HQCROSS: Hamstring/Quadriceps Ratio in CrossFit

Sponsor

Camila Velo Etcheverry (Other)

Overall Status

Not yet recruiting

CT.gov ID

NCT05500729

Collaborator

(none)

Enrollment

Location

3.9

Anticipated Duration (Months)

15.2

Patients Per Site Per Month

Study Details

Study Description

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.

Condition or Disease	Intervention/Treatment	Phase
Healthy Volunteers	Other: Hamstrings maximal voluntary isometric contraction. Other: Quadriceps maximal voluntary isometric contraction

Study Design

Study Type:

Observational

Anticipated Enrollment :

60 participants

Observational Model:

Cohort

Time Perspective:

Cross-Sectional

Official Title:

Evaluation of Isometric Strength and Hamstring/Quadriceps Ratio in Healthy CrossFit Subjects

Anticipated Study Start Date :

Aug 22, 2022

Anticipated Primary Completion Date :

Nov 1, 2022

Anticipated Study Completion Date :

Dec 20, 2022

Arms and Interventions

Arm	Intervention/Treatment
Female CrossFitters Crossfit practitioners born as female	Other: Hamstrings 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. Other: Quadriceps 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.
Male CrossFitters Crossfit practitioners born as male	Other: Hamstrings 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. Other: Quadriceps 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.

Arm

Intervention/Treatment

Female CrossFitters

Crossfit practitioners born as female

Other: Hamstrings 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.

Other: Quadriceps 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.

Male CrossFitters

Crossfit practitioners born as male

Other: Hamstrings maximal voluntary isometric contraction.

Other: Quadriceps maximal voluntary isometric contraction

Outcome Measures

Primary Outcome Measures

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 Outcome Measures

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.