A review of strength & endurance research in rock climbing Background Sport climbing is the branch of rock climbing involving routes protected by pre-placed anchor bolts. The explosion in popularity of sport climbing and organised competitions have prompted a significant rise in participation and standards in recent decades. The focus of this new discipline is the athletic and competitive aspects of movement on rock (Jones, 1991). Coupled with this has been the development of structured and sport specific training techniques among professional and amateur climbers alike (Goddard and Neumann, 1993; Morstad, 2000). Climbing is a physical activity involving repeated movements of the body against gravity by producing forces on the holds on the wall surface via the upper and lower limbs. A considerable movement technique and psychological performance element is also universally recognised in the climbing related literature. The rise in participation, training and organised competitions in climbing and well documented increases in the occurrence of climbing related soft tissue injuries underlines the importance of research which evaluates the physiology of climbing. The aim of this review is to critically evaluate the current literature concerning the physiological demands and determinants of performance in sport climbing. Particular focus will be given to the forearm, specifically the finger flexors, and the physiological characteristics and adaptations occurring in trained climbers, which confer increased forearm strength and endurance. Future research objectives will also be outlined within this specific area. Physiological demands of climbing Rock climbing involves moving over the wall surface supported by four limbs, described by Quaine et al. (1997) as “vertical quadrupedia” (Fig. 1). Early attempts by climbers to identify key aspects of performance on which to focus their training recognised that the centre of acute fatigue during climbing lay invariably in the upper limbs, especially the forearms (Hurn and Ingle, 1988; Goddard and Neumann, 1993). It was observed that in general, the difficulty of the climbing becomes greater when the wall angle becomes steeper and the holds (particularly handholds) become smaller and further apart. The apparent limitation of the forearm in climbing makes physiological sense given its comparatively small muscle mass, not anatomically designed to support forces comparable with body mass (or exceeding it to produce accelerations against gravity). Morstad (2000) (citing unpublished quantitative analyses) argued that even at wall angles 45 degrees beyond vertical, where the lower limb cannot support much of the body mass in the vertical direction, successful movements must be initiated using the lower limb and trunk in order to reduce peak forces required at the hand holds. Although there are few reports in the climbing related literature of significant lower body fatigue, there is anecdotal evidence that lower limb strength is an advantage on certain types of moves, particularly to maintain contact on the footholds on very overhanging rock (Morstad, 2000). Unfortunately, no studies have examined lower limb or core strength in trained climbers. Bouts of sport climbing last for several minutes with sustained periods of intermittent isometric contraction in the finger flexors. Schadle-Schardt (1998) observed mean climbing times of 4.5 minutes during indoor competition climbing. Thus, sport rock climbing must be considered an endurance event. Few studies have attempted to analyse the movement patterns associated with climbing. Billat et al. (1995) observed that upward movement during indoor climbing occurs intermittently. Video analysis revealed that 63% of the total climbing time was spent ascending (vertical displacement of the hips) and 37% was spent maintaining an ‘immobilized’ position (static equilibrium). In climbing, static equilibrium must be maintained at certain times in order to clip the rope into protection bolts, rest individual fatigued limbs and scan and reach for the next holds (Goddard and Neumann, 1993; Sagar, 2001). Schadle-Schardt (1998) measured mean contact times for the fingers on each hold in competition climbing of 10 seconds with 2.4 second rest periods in between holds (presumably spent reaching the next hold and replacing chalk on the hands).
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