Muscle fiber cross sectional area.

<p>Individual values (dotted lines) and mean values (solid lines) before (Pre) and after (Post) the intervention period for athletes adding strength training to their normal endurance training (<i>E+S</i>, left panel) and athletes performing normal endurance training only (<i>E</i>, right panel). Muscle fiber cross sectional area (CSA) for both type I muscle fibers and type II muscle fibers * Different from pre (p ˂ 0.05)</p

Stiffness, Young’s modulus and mean cross section area (CSA) of the patellar tendon.

<p>Stiffness, Young’s modulus and mean cross section area (CSA) of the patellar tendon.</p

Training loads used during the strength training intervention

<p>Training loads used during the strength training intervention</p

Capillarization.

<p>Individual values (open symbols) and mean values (solid squares) for athletes adding strength training to their normal endurance training (<i>E+S</i>) and athletes performing normal endurance training only (<i>E</i>). a: Percent change in capillaries around each muscle fiber (CAF) for both muscle fiber type I and muscle fiber type II for <i>E+S</i> and <i>E</i>. b: Percent change in capillaries related to fiber area (CAFA) for both muscle fiber type I and muscle fiber type II for <i>E+S</i> and <i>E</i>.</p

Data from the maximal oxygen consumption test.

<p>Data from the maximal oxygen consumption test.</p

Determinants of running performance and running performance.

<p>Individual values (dotted lines) and mean values (solid lines) before (Pre) and after (Post) the intervention period for athletes adding strength training to their normal endurance training (<i>E+S</i>) and athletes performing normal endurance training only (<i>E</i>). a: Body mass adjusted oxygen consumption at 10 km·h^-1. b: Running velocity at 3.5 mmol∙L^-1 [la^-] calculated during the blood lactate profile test. c: The fractional utilization of VO_2max during the 40 min all-out test. d: Running distance during the 40 min all-out test. * Different from pre (p ˂ 0.05).</p