Abstract

Junkyard training involves heavy, cumbersome implements and nontraditional movement patterns for unique training of athletes. This study assessed the metabolic demands of pushing and pulling a 1,960-kg motor vehicle (MV) 400 m in an all-out maximal effort. Six male, strength-trained athletes (29 ± 5 years; 89 ± 12 kg) completed 3 sessions. Sessions 1 and 2 were randomly assigned and entailed either pushing or pulling the MV. Oxygen consumption ([latin capital V with dot above]O2) and heart rate (HR) were measured continuously. Blood lactate was sampled immediately prior to and 5 minutes after sessions 1 and 2. Vertical jump was assessed immediately prior to and after sessions 1 and 2. During session 3 a treadmill VO2max test was conducted. No significant differences (p > 0.05) in [latin capital V with dot above]O2, HR, or blood lactate occurred between pushing and pulling efforts. [latin capital V with dot above]O2 and HR peaked in the first 100 m, and from 100 m on, vehicle. [latin capital V with dot above]O2 and HR averaged 65% and 96% of treadmill maximum values VO2max = 50.3 ml[middle dot]kg-1[middle dot]min-1; HRmax = 194 b[middle dot]min-1). Blood lactate response from the push and pull averaged 15.6 mmol[middle dot]L-1, representing 131% of the maximal treadmill running value. Vertical jump decreased significantly pre to post in both conditions (mean = -10.1 cm, 17%). All subjects experienced dizziness and nausea. In conclusion, a 400-m MV push or pull is an exhausting training technique that requires a very high anaerobic energy output and should be considered an advanced form of training. Strength coaches must be aware of the ultra-high metabolic and neuromuscular stresses that can be imposed by this type of training and take these factors into consideration when plotting individualized training and recovery strategies. Verf.-Referat