Effect of Volume Training on Back Endurance (Training)
Effect of Volume Training on Endurance of Trunk Extensor Muscles in Healthy Subjects: A Randomized Control Trial.
Przegląd badań
Szczegółowy opis
The purpose of this study is to compare an endurance trunk extensor training using one and three sets of exercise repetition on gains of strength and endurance muscular in healthy subjects.
Forty-two healthy voluntaries (from 18 to 35 years) of both the sexes will participate of this study. All participants will sign an informed consent form approved by the North of Parana University Ethics Committee for Research on Human Subjects. The sample will be randomized in three groups by the allocation from printed cards sequentially numbered in opaque envelopes: (G1, n=14) the participants will perform three sets of 15-20 repetitions of the trunk extensor exercise on a roman chair machine with the hips at 45 degrees relative to horizontal; performing trunk flexion-extension cycles for a total of 4 seconds (2 s concentric and 2 s eccentric contraction); (G2) the participants will perform only one set of 15-20 repetitions of the trunk extensor exercise on a roman chair machine with the hips at 45 degrees relative to horizontal; performing also trunk flexion-extension cycles for a total of 4 seconds (2 s concentric and 2 s eccentric); and (G3) the participants will be the control group, which not participating of any exercise program in any time during the study. A total of 10 weeks of training will be performed in the study, by 2 x week with the progression of load volume (increase the load if the total repetition of 20 is reached).
Before and after the lumbar training, all participants will be assessed by the endurance muscular (Isometric Sorensen test using time-limit, Dynamic endurance using the number of repetition, Borg fatigue perception scale and EMG surface of trunk extensor muscles by computation of median frequency fatigue estimate); and by the strength muscular (back isometric maximal voluntary contraction using a dynamometer on a roman chair). An evaluator trained will perform all testing assessment, in baseline time and after weeks of training. The evaluator will be blinded with regard the groups on assessment. Also, an exercise professional of sport will be responsible by exercise prescription to prescript the training at the Fitness center in the UNOPAR University; This professional will be also blinded to the groups.
An ANOVA two-way to compare the effects in the three groups (G1, G2, and G3) and the two times session-1: baseline and session-2: after 10 weeks); and the effects of interaction (Groups X Times) also will be tested. When necessary a Tukey post hoc analysis will be performed to localize the differences on the three groups. The effect size on each group will be calculated to determine the rate of changes from the training intervention.
Typ studiów
Zapisy (Rzeczywisty)
Faza
- Nie dotyczy
Kryteria uczestnictwa
Kryteria kwalifikacji
Wiek uprawniający do nauki
Akceptuje zdrowych ochotników
Płeć kwalifikująca się do nauki
Opis
Inclusion Criteria:
- Healthy subjects only and not using ergogenic substances and anabolic steroids, and drugs use for increasing ot the muscular performance.
- All subjects need to be voluntaries.
Exclusion Criteria:
- Any contraindication to physical exercise performance in accord with the American College of Sports Medicine Standard Position;
- Several spinal pathologies (fractures, tumors, and inflammation), nerve root disorders (disc herniation and ,spondylolisthesis with neurological compromise, spinal stenosis, and others), several cardiorespiratory diseases, previous back surgery or pregnancy;
- Mental or physical illnesses problems that interfere with the exercise;
- Any surgery in the spine in the last 6 months;
- Upper body mass (trunk, upper limbs and head) greater than 50% of the total strength of the trunk extensor muscles from first day the data collection.
- Subjects enrolled in any exercise program outside of the study.
Plan studiów
Jak projektuje się badanie?
Szczegóły projektu
- Główny cel: Leczenie
- Przydział: Randomizowane
- Model interwencyjny: Przydział równoległy
- Maskowanie: Pojedynczy
Broń i interwencje
Grupa uczestników / Arm |
Interwencja / Leczenie |
|---|---|
|
Eksperymentalny: G1-Three sets of exercise
G1 group - the participants will perform three sets of 15-20 repetitions of the trunk extensor exercise on a roman chair machine with the hips at 45 degrees relative to horizontal; performing trunk flexion-extension cycles for a total of 4 seconds (2 s concentric and 2 s eccentric contraction).
The relative load for initial training will be placed at 20% back maximal voluntary contraction (MVC) and will be progressive during the training.
