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We present a study of the star formation rate (SFR) for a sample of 16distant galaxies detected by ISOCAM at 15um in the CFRS0300+00 and CFRS1400+52fields. Their high quality and intermediate resolution VLT/FORS spectra haveallowed a proper correction of the Balmer emission lines from the underlyingabsorption. Extinction estimates using the Hbeta/Hgamma and the Halpha/HbetaBalmer decrement are in excellent agreement, providing a robust measurement ofthe instantaneous SFR based on the extinction-corrected Halpha luminosity. Starformation has also been estimated exploiting the correlations between IRluminosity and those at MIR and radio wavelengths. Our study shows that therelationship between the two SFR estimates follow two distinct regimes: (1) forgalaxies with SFRIR below ~ 100Msolar/yr, the SFR deduced from Halphameasurements is a good approximation of the global SFR and (2) for galaxiesnear of ULIRGs regime, corrected Halpha SFR understimated the SFR by a factorof 1.5 to 2. Our analyses suggest that heavily extincted regions completelyhidden in optical bands (such as those found in Arp 220) contribute to lessthan 20% of the global budget of star formation history up to z=1.Comment: (1) GEPI, Obs. Meudon, France ;(2) CEA-Saclay, France ;(3) ESO,  Gemany ;(4) IAC, Spain. To appear in A&

Star formation rates of distant luminous infrared galaxies derived from Hα and IR luminosities