Wat vinden jullie van het onderstaande.
Na training met gewichten heeft het anabole metabolisme van spiercel tijd nodig om op gang te komen
Zou dit betekenen dat whey-eiwitten niet nodig zijn na de training en dat men zich moet focussen op koolhydrathen na de training? En dan een zeer goede bedtime/night shake zou moeten nemen?
Na training met gewichten heeft het anabole metabolisme van spiercel tijd nodig om op gang te komen
Time Course of Myogenic and Metabolic Gene Expression in Response to Acute Exercise in Human Skeletal Muscle.
Yang Y, Creer A, Jemiolo B, Trappe S.
Human Performance Laboratory, Ball State University, Muncie, IN, USA.
The aim of this study was to examine the time course activation of select myogenic (MRF4, Myf5, MyoD, myogenin) and metabolic (CD36, CPT1, HK II and PDK4) genes after an acute bout of resistance (RE) or run (RUN) exercise.
For RE, 6 subjects [25 +/- 4 yr (mean +/- SD), 74 +/- 14 kg, 1.71 +/- 0.11 m] performed 3 sets of 10 repetitions at 70% of 1 repetition maximum of bilateral knee extensions. For RUN, another 6 subjects (25 +/- 4 yr, 72 +/- 5 kg, 1.81 +/- 0.07 m, 63 +/- 8 ml(.)kg(-1.)min(-1)) performed a 30 min treadmill run at 75% of VO2max.
All subjects were physically active in their respective mode of exercise. Eight muscle biopsies were taken from the vastus lateralis of RE subjects and from the gastrocnemius of RUN subjects pre, immediate post (0) and 1, 2, 4, 8, 12 and 24 h post exercise.
RE increased mRNA of MRF4 (3.7- to 4.5-fold 2-4 h post), MyoD (5.8-fold 8 h post), myogenin (2.6- and 3.5-fold 8-12 h post), HKII (3.6- to 10.5-fold 2-12 h post) and PDK4 (14- to 26-fold 2-8 h post). There were no differences in Myf5, CD36 and CPT1 mRNA levels 0-24 h post RE. RUN increased mRNA of MyoD (5.0- to 8.0-fold), HKII (12- to 16-fold) and PDK4 (32- to 52-fold) at 8-12 h post exercise.
here were no differences in MRF4, Myf5, myogenin, CD36 and CPT1 mRNA levels 0-24 h post RUN. These data show that there is both a myogenic and metabolic gene induction with RE and RUN exercise. The timing of the gene induction is variable and generally peaks 4-8 h post exercise with all gene expression not significantly different from the pre exercise levels by 24 h post exercise.
These data provide basic information for the timing of human muscle biopsy samples for gene expression studies involving exercise.
Zou dit betekenen dat whey-eiwitten niet nodig zijn na de training en dat men zich moet focussen op koolhydrathen na de training? En dan een zeer goede bedtime/night shake zou moeten nemen?
