L'uso della riserva di frequenza cardiaca per valutare l'intensità dell'esercizio durante allenamenti specifici nel calcio

Aim. The aim of the study was to verify whether the percentage of heart rate reserve (%HRR)is equivalent to the percentage of oxygen uptake reserve (%(V) over dotO(2R)) also during soccer-specific exercises characterized by intermittent pattern. Methods. Seven male amateur soccer players were involved in the study (age 25.3 +/- 1.2 yrs, body mass 72.9 +/- 2.1 kg, height 176.1 +/- 2.5 cm; mean +/- SD). They performed three trials on the field at increasing intensities (moderate, high and very high) of a soccer-specific endurance path and, on different day, an incremental test on a treadmill in the laboratory. Results. The mean slope (1.17 +/- 0.08) and intercept (-0.12 +/- 0.03) of %HRR versus% (V) over dotO(2R) relationship were not significantly different from the coefficient representing the line of identity (0 and 1, respectively; P<0.05). On the contrary, the mean slope (1.17 +/- 0.08) and intercept (-0.12 +/- 0.03) of %HRR versus %(V) over dotO(2)max, relationship were significantly different from 0 and 1, respectively (P<0.05). The slope and the intercept of the two regression lines were different (P<0.05). Conclusion. The results of the present study indicate that %HRR is equivalent to %(V) over dotO(2R), suggesting that the use of %HRR could be an accurate reference tool to characterize and prescribe exercise intensities during soccer activities.