Most running studies have considered level running (LR), yet the regulation of locomotor behaviour during uphill (UR) and downhill (DR) running is fundamental to increase our understanding of human locomotion. The purpose of this article was to review the existing literature regarding biomechanical, neuromuscular and physiological adaptations during graded running.
Relative to LR, UR is characterized by a higher step frequency, increased internal mechanical work, shorter swing/aerial phase duration, and greater duty factor, while DR is characterized by increased aerial time, reduced step frequency and decreased duty factor.
Grade also modifies foot strike patterns, with a progressive adoption of a mid- to fore-foot strike pattern during UR, and rear-foot strike patterns during DR. In UR, lower limb muscles perform a higher net mechanical work compared to LR and DR to increase the body’s potential energy.
In DR, energy dissipation is generally prevalent compared to energy generation. The increased demands for work as running incline increases are met by an increase in power output at all joints, particularly the hip.
This implies that UR requires greater muscular activity compared to LR and DR. Energy cost of running (C r) linearly increases with positive slope but C r of DR decreases until a minimum slope is reached at -20 %, after which C r increases again.
The effects of slope on biomechanics, muscle contraction patterns and physiological responses have important implications for injury prevention and success of athletes engaged in graded running competitions.
Sports Med. 2016 Aug 9. [Epub ahead of print] Biomechanics and Physiology of Uphill and Downhill Running. Vernillo G1,2,3, Giandolini M4,5, Edwards WB1, Morin JB6, Samozino P5, Horvais N4,5, Millet GY7. 1Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Dr NW, Calgary, AB, T2N 1N4, Canada. 2Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy. 3CeRiSM, Research Center for Sport, Mountain and Health, University of Verona, Rovereto, TN, Italy. 4Salomon SAS, Innovation and Sport Science Lab, 74996, Annecy, France. 5Laboratory of Exercise Physiology, University Savoie Mont Blanc, 73376, Le Bourget-du-Lac, France. 6Université Côte d’Azur, LAMHESS, Nice, France. 7Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Dr NW, Calgary, AB, T2N 1N4, Canada. firstname.lastname@example.org.