The time session of training will be of 10 weeks.
|
The groups will perform the trunk extensor exercise on a roman chair by 2 x week, for a total of 10 weeks of training (20 sessions).
The load will be progressive and tested to each 14 days with regard to the number of repetition reached by the participant.
The exercise is safe and will be supervised by a health sport professional.
|
|
Eksperymentalny: G2-One set of exercise
G2 group - the participants will perform only one set of 15-20 repetitions of the trunk extensor exercise on a roman chair machine with the hips at 45 degrees relative to horizontal; performing trunk flexion-extension cycles for a total of 4 seconds (2 s concentric and 2 s eccentric contraction).
The relative load for initial training will be placed at 20% back maximal voluntary contraction (MVC) and will be progressive during the training.
The time session of training will be of 10 weeks.
|
The groups will perform the trunk extensor exercise on a roman chair by 2 x week, for a total of 10 weeks of training (20 sessions).
The load will be progressive and tested to each 14 days with regard to the number of repetition reached by the participant.
The exercise is safe and will be supervised by a health sport professional.
|
|
Brak interwencji: G3-Control
G3 group - the participants will be the control group, which not participating of exercise program in any time during the study.
|
Co mierzy badanie?
Podstawowe miary wyniku
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
|
Isometric endurance (Classic Sorensen test)
Ramy czasowe: 10 weeks
|
To determine the improve of endurance muscular, the time-limit in seconds will be computed from modified Sorensen test executed on a roman chair.
To measure the fatigue muscular, the participant would hold the unsupported trunk horizontally (Sorensen test).
|
10 weeks
|
Miary wyników drugorzędnych
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
|
Number of repetitions
Ramy czasowe: 10 weeks
|
To determine the improve of dynamic back endurance, a second test will be performed and the number of repetitions will be computed from trunk flexion-extension cycles executed on a roman chair (2 seconds of concentric and 2 seconds of eccentric contraction; by a total of 4 seconds for each cycle).
|
10 weeks
|
Inne miary wyników
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
|
EMG fatigue index
Ramy czasowe: 10 weeks
|
The slope of median frenquency (MF) from EMG surface signals of the trunk extensor muscles (EMG fatigue estimate) will computed before and after the training during the Soresen test.
|
10 weeks
|
|
Isometric strength (maximal voluntary contractio: MVC)
Ramy czasowe: 10 weeks
|
All subjects will perform a maximal voluntary contraction (MVC) before and after the training, on a roman chair adaptated by a load cell to calcule the maximal strength of the back muscles at the trunk horizontal position.
Three MVC will be computed and the best value will be used as outcome results.
|
10 weeks
|
Współpracownicy i badacze
Sponsor
Współpracownicy
Śledczy
- Dyrektor Studium: Rubens A DA SILVA, PhD, Universidade Norte do Paraná
Publikacje i pomocne linki
Publikacje ogólne
- da Silva RA, Lariviere C, Arsenault AB, Nadeau S, Plamondon A. Pelvic stabilization and semisitting position increase the specificity of back exercises. Med Sci Sports Exerc. 2009 Feb;41(2):435-43. doi: 10.1249/MSS.0b013e318188446a.
- Lariviere C, Da Silva RA, Arsenault AB, Nadeau S, Plamondon A, Vadeboncoeur R. Specificity of a back muscle roman chair exercise in healthy and back pain subjects. Med Sci Sports Exerc. 2011 Jan;43(1):157-64. doi: 10.1249/MSS.0b013e3181e96388.
- Verna JL, Mayer JM, Mooney V, Pierra EA, Robertson VL, Graves JE. Back extension endurance and strength: the effect of variable-angle roman chair exercise training. Spine (Phila Pa 1976). 2002 Aug 15;27(16):1772-7. doi: 10.1097/00007632-200208150-00016.
Daty zapisu na studia
Główne daty studiów
Rozpoczęcie studiów
Zakończenie podstawowe (Rzeczywisty)
Ukończenie studiów (Rzeczywisty)
Daty rejestracji na studia
Pierwszy przesłany
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy wysłany (Oszacować)
Aktualizacje rekordów badań
Ostatnia wysłana aktualizacja (Oszacować)
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia weryfikacja
Więcej informacji
Terminy związane z tym badaniem
Słowa kluczowe
Dodatkowe istotne warunki MeSH
Inne numery identyfikacyjne badania
- Unopar-Rubens-2
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