| چکیده انگلیسی مقاله |
Purpose: The study aimed to compare the p hysiological and perceptual responses of two high intensity intermittent aerobic exercises (HIIE), i.e. the 15s/15s exercise and an exercise on the Hoff track (HTE) . Methods: In this within-subject repeated measures study, s even high-level soccer players (Age: 24.1± 4.5yr; Height: 175± 0.04cm; Body mass: 67.9± 9.0kg; % Body fat: 14.2± 2.4%) performed the two exercises with same total duration (25 minutes) in a randomized order : 1) a 15s/15s protocol at 120% of maximal aerobic speed (MAS) , and 2) HTE . Heart rate (HR) and oxygen uptake ( VO 2 ) were measured continuously throughout both exercises . The rating of perceived exertion (RPE) w as measured 15 min after the end of each exercise. Blood lactate concentration ([La]) was measured at rest before each exercise, between and at the end of each set. Results: The mean VO 2 during HTE was significantly higher than 15s/15s exercise (39.3±2.3 vs. 36.8±1.9 mL/min/kg , P <0.05. The total O 2 consumed was significantly higher ( P <0.05) during HTE (66.8±7.6 L) than during the 15s/15s (62.3±8.6 L). Blood lactate [La] after the first set of HTE was significantly higher than the 15s/15s (12.5±2.0 vs. 10.6±2.0 mmol/L , P <0.05). However, RPE provided by players suggested that the 15s/15s was more intense than the HTE (13±1.8 vs. 11.7±1.4, P <0.05). Conclusion: Our results demonstrate that VO 2 and [La] were higher during HTE than during the 15s/15s when matched with duration . However, HTE was perceived less intense than 15s/15s. Thus, the use of HTE appears as an effective alternative for fitness coaches to develop aerobic endurance in soccer players. Key Words: Football; Interval-Training; Aerobic Fitness; Rating of Perceived Exertion |
