Precision of estimates of mean and peak spinal loads in lifting
A bootstrap procedure was used to determine the statistical precision of estimates of mean and peak spinal loads during lifting as function of the numbers of subjects and measurements per subject included in a biomechanical study. Data were derived from an experiment in which 10 subjects performed 3...
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| Veröffentlicht in: | Journal of biomechanics 2002-07, Vol.35 (7), p.979-982 |
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| container_title | Journal of biomechanics |
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| creator | van Dieën, Jaap H Hoozemans, Marco J.M van der Beek, Allard J Mullender, Margriet |
| description | A bootstrap procedure was used to determine the statistical precision of estimates of mean and peak spinal loads during lifting as function of the numbers of subjects and measurements per subject included in a biomechanical study. Data were derived from an experiment in which 10 subjects performed 360 lifting trials each. The maximum values per lift of the lumbar flexion angle, L5S1 sagittal plane moment, and L5S1 compression force were determined. From the data set thus compiled, 3000 samples were randomly drawn for each combination of number of subjects and number of measurements considered. The coefficients of variation of mean and peak (defined as mean plus 2 standard deviations) spinal loads across these samples were calculated. The coefficients of variation of the means of the three parameters of spinal load decreased as a linear function of the number of subjects to a power of about −0.48 and number of measurements to a power of about −0.06, while the corresponding powers for peak loads were about −0.44 and −0.11. |
| doi_str_mv | 10.1016/S0021-9290(02)00051-9 |
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Data were derived from an experiment in which 10 subjects performed 360 lifting trials each. The maximum values per lift of the lumbar flexion angle, L5S1 sagittal plane moment, and L5S1 compression force were determined. From the data set thus compiled, 3000 samples were randomly drawn for each combination of number of subjects and number of measurements considered. The coefficients of variation of mean and peak (defined as mean plus 2 standard deviations) spinal loads across these samples were calculated. The coefficients of variation of the means of the three parameters of spinal load decreased as a linear function of the number of subjects to a power of about −0.48 and number of measurements to a power of about −0.06, while the corresponding powers for peak loads were about −0.44 and −0.11.</description><identifier>ISSN: 0021-9290</identifier><identifier>EISSN: 1873-2380</identifier><identifier>DOI: 10.1016/S0021-9290(02)00051-9</identifier><identifier>PMID: 12052401</identifier><language>eng</language><publisher>United States: Elsevier Ltd</publisher><subject>Analysis of Variance ; Back load ; Biomechanical Phenomena ; Humans ; Lifting ; Low Back Pain - etiology ; Low Back Pain - physiopathology ; Male ; Power analysis ; Spine ; Spine - physiology ; Variability ; Weight-Bearing - physiology</subject><ispartof>Journal of biomechanics, 2002-07, Vol.35 (7), p.979-982</ispartof><rights>2002 Elsevier Science Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c424t-929f4fff8d906eaa20e6b21d1472f2225ff474e3dd6c6e2bb4537ae73f5c7b7a3</citedby><cites>FETCH-LOGICAL-c424t-929f4fff8d906eaa20e6b21d1472f2225ff474e3dd6c6e2bb4537ae73f5c7b7a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0021929002000519$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12052401$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>van Dieën, Jaap H</creatorcontrib><creatorcontrib>Hoozemans, Marco J.M</creatorcontrib><creatorcontrib>van der Beek, Allard J</creatorcontrib><creatorcontrib>Mullender, Margriet</creatorcontrib><title>Precision of estimates of mean and peak spinal loads in lifting</title><title>Journal of biomechanics</title><addtitle>J Biomech</addtitle><description>A bootstrap procedure was used to determine the statistical precision of estimates of mean and peak spinal loads during lifting as function of the numbers of subjects and measurements per subject included in a biomechanical study. Data were derived from an experiment in which 10 subjects performed 360 lifting trials each. The maximum values per lift of the lumbar flexion angle, L5S1 sagittal plane moment, and L5S1 compression force were determined. From the data set thus compiled, 3000 samples were randomly drawn for each combination of number of subjects and number of measurements considered. The coefficients of variation of mean and peak (defined as mean plus 2 standard deviations) spinal loads across these samples were calculated. The coefficients of variation of the means of the three parameters of spinal load decreased as a linear function of the number of subjects to a power of about −0.48 and number of measurements to a power of about −0.06, while the corresponding powers for peak loads were about −0.44 and −0.11.