when does muscle hypertrophy occur?

[sports_rehabilitator]

Does anyone know any journal references or information regarding the length of time it takes to show an increase in size of a muscle when training?

 

[imported_dkm1987]

It depends on which study you are looking at and what exactly that study was looking at.
Rennie, writes in "CONTROL OF THE SIZE OF THE
HUMAN MUSCLE MASS"

Quote[/b] ]It may take 20 weeks of intense resistance exercise to increase muscle mass by 20%.

In
Abe T, Kojima K, Kearns CF, Yohena H, Fukuda J.
Whole body muscle hypertrophy from resistance training: distribution and total mass.
Br J Sports Med. 2003 Dec;37(6):543-5.

Quote[/b] ]Three young men trained three days a week for 16 weeks......The greatest absolute increases in muscle CSA were seen at the level of the shoulder, chest, upper thigh, and upper portion of the upper arm (fig 1A; subject A). Relative changes in muscle hypertrophy were greater at the level of the shoulder, chest, and upper portion of the upper arm (+25–40%) compared with the waist, hip, forearm, thigh, and lower leg (+10–20%) (fig 1B). The relative increase in muscle CSA of all three subjects was 26% at the shoulder (peak CSA level) and 18% and 9% at the mid-thigh and lower leg respectively.

In
Muscle hypertrophy, hormonal adaptations and strength development during
strength training in strength-trained and untrained men.
Ahtiainen JP, Pakarinen A, Alen M, Kraemer WJ, Hakkinen K.

Quote[/b] ]Hormonal and neuromuscular adaptations to strength training were studied in eight male strength athletes (SA) and eight non-strength athletes (NA). The experimental design comprised a 21-week strength-training period. Significant increases of 20.9% in maximal force and of 5.6% in muscle
CSA in NA during the 21-week strength training period were greater than those of 3.9% and -1.8% in SA, respectively.

In
Changes in muscle hypertrophy in women with periodized resistance training.
Kraemer WJ, Nindl BC, Ratamess NA, Gotshalk LA, Volek JS, Fleck SJ, Newton RU,
Hakkinen K.

PURPOSE: Adaptations of arm and thigh muscle hypertrophy to different long-term periodized resistance training programs and the influence of upper body
resistance training were examined. METHODS: Eighty-five untrained women (mean age = 23.1 +/- 3.5 yr) started in one of the following groups: total-body training [TP, N = 18 (3-8 RM training range) and TH, N = 21 (8-12 RM training
range)], upper-body training [UP, N = 21 (3-8 RM training range) and UH, N = 19, (8-12 RM training range)], or a control group (CON, N = 6). Training took place on three alternating days per week for 24 wk. Assessments of body composition,
muscular performance, and muscle cross-sectional area (CSA) via magnetic resonance imaging (MRI) were determined pretraining (T1), and after 12 (T2) and 24 wk (T3) of training. RESULTS: Arm CSA increased at T2 (approximately 11%) and
T3 (approximately 6%) in all training groups and thigh CSA increased at T2 (approximately 3%) and T3 (approximately 4.5%) only in TP and TH.

Bryan has said that a person reasonably can gain 7 Lbs in one HST cycle. (If I'm remembering correctly

) I tried to find that post but couldn't. I remember him also saying something about 60 to 100 Lbs and then Lyle bringing something to the table so Bryan corrected it to 60lbs. Can't remember if that was AAS or Natural.