = 7.Results: Endurance performance was similar for the three supplemented conditions. Nevertheless, maximal cycling time and total exerted work from Day 1 to Day 2 were improved in the WHEY + RICE (+21%, p = 0.05) and SOY-RICE (+16%, p = 0.10) supplemented conditions, not the RICE supplemented condition. Increases in plasma interleukin-6 (IL-6) were observed 1 h after exercise regardless of supplemented conditions. Plasma creatine kinase remained unchanged after exercise for all three supplemented conditions. Increases in ferric reducing antioxidant power (FRAP) after exercise were small and similar for the three supplemented conditions.Conclusion: Adding protein into carbohydrate drinks provides no immediate benefit in endurance performance and antioxidant capacity yet enhances fatigue recovery for the next day. Soy-containing carbohydrate drink, despite 50% less protein content, shows similar fatigue recovery efficacy to the whey protein-containing carbohydrate drink. These results suggest the importance of dietary nitrogen sources in fatigue recovery after exercise.

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Acute Effects Of Whole-body Vibration And Bicycle Ergometry On Muscular Strength And Flexibility

Medicine & Science in Sports & Exercise ◽

10.1249/00005768-200505001-01341 ◽

2005 ◽

Vol 37 (Supplement) ◽

pp. S262-S263 ◽

Cited By ~ 1

Author(s):

Patricia A. Burns ◽

Kristina S. Beekhuizen ◽

Patrick L. Jacobs

Keyword(s):

Muscular Strength ◽

Whole Body Vibration ◽

Whole Body ◽

Acute Effects ◽

Bicycle Ergometry ◽

Body Vibration

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Supplementation with Beef Extract Improves Exercise Performance and Reduces Post-Exercise Fatigue Independent of Gut Microbiota

Nutrients ◽

10.3390/nu10111740 ◽

2018 ◽

Vol 10 (11) ◽

pp. 1740 ◽

Cited By ~ 5

Author(s):

Tsung-Hsien Hsu ◽

Chien-Chao Chiu ◽

Yu-Chih Wang ◽

Ter-Hsin Chen ◽

Yi-Hsun Chen ◽

...

Keyword(s):

Gut Microbiota ◽

Grip Strength ◽

Blood Urea Nitrogen ◽

Exercise Performance ◽

Nutritional Supplement ◽

Serum Lactate ◽

Time To Exhaustion ◽

Dependent Manner ◽

Urea Nitrogen ◽

Beef Extract

Beef extract (BE) is a nutritional supplement obtained by cooking beef meat. Compared with traditional chicken essence or clam extract, BE is cheaper to produce and may be used for wound healing, as a chemotherapy supplement, or to prevent fatigue. In this study, we evaluated the potential beneficial effects of BE on exercise performance and the related role of the gut microbiota. Pathogen-free male BALB/c mice were divided into three groups to receive vehicle or BE (0, 12.3, or 24.6 mL/kg) by oral gavage for 28 days. Exercise performance was evaluated using forelimb grip strength, swimming time to exhaustion, and physiological levels of fatigue-related biomarkers (serum lactate, blood urea nitrogen, and glucose levels) after physical challenges. BE supplementation elevated endurance and grip strength in a dose-dependent manner; significantly decreased lactate and blood urea nitrogen levels after physical challenge; and significantly increased muscle glycogen content. The germ-free mice supplemented with BE or an equal-calorie portion of albumin did not show significant differences from the other groups in exercise performance and levels of related biomarkers. Therefore, BE supplementation improved endurance and reduced fatigue, which might be related to BE composition, but had no correlation with the gut microbiota.

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Reproducibility of the Cycling Time to Exhaustion at in Highly Trained Cyclists

Canadian Journal of Applied Physiology ◽

10.1139/h03-046 ◽

2003 ◽

Vol 28 (4) ◽

pp. 605-615 ◽

Cited By ~ 8

Author(s):

Paul B. Laursen ◽

Cecilia M. Shing ◽

David G. Jenkins

Keyword(s):

Aerobic Power ◽

Cycling Performance ◽

Peak Oxygen Uptake ◽

Time To Exhaustion ◽

Subject Variability ◽

Progressive Exercise ◽

Two Measures ◽

The Mean ◽

Cycling Time ◽

Within Subject Variability

The purpose of the present study was to examine, in highly trained cyclists, the reproducibility of cycling time to exhaustion (Tmax) at the power output equal to that attained at peak oxygen uptake ([Formula: see text]) during a progressive exercise test. Forty-three highly trained male cyclists (M ± SD; age = 25 + 6 yrs; weight = 75 ± 7 kg; [Formula: see text] = 64.8 ± 5.2 mlùkg−1•min−1) performed two Tmax tests one week apart. While the two measures of Tmax were strongly related (r = 0.884; p < 0.001), Tmax from the second test (245 ± 57 s) was significantly higher than that of the first (237 ± 57 s; p = 0.047; two-tailed). Within-subject variability in the present study was calculated to be 6 ± 6%, which was lower than that previously reported for Tmax in sub-elite runners (25%). The mean Tmax was significantly (p < 0.05) related to both the second ventilatory turnpoint (VT2; r = 0.38) and to [Formula: see text] (r = 0.34). Despite a relatively low within-subject coefficient of variation, these data demonstrate that the second score in a series of two Tmax tests may be significantly greater than the first. Moreover, the present data show that Tmax in highly trained cyclists is moderately related to VT2 and [Formula: see text]Key words: maximal aerobic power, endurance, fatigue, anaerobic threshold, cycling performance

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