Background/aim: Many studies were shown the effect of type's recovery on

performance. Active recovery has been reported by some to promote greater

exercise capacity, while others have not confirmed these results. The aim of this

study was to determine the effect of three types of recovery during repeated

high-intensity endurance training on blood buffering capacity and H+

regulation. Design/method; the statistical population of this research was

physical education students studying at Tarbiat Moallem University of Tehran.

Ten students participated in this study. Each individual completed a special

questionnaire to be healthy during the study period. On subsequent days they

performed repeated high-intensity endurance test (RHIET).The RHIET

consist of four bouts about 2; 30 minutes. Recovery periods of 5minutes were

allowed between bouts. RHIET differed in the kind of activity performed during

the recovery periods; Gouging at 63% maximum heart rate, stretching exercises

and lying supine. A sample of 5CC blood artery obtained from each individual

immediately after the last recovery period. Blood sample were sent to the

laboratory for homology test. Their buffering capacity was measured by

assessment of the following parameters: PH, PCO2, BB, HCO3

-, BE, O2-sat.

The ANOVA Repeated-Measures was use to analyze the data by spss16.

Results; Significant differences were shown between the active recovery and

the stretching exercises recovery and between the inactive recovery and the

stretching exercises recovery on PH, BB and between active recovery and the

inactive recovery on O2-sat (P≤0/05). There were no significant differences

between the active, inactive and stretching exercises recovery on HCO3

-, PCO2

and BE (p≤0/05). Conclusion; Therefore, this study has show that the inactive

recovery improve buffering capacity compared to the stretching exercises and

the active recovery. This finding is agreement with research dating Argyris

(2004), DuPont (2004), Buchheit (2009) and in agreement with research dating

Dorado (2004). Nick Draper (2006), De Geus Bas (2007). Alveolar gas

exchange can therefore increase due to slower heart rate and slower breathing

rate. The kidneys removal H+ and reabsorption HCO3

-. The body's metabolism

becomes lower and producing metabolic is decrease. Temp whole body

(muscle, blood) is decrease; oxygen is combined with the hemoglobin strongly.

Hence, PH is increase and buffering capacity is improved.