From: External load profile during different sport-specific activities in semi-professional soccer players
External load indicators: metabolic indicators | |
 Metabolic Power | Metabolic Power (W · kg−1) was calculated by multiplying EC (in J · kg−1 · m−1) by running speed (v; in m · s−1) at any given moment (i.e., every 0.2 s): P met = EC · v. In order to assess metabolic power, considering the energy expenditure and derived, the equation developed by di Prampero et al. [67] established on previously studies by Minetti et al. [74] and Osgnach et al. [9] was adopted |
 Percentage of metabolic power | Percentage of metabolic power with intensity > 35 W (%W > 35W) |
 Number of intense actions per minute (n° int/min) | Number of intense actions per minute (n° int/min) The threshold considered to establish the intense actions was 20 W · kg−1 which represents the metabolic power when running at a constant speed of approximately 14.4 km · h−1 (high speed) on grass [9] |
 Distance per minute (dist/min) | Meters covered in a minute (m/min) |
 Passive Recovery time per minute | Passive Recovery time per minute (PrT/m) represents the sum of the seconds in a minute (for each minute) in which the player moves at a metabolic power between 0 and 5 W (i.e., 0–8 km/h) |
External load indicators: neuromuscular indicators | |
 Percentage of intense accelerations (%int acc) | This indicator represents the percentage of the number of accelerations > 2 m/s2 out of the total number of accelerations |
 Percentage of intense decelerations (%int dec) | In an opposite way to the previous one, this External load indicators indicates the percentage of the number of decelerations < -2 m/s2 out of the total number of decelerations |
 Change of directions per min > 30° (CdD/min > 30) | This External load indicators measure the number of change of directions higher than 30° per minute |