Newsgroup: it.salute.alimentazione
Titolo: una dieta del 1960

Era del Prof. Pende, famoso endocrinologo,  (che la prescriveva a pazienti
in giovane età, preferibilmente maschi x max 2  settimane.) :
mattina: mezzo pompelmo e un uovo sodo-
metà  mattina: un bicchierino di marsala e un pezzetto di groviera-
metà pomeriggio: idem-
Pranzo e Cena: due etti di carne ai ferri, insalata condita con un
cucchiaino  d'olio.
Che ve ne sembra ? Può affrontarla chiunque, senza differenza di età e di
sesso purchè in buone condizioni fisiche ?
margherita

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Secondo me la puoi fare solo se sei giovane e non hai niente da fare.
Altrimenti ti voglio vedere fare la minima attivita' fisica o, peggio,
mentale con tutto quel popo' di carboidrati.  :-)))
byez
lsd

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mentale con tutto quel popo´ di carboidrati.  :-)))
A prescindere dal fatto che quella "dieta del 1960" è, parafrasando
Fantozzi, "una cagata pazzesca", questi qua si allenavano con meno di 20
grammi di carbo al giorno....io con un po' meno! [:-)]
Metabolism 1983 Aug;32(8):769-76
The human metabolic response to chronic ketosis without caloric restriction:
preservation of submaximal exercise capability with reduced carbohydrate
oxidation.
Phinney SD, Bistrian BR, Evans WJ, Gervino E, Blackburn GL.
To study the effect of chronic ketosis on exercise performance in
endurance-trained humans, five well-trained cyclists were fed a eucaloric
balanced diet (EBD) for one week providing 35-50 kcal/kg/d, 1.75 g
protein/kg/d and the remainder of kilocalories as two-thirds carbohydrate
(CHO) and one-third fat. This was followed by four weeks of a eucaloric
ketogenic diet (EKD), isocaloric and isonitrogenous with the EBD but
providing less than 20 g CHO daily. Both diets were appropriately
supplemented to meet the recommended daily allowances for vitamins and
minerals. Pedal ergometer testing of maximal oxygen uptake (VO2max) was
unchanged between the control week (EBD-1) and week 3 of the ketogenic diet
(EKD-3). The mean ergometer endurance time for continuous exercise to
exhaustion (ENDUR) at 62%-64% of VO2max was 147 minutes at EBD-1 and 151
minutes at EKD-4. The ENDUR steady-state RQ dropped from 0.83 to 0.72 (P
less than 0.01) from EBD-1 to EKD-4. In agreement with this were a
three-fold drop in glucose oxidation (from 15.1 to 5.1 mg/kg/min, P less
than 0.05) and a four-fold reduction in muscle glycogen use (0.61 to 0.13
mmol/kg/min, P less than 0.01). Neither clinical nor biochemical evidence of
hypoglycemia was observed during ENDUR at EKD-4. These results indicate that
aerobic endurance exercise by well-trained cyclists was not compromised by
four weeks of ketosis. This was accomplished by a dramatic physiologic
adaptation that conserved limited carbohydrate stores (both glucose and
muscle glycogen) and made fat the predominant muscle substrate at this
submaximal power level.
E più recentemente si è anche scoperto che una dieta "low-carb", nonostante
quello che ci raccontano gli incompetenti di turno che popolano le
trasmissioni TV, si può tradurre in un aumento delle prestazioni di
endurance (naturalmente non si tratta di uno studio isolato).
Eur J Appl Physiol Occup Physiol 1994;69(4):287-93
Enhanced endurance in trained cyclists during moderate intensity exercise
following 2 weeks adaptation to a high fat diet.
Lambert EV, Speechly DP, Dennis SC, Noakes TD.
Liberty Life Chair of Exercise and Sports Science, University of Cape Town
Medical School, Observatory, South Africa.
These studies investigated the effects of 2 weeks of either a high-fat
(HIGH-FAT: 70% fat, 7% CHO) or a high-carbohydrate (HIGH-CHO: 74% CHO, 12%
fat) diet on exercise performance in trained cyclists (n = 5) during
consecutive periods of cycle exercise including a Wingate test of muscle
power, cycle exercise to exhaustion at 85% of peak power output [90% maximal
oxygen uptake (VO2max), high-intensity exercise (HIE)] and 50% of peak power
output [60% VO2max, moderate intensity exercise (MIE)]. Exercise time to
exhaustion during HIE was not significantly different between trials: nor
were the rates of muscle glycogen utilization during HIE different between
trials, although starting muscle glycogen content was lower [68.1 (SEM 3.9)
vs 120.6 (SEM 3.8) mmol.kg-1 wet mass, P < 0.01] after the HIGH-FAT diet.
Despite a lower muscle glycogen content at the onset of MIE [32 (SEM 7) vs
73 (SEM 6) mmol.kg-1 wet mass, HIGH-FAT vs HIGH-CHO, P < 0.01], exercise
time to exhaustion during subsequent MIE was significantly longer after the
HIGH-FAT diet [79.7 (SEM 7.6) vs 42.5 (SEM 6.8) min, HIGH-FAT vs HIGH-CHO, P
< 0.01]. Enhanced endurance during MIE after the HIGH-FAT diet was
associated with a lower respiratory exchange ratio [0.87 (SEM 0.03) vs (SEM
0.02), P < 0.05], and a decreased rate of carbohydrate oxidation [1.41 (SEM
0.70) vs 2.23 (SEM 0.40) g CHO.min-1, P < 0.05].(ABSTRACT TRUNCATED AT 250
WORDS)
Ciao!!!
Massimo
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