The effects of a high-intensity free-weight back-squat exercise protocol on postural stability in resistance-trained males

R. M. Thiele, E. C. Conchola, T. B. Palmer, J. M. DeFreitas, B. J. Thompson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The purpose of this study was to investigate the effects of a high-intensity free-weight back-squat exercise on postural stability characteristics in resistance-trained males. Eighteen college-aged (mean ± SD: age = 22.9 ± 2.9 years; height = 175.8 ± 6.4 cm; mass = 86.3 ± 9.3 kg), resistance-trained males performed postural stability testing before and after completing five sets of eight repetitions of back-squat exercises at 80% of one-repetition maximum. A commercial balance testing device was used to assess sway index at pre- and at 0, 5, 10, 15 and 20 min post-exercise. Each balance assessment consisted of four, 20-s static stance conditions: eyes-open firm surface, eyes-closed firm surface, eyes-open soft surface and eyes-closed soft surface. Sway index was greater (P = 0.001–0.020) at Post 0 than at all other time points. No differences (P > 0.05) were observed between any other time phases. Sway index was greater (P < 0.001) for eyes-closed soft surface than all other conditions. These findings revealed sway index for all conditions significantly increased following completion of the back-squat; however, sway index recovered within 5 min of exercise. Higher sway index values as a result of neuromuscular fatigue induced by a back-squat exercise may have performance and injury risk consequences to subsequent activities that rely on postural stability. However, these findings suggest balance impairments may recover in ~5 min following high-intensity lower body resistance exercise.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalJournal of Sports Sciences
Volume33
Issue number2
DOIs
StatePublished - Jan 20 2015

Keywords

  • balance
  • fatigue
  • posture
  • recovery
  • resistance exercise

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