ישראלבודי - כרום פיקלונט

אתה מביא לי מאמר בלי סימוכין של אתר מסחרי שמוכר את המוצר, מה אתה רוצה שהם יגידו, שהמוצר לא עובד? הנה מחקר שמוכיח ששילוב של אימוני משקולות עם תיסוף בכרום פיקולנט לא משפר את הרכב הגוף ולא משפר את הכוח, והנה מחקר שני שבדק השפעות של תיסוף בכרום פיקולנט עם הרכב הגוף ועל הרגישות לאינסולין. לא היה הבדל בין הקבוצות שתפסו לבין שלא תפסו בתוסף.

Effects of resistance training and chromium picolinate on body composition and skeletal muscle in older men

Wayne W. Campbell1, Lyndon J. O. Joseph2, Stephanie L. Davey1, Deanna Cyr-Campbell2, Richard A. Anderson3, and William J. Evans1
1 Nutrition, Metabolism, and Exercise Laboratory, Donald W. Reynolds Department of Geriatrics, University of Arkansas for Medical Sciences, and Veterans Affairs Geriatric Research, Education, and Clinical Center, Little Rock, Arkansas 72205; 2 Noll Physiological Research Center, The Pennsylvania State University, University Park, Pennsylvania 16802; and 3 Beltsville Human Nutrition Research Center, US Department of Agriculture, Beltsville, Maryland 20705
The effects of chromium picolinate (CrPic) supplementation and resistance training (RT) on skeletal muscle size, strength, and power and whole body composition were examined in 18 men (age range 56-69 yr). The men were randomly assigned (double-blind) to groups (n = 9) that consumed either 17.8 µmol Cr/day (924 µg Cr/day) as CrPic or a low-Cr placebo for 12 wk while participating twice weekly in a high-intensity RT program. CrPic increased urinary Cr excretion ~50-fold (P < 0.001). RT-induced increases in muscle strength (P < 0.001) were not enhanced by CrPic. Arm-pull muscle power increased with RT at 20% (P = 0.016) but not at 40, 60, or 80% of the one repetition maximum, independent of CrPic. Knee-extension muscle power increased with RT at 20, 40, and 60% (P < 0.001) but not at 80% of one repetition maximum, and the placebo group gained more muscle power than did the CrPic group (RT by supplemental interaction, P < 0.05). Fat-free mass (P < 0.001), whole body muscle mass (P < 0.001), and vastus lateralis type II fiber area (P < 0.05) increased with RT in these body-weight-stable men, independent of CrPic. In conclusion, high-dose CrPic supplementation did not enhance muscle size, strength, or power development or lean body mass accretion in older men during a RT program, which had significant, independent effects on these measurements.

Effects of Chromium Picolinate Supplementation on Insulin Sensitivity, Serum Lipids, and Body Composition in Healthy, Nonobese, Older Men and Women

Paula Amatoa, Arlene J. Moralesa and Samuel S. C. Yena

a Department of Reproductive Medicine, University of California, San Diego, La Jolla, California.
Paula Amato, Department of Reproductive Medicine, University of California, San Diego, 9500 Gilman Drive, 0633, La Jolla, CA 92093-0633 E-mail: pamato@ucsd.edu .
Decision Editor: John E. Morley, MB, BCh
Background. Chromium is an essential nutrient required for carbohydrate and lipid metabolism. Chromium supplementation in humans has been reported to improve glucose metabolism and improve serum lipid parameters and to reduce body fat; parameters that worsen with aging. As a result, chromium picolinate has been widely promoted as a health aid for the general population. The purpose of the study was to examine the effects of chromium supplementation on insulin sensitivity, serum lipids, and body composition in nonobese, healthy men and women of advanced age.
Methods. A randomized, double-blind, placebo-controlled study with 19 subjects (9 men and 10 women), aged 63–77, were given either chromium picolinate, 1000 µg/d, or a placebo for 8 weeks. Serum lipids were measured at baseline and 8 weeks. Insulin sensitivity and body composition were measured with the minimal-model intravenous glucose tolerance test and dual-energy x-ray absorptiometry scan, respectively, at baseline and after 8 weeks of chromium or placebo supplementation.
Results. No significant change in serum lipids, insulin sensitivity, or body composition was observed in the chromium group compared with the placebo group. Conclusions. Chromium picolinate supplementation alone does not appear to improve insulin sensitivity, serum lipids, or change body composition in nonobese, healthy men and women of advanced age.