Healthy Volunteers
Conditions
Keywords
Healthy Volunteers, Muscle Strength, Hamstring Muscles, Quadriceps Muscles, Young Adult, Isometric Contraction, Muscle Strength Dynamometer, Human physical conditioning
Brief summary
Crossfit® is a high-intensity physical training plan based on a program that includes exercises such as running, weight lifting and gymnastic movements. It focuses on the development of 10 physical qualities: strength, balance, cardiovascular and respiratory endurance, coordination, power, flexibility, agility, speed, precision and muscular endurance.Unfortunately, research on its effects is still at the beginning. The time of each session is one hour, which is divided into a warm-up of 10-30 minutes, strength training or skills, endurance work and finally a recovery phase, mobility and stretching. These types of exercises are incorporated into group training sessions called Workout of The Day (WOD). Muscular strength is the action produced by a muscle or muscle group against resistance. It is one of the fundamental physical qualities for activities of daily living. Digital isometric dynamometry is a tool to evaluate maximum voluntary isometric contraction (MVIC). Hamstring muscles are responsible for hip extension and knee flexion. Moreover, they are the main protectors against anterior knee subluxation due to their action in conjunction with the anterior cruciate ligament (ACL).The quadriceps is one of the largest and most powerful muscles of the human body. The ratio between hamstrings and quadriceps muscles has a strong correlation with lower limb injuries. This ratio, known as H:Q has proved to be the most reliable indicator to quantify a neuromuscular decompensation that causes an injury and, in addition, it is used as a prognostic indicator.
Interventions
OTHERHamstrings maximal voluntary isometric contraction.
Hamstrings maximal voluntary isometric contraction (MVIC) will be measured with an isometric dynamometer (3 reps x 5 sec work x 10 sec rest). The best rep will be used. Whenever the third one was the best, additional measurements will be taken until a decrease in torque will be obtained to determine the maximum.
OTHERQuadriceps maximal voluntary isometric contraction
Quadriceps maximal voluntary isometric contraction (MVIC) will be measured with an isometric dynamometer (3 reps x 5 sec work x 10 sec rest). The best rep will be used. Whenever the third one was the best, additional measurements will be taken until a decrease in torque will be obtained to determine the maximum.
Sponsors
Camila Velo Etcheverry
Study design
Observational model
COHORT
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
20 Years to 40 Years
Healthy volunteers
Yes
Inclusion criteria
* Regular members of Tuluka Fitness Palermo. * With at least 1 year of Crossfit training.
Exclusion criteria
* Subjects with a history of knee surgery. * Who have any type of musculoskeletal injury to the dominant lower limb. * Who suffer from neurological disorders.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Hamstrings maximal voluntary isometric contraction | Day 1 | Hamstrings force generated by the patient during a maximal voluntary isometric contraction, measured by an isometric dynamometer with load cell and computer interface. The best of the 3 repetitions will be considered. Whenever the third one is the best, additional measurements will be taken until a decrease in torque is obtained in order to determine the maximum. Unit: Newtons |
| Quadriceps maximal voluntary isometric contraction. | Day 1 | Quadriceps force generated by the patient during a maximal voluntary isometric contraction, measured by an isometric dynamometer with load cell and computer interface. The best of the 3 repetitions will be considered. Whenever the third one was the best, additional measurements will be taken until a decrease in torque is obtained in order to determine the maximum. Unit: Newtons |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Hamstring / Quadriceps Ratio | Day 1 | The ratio between hamstrings and quadriceps muscles has a strong correlation with lower limb injuries. This ratio, known as H:Q has proved to be the most reliable indicator to quantify a neuromuscular decompensation that causes an injury and, in addition, it is used as a prognostic indicator. Minimum value: -1 Maximum value: 1 A value below 0.6 indicates risk of injury. |
Countries
Argentina
Contacts
Primary ContactOscar Ronzio, DHSc PT
Outcome results
None listed