In:
Journal of Applied Physiology, American Physiological Society, Vol. 85, No. 4 ( 1998-10-01), p. 1349-1356
Abstract:
Young [ n = 5, 30 ± 5 (SD) yr] and middle-aged ( n = 4, 58 ± 4 yr) men and women performed single-leg knee-extension exercise inside a whole body magnetic resonance system. Two trials were performed 7 days apart and consisted of two 2-min bouts and a third bout continued to exhaustion, all separated by 3 min of recovery. 31 P spectra were used to determine pH and relative concentrations of P i , phosphocreatine (PCr), and β-ATP every 10 s. The subjects consumed 0.3 g ⋅ kg −1 ⋅ day −1 of a placebo ( trial 1) or creatine ( trial 2) for 5 days before each trial. During the placebo trial, the middle-aged group had a lower resting PCr compared with the young group (35.0 ± 5.2 vs. 39.5 ± 5.1 mmol/kg, P 〈 0.05) and a lower mean initial PCr resynthesis rate (18.1 ± 3.5 vs. 23.2 ± 6.0 mmol ⋅ kg −1 ⋅ min −1 , P 〈 0.05). After creatine supplementation, resting PCr increased 15% ( P 〈 0.05) in the young group and 30% ( P 〈 0.05) in the middle-aged group to 45.7 ± 7.5 vs. 45.7 ± 5.5 mmol/kg, respectively. Mean initial PCr resynthesis rate also increased in the middle-aged group ( P 〈 0.05) to a level not different from the young group (24.3 ± 3.8 vs. 24.2 ± 3.2 mmol ⋅ kg −1 ⋅ min −1 ). Time to exhaustion was increased in both groups combined after creatine supplementation (118 ± 34 vs. 154 ± 70 s, P 〈 0.05). In conclusion, creatine supplementation has a greater effect on PCr availability and resynthesis rate in middle-aged compared with younger persons.
Type of Medium:
Online Resource
ISSN:
8750-7587
,
1522-1601
DOI:
10.1152/jappl.1998.85.4.1349
Language:
English
Publisher:
American Physiological Society
Publication Date:
1998
detail.hit.zdb_id:
1404365-8
SSG:
12
SSG:
31
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