alimentazione scopo plastico scopo energetico
TRANSCRIPT
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Alimentazione
• Scopo plastico
• Scopo energetico
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Energia
Fabbisogno energetico
Dispendio energetico
Kcal Unita’ di misura
Kj 1 Kcal = 4.18KJ
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Dispendio energetico
Metabolismo di Base (MB, 70%)
Termogenesi (10-15 %)
Attivita’ Fisica (AF, 15% - 3, 4 xMB)
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Metabolismo basale (MB) Dovuto alla massa magra (Kcal/h) Dipende da:
Costituzione corporea (ad es.: massa % relativa cervello, fegato, cuore, reni, muscolatura scheletrica)
Eta’, Accrescimento,
Maturazione sessuale, Gravidanza, Allattamento Fattori endocrini, Temperatura corporea, Clima Attività lavorativa e fisica.
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Valutazione del M.B
Metodo semplice : 24Kcal x peso corporeo (kg)
Calorimetria diretta Sistemi apertiCalorimetria indiretta Sistemi chiusi (spirometri)
1l O2 = 4.82 Kcal
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Termogenesi
Termogenesi indotta dagli alimenti : metabolismo dei nutrienti (>proteine)
Termogenesi indotta dal freddo : brivido
Termogenesi indotta : farmaci, ormoni,
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Valutazione del dispendio energetico Apporto degli alimenti
Metodo fattoriale (variabilita’ individuale)
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Bilancio Energetico
Fabbisogno E. = Dispendio E.
Sovrappeso (IMC >25)
Peso Corporeo Normopeso (18.5 <IMC<25)
Sottopeso (18.5 >IMC)
IMC (indice di massa corporea) : Peso corporeo (kg) Statura2 (m)
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Apporto energetico degli alimenti
Valore calorico degli alimenti (bomba calorimetrica)
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