Mechanical external work and recovery at preferred walking speed in obese subjects

Davide Malatesta, Luca Vismara, Francesco Menegoni, Manuela Galli, Marianna Romei, Paolo Capodaglio

Research output: Contribution to journalArticle


PURPOSE: The aim of this study was to compare the mechanical external work (per kg) and pendular energy transduction at preferred walking speed (PWS) in obese versus normal body mass subjects to investigate whether obese adults adopt energy conserving gait mechanics. METHODS: The mechanical external work (W ext) and the fraction of mechanical energy recovered by the pendular mechanism (Rstep) were computed using kinematic data acquired by an optoelectronic system and were compared in 30 obese (OG; body mass index [BMI] = 39.6 ± 0.6 kg•m-2; 29.5 ± 1.3 yr) and 19 normal body mass adults (NG; BMI = 21.4 ± 0.5 kg•m-2; 31.2 ± 1.2 yr) walking at PWS. RESULTS: PWS was significantly lower in OG (1.18 ± 0.02 m•s-1) than in NG (1.33 ± 0.02 m•s-1; P = 0.001). There was no significant difference in Wext per unit mass between groups (OG: 0.36 ± 0.03 J•kg -1•m-1; NG: 0.31 ± 0.02 J•kg -1•m-1; P = 0.12). Rstep was significantly lower in OG (68.4% ± 2.0%) compared with NG (74.4% ± 1.0%; P = 0.01). In OG only, Wext per unit mass was positively correlated with PWS (r = 0.57; P <0.001). CONCLUSION: Obese adults do not appear to alter their gait to improve pendular energy transduction and may select slower PWS to reduce mechanical and metabolic work.

Original languageEnglish
Pages (from-to)426-434
Number of pages9
JournalMedicine and Science in Sports and Exercise
Issue number2
Publication statusPublished - Feb 2009


  • Biomechanics
  • Gait
  • Human locomotion
  • Inverted pendulum

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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