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Validation of a single session protocol to determine the load-velocity profile and one-repetition maximum for the back squat exercise. <jats:italic toggle=\"yes\">J Strength Cond Res<\/jats:italic> 38(6): 1013\u20131018, 2024\u2014We investigated whether a single session of absolute incremental loading is valid to obtain the individual load-velocity profile (LVP) and 1 repetition maximum (1RM) for the free-weight parallel back squat. Twenty strength-trained male subjects completed 3 testing sessions, including a baseline 1RM session and 2 LVP sessions (LVP<jats:sub>rel<\/jats:sub> based on incremental relative loads and LVP<jats:sub>abs<\/jats:sub> based on absolute load increments until 1RM). The 1RM load was compared between the baseline and LVP<jats:sub>abs<\/jats:sub>. The load at zero velocity (load-axis intercept [L<jats:sub>0<\/jats:sub>]), maximal velocity capacity (velocity-axis intercept [V<jats:sub>0<\/jats:sub>]), slope, and area under the load-velocity relationship line (A<jats:sub>line<\/jats:sub>) were compared between the LVP<jats:sub>rel<\/jats:sub> and LVP<jats:sub>abs<\/jats:sub> using equivalence testing through 2 one-sided <jats:italic toggle=\"yes\">t<\/jats:italic>-tests. Measurement accuracy was calculated using the absolute percent error. The 1RM measured at baseline and LVP<jats:sub>abs<\/jats:sub> was equivalent and presented a low absolute percent error (1.2%). The following LVP parameters were equivalent between LVP<jats:sub>rel<\/jats:sub> and LVP<jats:sub>abs<\/jats:sub>: 1RM, L<jats:sub>0<\/jats:sub>, and A<jats:sub>line<\/jats:sub> because the mean difference between sessions was close to zero and the Bland-Altman limits of agreement (1RM:5.3 kg; L<jats:sub>0<\/jats:sub>:6.8 kg; A<jats:sub>line<\/jats:sub>: 9.5 kg\u00b7m<jats:sup>\u22121<\/jats:sup>\u00b7s<jats:sup>\u22121<\/jats:sup>) were contained within the a priori defined \u00b1 equivalent margins (5% for 1RM and L<jats:sub>0<\/jats:sub> and 10% for A<jats:sub>line<\/jats:sub>). The aforementioned variables presented a low absolute percent error. However, slope and V<jats:sub>0<\/jats:sub> were not equivalent between sessions. In conclusion, a single session of absolute incremental loading is a valid approach to obtain the L<jats:sub>0<\/jats:sub> and A<jats:sub>line<\/jats:sub> of the individual LVP and 1RM, and can be used to efficiently track the magnitude of neuromuscular adaptations throughout the training cycles for the free-weight back squat.<\/jats:p>","DOI":"10.1519\/jsc.0000000000004749","type":"journal-article","created":{"date-parts":[[2024,2,19]],"date-time":"2024-02-19T13:01:14Z","timestamp":1708347674000},"page":"1013-1018","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":12,"title":["Validation of a Single-Session Protocol to Determine the Load-Velocity Profile and One-Repetition Maximum for the Back Squat Exercise"],"prefix":"10.1519","volume":"38","author":[{"given":"Miguel","family":"Gomes","sequence":"first","affiliation":[{"name":"Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Lisbon, Portugal; and"},{"name":"CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Portugal"}]},{"given":"Afonso","family":"Fitas","sequence":"additional","affiliation":[{"name":"Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Lisbon, Portugal; and"}]},{"given":"Paulo","family":"Santos","sequence":"additional","affiliation":[{"name":"Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Lisbon, Portugal; and"}]},{"given":"Pedro","family":"Pezarat-Correia","sequence":"additional","affiliation":[{"name":"Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Lisbon, Portugal; and"},{"name":"CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Portugal"}]},{"given":"Goncalo V.","family":"Mendonca","sequence":"additional","affiliation":[{"name":"Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Lisbon, Portugal; and"},{"name":"CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz Quebrada, Dafundo, Portugal"}]}],"member":"276","published-online":{"date-parts":[[2024,2,20]]},"reference":[{"key":"R1-20250805","doi-asserted-by":"crossref","first-page":"1897","DOI":"10.1519\/JSC.0000000000001657","article-title":"Reliability and validity of the load-velocity relationship to predict the 1RM back squat","volume":"31","author":"Banyard","year":"2017","journal-title":"J Strength Cond Res"},{"key":"R2-20250805","doi-asserted-by":"crossref","first-page":"763","DOI":"10.1123\/ijspp.2017-0610","article-title":"The reliability of individualized load-velocity 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