To investigate the effects of an uphill-marathon (43 km, 3063 m elevation gain) on running mechanics and neuromuscular fatigue in lower limb muscles.
Maximal mechanical power of lower limbs (MMP), temporal tensiomyography (TMG) parameters and muscle belly displacement (Dm) were determined in the vastus lateralis muscle before and after the competition in eighteen runners (age: 42.8±9.9 yr; body mass: 70.1±7.3 kg; maximal oxygen uptake: 55.5±7.5 mL·kg-1·min-1). Contact (tc) and aerial (ta) times, step frequency (f) and running velocity (v) were measured at 3,14,30 km and after the finish line (POST). Peak vertical ground reaction force (Fmax), vertical displacement of the centre of mass (Δz), leg length change (ΔL), vertical (kvert) and leg (kleg) stiffness were calculated.
MMP was inversely related with race time (r:-0.56,p:0.016), tc (r:-0.61,p:0.008), Δz (r:-0.57,p:0.012) and directly related with Fmax (r:0.59,p:0.010), ta (r:0.48,p:0.040), kvert (r:0.51,p:0.027). In the fastest sub-group (n:9) the following parameters were lower in POST (p<0.05) than at km 3: ta (-14.1±17.8%), Fmax (-6.2±6.4%), kvert (-17.5±17.2%), kleg (-11.4±10.9%). The slowest sub-group (n:9) showed changes (p<0.05) at km 30 and POST in Fmax (-5.5±4.9% and -5.3±4.1%), ta (-20.5±16.2% and -21.5±14.4%), tc (+5.5±7.5% and +3.2±5.2%), kvert (-14.0±12.8% and -11.8±10.0%), kleg (-8.9±11.5 and -11.9±12%). TMG temporal-parameters decreased in all runners (-27.35±18.0%,p<0.001), while Dm increased (+24.0±35.0%,p:0.005), showing lower muscle stiffness and higher muscle sensibility to the electrical stimulus.
Greater MMP was related with smaller changes in running biomechanics induced by fatigue. Thus, lower limb power training could improve running performance in uphill-marathons.
This research output has an Altmetric Attention Score of 4. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 03 June 2020.
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