</description><subject>Analysis of Variance</subject><subject>Back load</subject><subject>Biomechanical Phenomena</subject><subject>Humans</subject><subject>Lifting</subject><subject>Low Back Pain - etiology</subject><subject>Low Back Pain - physiopathology</subject><subject>Male</subject><subject>Power analysis</subject><subject>Spine</subject><subject>Spine - physiology</subject><subject>Variability</subject><subject>Weight-Bearing - physiology</subject><issn>0021-9290</issn><issn>1873-2380</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkUtPwzAQhC0EoqXwE0A58TgE1o4dJ6cKVbykSiABZ8uJ18iQR4lTJP49TlvBjZ5WI327O5oh5JjCJQWaXj0DMBrnLIdzYBcAIILaIWOaySRmSQa7ZPyLjMiB9-8Bklzm-2REGQjGgY7J9KnD0nnXNlFrI_S9q3WPfhA16ibSjYkWqD8iv3CNrqKq1cZHrokqZ3vXvB2SPasrj0ebOSGvtzcvs_t4_nj3MLuexyVnvB9MWG6tzUwOKWrNANOCUUO5ZJYxJqzlkmNiTFqmyIqCi0RqlIkVpSykTibkbH130bWfy-BT1c6XWFW6wXbplZRUCOBJHsjT_0kq8wQythWkmcg4FVkAxRosu9b7Dq1adCGm7ltRUEMZalWGGpJWwNSqDDU4Odk8WBY1mr-tTfoBmK4BDMl9OeyULx02JRoXWumVad2WFz9Iipet</recordid><startdate>20020701</startdate><enddate>20020701</enddate><creator>van Dieën, Jaap H</creator><creator>Hoozemans, Marco J.M</creator><creator>van der Beek, Allard J</creator><creator>Mullender, Margriet</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QP</scope><scope>7TS</scope><scope>7X8</scope></search><sort><creationdate>20020701</creationdate><title>Precision of estimates of mean and peak spinal loads in lifting</title><author>van Dieën, Jaap H ; Hoozemans, Marco J.M ; van der Beek, Allard J ; Mullender, Margriet</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c424t-929f4fff8d906eaa20e6b21d1472f2225ff474e3dd6c6e2bb4537ae73f5c7b7a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Analysis of Variance</topic><topic>Back load</topic><topic>Biomechanical Phenomena</topic><topic>Humans</topic><topic>Lifting</topic><topic>Low Back Pain - etiology</topic><topic>Low Back Pain - physiopathology</topic><topic>Male</topic><topic>Power analysis</topic><topic>Spine</topic><topic>Spine - physiology</topic><topic>Variability</topic><topic>Weight-Bearing - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>van Dieën, Jaap H</creatorcontrib><creatorcontrib>Hoozemans, Marco J.M</creatorcontrib><creatorcontrib>van der Beek, Allard J</creatorcontrib><creatorcontrib>Mullender, Margriet</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Calcium & Calcified Tissue Abstracts</collection><collection>Physical Education Index</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of biomechanics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>van Dieën, Jaap H</au><au>Hoozemans, Marco J.M</au><au>van der Beek, Allard J</au><au>Mullender, Margriet</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Precision of estimates of mean and peak spinal loads in lifting</atitle><jtitle>Journal of biomechanics</jtitle><addtitle>J Biomech</addtitle><date>2002-07-01</date><risdate>2002</risdate><volume>35</volume><issue>7</issue><spage>979</spage><epage>982</epage><pages>979-982</pages><issn>0021-9290</issn><eissn>1873-2380</eissn><abstract>A bootstrap procedure was used to determine the statistical precision of estimates of mean and peak spinal loads during lifting as function of the numbers of subjects and measurements per subject included in a biomechanical study. Data were derived from an experiment in which 10 subjects performed 360 lifting trials each. The maximum values per lift of the lumbar flexion angle, L5S1 sagittal plane moment, and L5S1 compression force were determined. From the data set thus compiled, 3000 samples were randomly drawn for each combination of number of subjects and number of measurements considered. The coefficients of variation of mean and peak (defined as mean plus 2 standard deviations) spinal loads across these samples were calculated. The coefficients of variation of the means of the three parameters of spinal load decreased as a linear function of the number of subjects to a power of about −0.48 and number of measurements to a power of about −0.06, while the corresponding powers for peak loads were about −0.44 and −0.11.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><pmid>12052401</pmid><doi>10.1016/S0021-9290(02)00051-9</doi><tpages>4</tpages></addata></record> |
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| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Analysis of Variance Back load Biomechanical Phenomena Humans Lifting Low Back Pain - etiology Low Back Pain - physiopathology Male Power analysis Spine Spine - physiology Variability Weight-Bearing - physiology |
| title | Precision of estimates of mean and peak spinal loads in lifting |
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