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 Risk Assessment Risk Factors Safety Sex Characteristics

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• Keywords:
  Animal Studies Author Keywords: Exercise Testing Cumulative Trauma Cumulative Trauma Disorders Demographic Characteristics Human Muscle Injuries Laboratory Animals Muscle Power Muscles Muscular Disorders Musculoskeletal System Disorders Physiological Factors Repetitive Work Rest Periods Risk Factors Sex Factors

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• 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
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6e6b17d7a78762b0f3768f2b4f795102093971405afd95d737e460fb47426710c2fa56c3427c3fdac9f3ca36eb48e85933237d767cbfe1eae60643463d370fd1
• Download URL:
  https://stacks.cdc.gov/view/cdc/196253/cdc_196253_DS1.pdf
• File Type:
  [PDF - 394.07 KB ]