Graduate Thesis Or Dissertation
 

Carbohydrate loading, vitamin B-6 supplementation, and fuel metabolism during exercise of differing intensity in post-absorptive man

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  • Four young trained men were studied during 50 min of continuous bicycle ergometer exercise [30 min at 60%, 15 min at 80%, and 5 min at 90% maximal heart rate (MHR)] to elucidate changes in fuel metabolism resulting from a glycogen depletion-repletion regimen, and to determine the effect of supplemental vitamin B-6 (B6). The diets were: Week 1, 40% CHO normal diet (NC); Week 2, days 1-3 CHO 11% (LC), days 4-7 CHO 71% (HC); Week 3, same as week 2 but with an 8 mg B6 supplement each day (LC+B6, HC+B6). The men exercised after an overnight fast on days 4 and 7, upon completing the depletion or repletion phase. Blood was collected before exercise (PRE), during the 80% MHR work (DURING), immediately after completion of the 90% MHR work (POST), and 30 min and 60 min after exercise (30 MIN POST, 60 MIN POST). Plasma FFA concentrations were from 30% to 75% higher (p<0.05) after the LC and LC+B6 diets than after the NC-1, NC-2, HC, or HC+B6 diets, and B6 did not appear to affect plasma FFA levels. Plasma glucose values were from 3% to 4% lower (p<0.01) for DURING HC and HC+B6 than DURING NC-1. Since plasma HC and HC+B6 lactate values were 57% higher (p<0.05) than DURING control values, the simultaneously low glucose and high lactate levels indicate that glucose was primarily derived from muscle glycogen in the HC and HC+B6 conditions. Addition of B6 to the HC diet resulted in elevated POST lactate levels, but this difference was not significant. LC glucose and lactate values did not differ significantly from control values. However, PRE LC+B6 glucose values were 12% lower than PRE control values (p<0.02) and continued to be lower during exercise. POST and 30 MIN POST LC+B6 values were 47% lower than the LC values (p<0.005 and p<0.01, respectively). The glucose and lactate data indicate that B6 supplementation does alter CHO metabolism when added to a glycogen depletion-repletion regimen. Due to the possible role of glycogen phosphorylase as an expanding depot for B6 storage, supplementation with B6 may cause a more rapid emptying of muscle glycogen stores and a reduction of athletic endurance.
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