The purpose of this study was to compare the effects of various dosages of light emitting diode therapy (LEDT) on muscle fatigue, while performing a single leg extension to exhaustion. 34 recreationally resistance trained athletes between the ages of 18 and 26 participated in four trials. Each trial included pre and post exercise blood lactate measurements, two sets of three maximal voluntary isometric contractions (MVIC), followed by LEDT on six points across the superficial quadriceps. Each randomized trial consisted of a placebo, 30 seconds, 60 seconds or 120 seconds on each point on the quadriceps. Three minutes after LEDT, the participants performed an eccentric leg extension with 120% of MVIC until fatigue. There was significant increase in the number of repetitions performed between the placebo treatment and 60 seconds (p= 0.023), as well as placebo and 120 seconds (p=0.004) of irradiation on each point. There was no significant between blood lactate levels between all four trials. Even though there were no differences found in blood lactate measurements, LEDT appears to have a positive effect on performance when irradiating six points on the superficial quadriceps for 60 seconds and 120 seconds prior to an eccentric leg extension.
","abstract_html":"<p>The purpose of this study was to compare the effects of various dosages of light emitting diode therapy (LEDT) on muscle fatigue, while performing a single leg extension to exhaustion. 34 recreationally resistance trained athletes between the ages of 18 and 26 participated in four trials. Each trial included pre and post exercise blood lactate measurements, two sets of three maximal voluntary isometric contractions (MVIC), followed by LEDT on six points across the superficial quadriceps. Each randomized trial consisted of a placebo, 30 seconds, 60 seconds or 120 seconds on each point on the quadriceps. Three minutes after LEDT, the participants performed an eccentric leg extension with 120% of MVIC until fatigue. There was significant increase in the number of repetitions performed between the placebo treatment and 60 seconds (p= 0.023), as well as placebo and 120 seconds (p=0.004) of irradiation on each point. There was no significant between blood lactate levels between all four trials. Even though there were no differences found in blood lactate measurements, LEDT appears to have a positive effect on performance when irradiating six points on the superficial quadriceps for 60 seconds and 120 seconds prior to an eccentric leg extension.</p>","abstract_has_math":false,"creators":["Hemmings, Thomas J"],"institution":null,"degree_name":"Master of Science in Kinesiology (M.S.)","degree_level":"Thesis (restricted to Georgia Southern)","degree_discipline":"Department of Health and Kinesiology","degree_department":null,"school":null,"contributors":["Jim McMillan","Stephen Rossi"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-01-01T08:00:00Z","date_published":"2015-01-01T08:00:00Z","updated_at":"2026-07-24T02:28:15Z","subjects":["ETD","Single-subject","Video","Motivational General-Mastery Imagery","Kinesiotherapy"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.georgiasouthern.edu/etd/1221","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Jim McMillan","Stephen Rossi"]},{"key":"dc:creator","label":"Author","values":["Hemmings, Thomas J"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2016-03-28T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Department of Health and Kinesiology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis (restricted to Georgia Southern)"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Kinesiology (M.S.)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["ETD","Single-subject","Video","Motivational General-Mastery Imagery","Kinesiotherapy"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.georgiasouthern.edu/etd/1221"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The purpose of this study was to compare the effects of various dosages of light emitting diode therapy (LEDT) on muscle fatigue, while performing a single leg extension to exhaustion. 34 recreationally resistance trained athletes between the ages of 18 and 26 participated in four trials. Each trial included pre and post exercise blood lactate measurements, two sets of three maximal voluntary isometric contractions (MVIC), followed by LEDT on six points across the superficial quadriceps. Each randomized trial consisted of a placebo, 30 seconds, 60 seconds or 120 seconds on each point on the quadriceps. Three minutes after LEDT, the participants performed an eccentric leg extension with 120% of MVIC until fatigue. There was significant increase in the number of repetitions performed between the placebo treatment and 60 seconds (p= 0.023), as well as placebo and 120 seconds (p=0.004) of irradiation on each point. There was no significant between blood lactate levels between all four trials. Even though there were no differences found in blood lactate measurements, LEDT appears to have a positive effect on performance when irradiating six points on the superficial quadriceps for 60 seconds and 120 seconds prior to an eccentric leg extension.
"]},{"key":"dc:title","label":"Title","values":["Identifying Dosage Effect of LEDT on Muscular Fatigue in Quadriceps"]}]}],"canonical_facts":{"dc:contributor":["Jim McMillan","Stephen Rossi"],"dc:creator":["Hemmings, Thomas J"],"dc:date.available":["2016-03-28T07:00:00Z"],"dc:description.abstract":["The purpose of this study was to compare the effects of various dosages of light emitting diode therapy (LEDT) on muscle fatigue, while performing a single leg extension to exhaustion. 34 recreationally resistance trained athletes between the ages of 18 and 26 participated in four trials. Each trial included pre and post exercise blood lactate measurements, two sets of three maximal voluntary isometric contractions (MVIC), followed by LEDT on six points across the superficial quadriceps. Each randomized trial consisted of a placebo, 30 seconds, 60 seconds or 120 seconds on each point on the quadriceps. Three minutes after LEDT, the participants performed an eccentric leg extension with 120% of MVIC until fatigue. There was significant increase in the number of repetitions performed between the placebo treatment and 60 seconds (p= 0.023), as well as placebo and 120 seconds (p=0.004) of irradiation on each point. There was no significant between blood lactate levels between all four trials. Even though there were no differences found in blood lactate measurements, LEDT appears to have a positive effect on performance when irradiating six points on the superficial quadriceps for 60 seconds and 120 seconds prior to an eccentric leg extension.
"],"dc:identifier":["https://digitalcommons.georgiasouthern.edu/etd/1221"],"dc:subject":["ETD","Single-subject","Video","Motivational General-Mastery Imagery","Kinesiotherapy"],"dc:title":["Identifying Dosage Effect of LEDT on Muscular Fatigue in Quadriceps"],"thesis:degree_discipline":["Department of Health and Kinesiology"],"thesis:degree_level":["Thesis (restricted to Georgia Southern)"],"thesis:degree_name":["Master of Science in Kinesiology (M.S.)"]},"updated_at":"2026-07-24T02:28:15Z"}