Medicine and Health Sciences Commons^™

Muscle Fatigue During Maximal Eccentric-Only, Concentric-Only, And Eccentric-Concentric Bicep Curl Exercise With Automated Drop Setting, James L. Nuzzo, Matheus D. Pinto, Kazunori Nosaka

Research outputs 2022 to 2026

Connected adaptive resistance exercise (CARE) machines are new technology purported to adjust resistance exercise loads in response to muscle fatigue. The present study examined muscle fatigue (strength loss, fatigue perceptions) during maximal eccentric-only (ECCmax-only), concentric-only (CONmax-only), and coupled ECC-CON (ECCmax-CONmax) bicep curl exercise on a CARE machine. Eleven men and nine women completed the three protocols in separate sessions and in random order. All protocols included 4 sets of 20 maximal effort muscle contractions. Strength loss was calculated as Set 4 set end load minus Set 1 highest load. The CARE machine's algorithm adjusted resistances automatically, permitting continued maximal effort …

Muscle Strength And Activity In Men And Women Performing Maximal Effort Biceps Curl Exercise On A New Machine That Automates Eccentric Overload And Drop Setting, James L. Nuzzo, Matheus D. Pinto, Kazunori Nosaka

Research outputs 2022 to 2026

Purpose:

Connected adaptive resistance exercise (CARE) machines are new equipment purported to adjust resistances within and between repetitions to make eccentric (ECC) overload and drop sets more feasible. Here, we examined muscle strength, endurance, electromyographic activity (EMG), and perceptions of fatigue during unilateral bicep curl exercise with a CARE machine and dumbbells. We also tested for sex differences in muscle fatigability.

Methods:

Twelve men and nine women attempted 25 consecutive coupled maximal ECC – concentric (CON) repetitions (ECCmax – CONmax) on a CARE machine. Participants also completed a CON one repetition maximum (1RM) and repetitions-to-failure tests with 60 and 80 …