Relationship Between Speed of Performing Leg Extension With 30 RM Load and the Selected EMG Variables of Selected Quadricep Muscles

Background

As highlighted in the introduction section, the investigation of the effect of load or resistance of the exercise in relation to the speed of exercise on the EMG activity of muscles should be studied to efface the limitation associated with the conducted studies in the past(Matheson et al., 2001; Ribeiro et al., 2005). To facilitate the investigation, the duration of time taken to complete 30 repetitions of leg extension exercise with 30 RM of load and the value of 30 RM are used to develop two new criteria, namely Gross Load Speed of Movement (GLSM) and Relative Load Speed of Movement (RLSM). GLSM is a conjugation of load of movement and speed of movement because it uses 30 RM value which represents the gross load overcame by the selected muscles to execute the exercise for 30 repetition and it uses the duration of exercise (30 repetition with minimum possible time) which represents the speed with which the selected muscle overcame the gross load to perform the exercise as fast as possible. Similarly, RLSM uses duration of time of exercise but instead of 30 RM as gross load it uses relative load which is obtained by dividing the 30 RM with body weight. RLSM is analogous to the concept of relative muscle strength which is calculated by dividing the gross muscle strength with body weight (Manske, 2006). No studies are available in the same direction.