Isotonic Dynamometry for the Assessment of Power and Fatigue in the Knee Extensor Muscles of Females

Details

• Personal Author:
  Barill ER ; Miller, G. Roger ; Stauber RE ; Stauber WT
• Description:
  Impairments in muscle power production and recovery following short-duration intense activity could lead to decreased performance and risk of injury. We developed a power test for the knee extensor muscles using torque-velocity testing and moderate isotonic loads. Twenty-eight female volunteers performed three maximal efforts at each of four isotonic loads (27.1, 40.6, 54.2 and 67.8 N. m). If the calculated regression line for the torque-velocity data had an r2 >/= 0.95 (i.e. an acceptable test), maximal power (408 +/- 56 W) was computed from the data. Immediately after torque-velocity testing, the subjects repeated maximal effort knee extensions with 33.9 N. m for three bouts of 15 repetitions with 15 s of rest to produce muscle fatigue, defined as a decrease in power output during isotonic exercise. After a 4 min rest, the torque-velocity test was repeated and power calculated (345 +/- 48 W). For the group, the recovery of maximal power after the fatigue protocol was 85%. The extremes were represented by one subject who recovered only 70% of her maximal power and another who recovered completely (>98%). Physiological differences in muscle power following repeated exercise could have an impact on the outcome of therapeutic interventions for sports injuries, fatigue syndromes and occupational over-use conditions. Description provided by NIOSH
• Subjects:
  • Animals
  • Behavior
  • Cumulative Trauma Disorders
  • Demography
  • Ergonomics
  • Fatigue
  • Laboratories
  • Musculoskeletal Diseases
  • Musculoskeletal System
  • Occupational Health
  More +
• Keywords:
  • Cumulative trauma
  • Cumulative trauma disorders
  • Laboratory animals
  • Muscular disorders
  • Musculoskeletal system disorders
  • Repetitive work
  • Muscles
  • Animal studies
  • Injuries
  • Behavior
  More +
• ISSN:
  0144-5979
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  225-233
• Volume:
  20
• Issue:
  3
• NIOSHTIC Number:
  nn:20024452
• Citation:
  Clin Physiol 2000 May; 20(3):225-233
• Contact Point Address:
  William T. Stauber, PhD, Department of Physiology, West Virginia University, PO Box 9229, Morgantown, WV 26506-9229, USA
• Federal Fiscal Year:
  2000
• NORA Priority Area:
  Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
• Performing Organization:
  West Virginia University, Morgantown, West Virginia
• Peer Reviewed:
  True
• Start Date:
  19920101
• Source Full Name:
  Clinical Physiology
• End Date:
  20050531
• Download URL:
  https://stacks.cdc.gov/view/cdc/196253/cdc_196253_DS1.pdf
• File Type:
  [PDF - 394.07 KB]
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6e6b17d7a78762b0f3768f2b4f795102093971405afd95d737e460fb47426710c2fa56c3427c3fdac9f3ca36eb48e85933237d767cbfe1eae60643463d370fd1