Treadmill Exercise Negatively Affects Visual Contribution to Static Postural Stability

Abstract

This study was undertaken to explore the nature of impaired postural stability following physical exercise. Nine healthy subjects (aged 24 +/- 3 years) were subjected to 30 min of treadmill walking or running on two separate occasions. Walking and running speeds (1.9 to 2.2 m/s) were chosen to induce equal energy expenditure. During treadmill exercise, kinematic analysis of head movement was performed. Prior to and immediately following exercise, postural sway was evaluated as mean velocity of centre of pressure (VCOP), measured on a force plate during 30 s quiet stance with eyes open or eyes closed. The results indicate that exercise increased two-dimensional postural sway by 9 - 19 % in eyes open, but not in the eyes closed condition. The deteriorating effect of exercise was both evident in the sagittal and in the frontal plane, although the effect on the former was slightly more transient. Post-exercise sway values were significantly higher after running than after walking. Kinematic analysis of head movement confirmed larger vertical displacement and acceleration pattern in running compared to walking. It is concluded that exercise of moderate intensity deteriorates visual contribution to postural stability. The effect is evident as an initial destabilisation in the sagittal direction and a less transient loss of latero-lateral stability. Running tends to disturb postural stability more than walking, possibly due to more excessive head movement and disturbance of vestibular and visual information centres.

Fatigue-Induced Balance Impairment in Young Soccer Players

“…For example, for the eyes-open bipedal stance, sway-path ratios (fatigue/rest) have been in the range of 1.2 to 2 15,17,22 ; our result was 1.46. Increases in COP velocity were between 1.22 and 3.73 16,18,21 ; our ratio was between 1.4 and 2.0, depending on the direction. Few authors have tested unipedal stance (which is of great interest in soccer players 14,21 ) but even in this case, postfatigue increases in amplitude of COP maximum displacement in the ML and AP directions and COP velocity were consistent with those we demonstrated.…”

“…Typical experiments aimed at assessing the effect of fatigue on static balance involve exercise such as the treadmill, [15][16][17] cycle or rowing ergometer, 14,15,18 isokinetic concentric actions, squat jumps, and heel raises. 14,19 A few authors 20,21 have evaluated the fatiguing effects of actual sport performance in triathletes 22 and soccer players.…”

Vliv zatížení na stabilitu stoje u juniorské reprezentace moderního pětiboje

“…Fencl (1979) píše o nejpodstatnější pohybové schopnosti při střelbě -jemné motorice končetin a senzomotorické koordinaci, Nitzsche (1988) a Paugschová (2000 o značné míře vlivu úrovně koordinač-ních schopností (koordinační znaky -preciznost určená rovnovážnou, diferenciační a reakční schopností) a rychlosti a Brych (1985) o speciální rychlosti a obratnosti zajišťující přesnost vykonávaných pohybů. Lepers et al (1997) zjistili, že po bežeckém zatížení dochází k výraznějšímu narušení stability stejně jako po jízdě na kole (Seliga et al, 1991) nebo chůzi (Derave et al, 2002). Navíc v případě běhu je tento vliv více znatelný při použití ergometru než při běhu v terénu (Hashiba, 1998).…”

“…Na negativní vliv fyzického zatížení na stabilitu stoje poukazuje něko-lik literárních zdrojů (Čech et al, 2010;Derave et al, 2002;Hoffman et al, 1992;Groslambert et al, 1998;Nardone et al, 1998;Tarantola et al, 1997). Někteří autoři prokazují zhoršení výkonu po zatížení, jiní poukazují jenom na nevýznamný rozdíl v indikátorech stability po zatížení ve srovnání se stabilitou v klidu.…”

Influence of Long-Lasting Balancing on Unstable Surface on Changes in Balance

“…It was sta ted that both tiredness [20,21,24] and hyperventilation [25] caused by an effort can have a negative influence on stability depending on its kind, intensity and dura tion. It was noted that running weakens the balance pa rameters much more than marching or cycling [26,27]. Shortlasting, suddenly done intensive work has a more negative impact on balance than an effort of an aerobic character, i.e.…”